java.net.SocketException: Connection reset by peer in setSocketOptions()
Dear All, I have an exception that is littering my catalina.out. I see about 7000 of these on a normal day (server handles about 25 requests per second). It is this precise stack trace always. I have some other exceptions, but this one is the main headache I have today. Tomcat 7.0.30 openjdk version 1.7.0_25 FreeBSD 9.1-STABLE My questions: 1) What might be causing this? 2) What other information do you need to help shed some light on this problem? 3) How can I found out if this is happening from specific IP addresses maybe? 4) Any queues that might be overflowing? I have acceptCount 1024 and kern.ipc.somaxconn 1024, which should be plenty, right? 5) Any other steps I can take to dive deeper? Aug 03, 2013 8:50:45 PM org.apache.tomcat.util.net.NioEndpoint setSocketOptions SEVERE: java.net.SocketException: Connection reset by peer at sun.nio.ch.Net.setIntOption0(Native Method) at sun.nio.ch.Net.setSocketOption(Net.java:373) at sun.nio.ch.SocketChannelImpl.setOption(SocketChannelImpl.java:189) at sun.nio.ch.SocketAdaptor.setBooleanOption(SocketAdaptor.java:290) at sun.nio.ch.SocketAdaptor.setTcpNoDelay(SocketAdaptor.java:325) at org.apache.tomcat.util.net.SocketProperties.setProperties(SocketProperties.java:199) at org.apache.tomcat.util.net.NioEndpoint.setSocketOptions(NioEndpoint.java:649) at org.apache.tomcat.util.net.NioEndpoint$Acceptor.run(NioEndpoint.java:802) at java.lang.Thread.run(Thread.java:724) -- Kees Jan http://java-monitor.com/ kjkos...@kjkoster.org +31651838192 Repairing cannot be completed, you can only stop doing it. -- Belarusian proverb - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Connection reset by peer in org.apache.tomcat.util.net.NioEndpoint setSocketOptions
Dear All, I get these errors in the logs quite frequently. About 1500 times every day. The application works nicely, strangely enough. What is happening here? How can I resolve these error messages? Should I worry? Jun 10, 2012 4:43:17 PM org.apache.tomcat.util.net.NioEndpoint setSocketOptions SEVERE: java.net.SocketException: Connection reset by peer at sun.nio.ch.Net.setIntOption0(Native Method) at sun.nio.ch.Net.setIntOption(Net.java:154) at sun.nio.ch.SocketChannelImpl$1.setInt(SocketChannelImpl.java:406) at sun.nio.ch.SocketOptsImpl.setBoolean(SocketOptsImpl.java:38) at sun.nio.ch.SocketOptsImpl$IP$TCP.noDelay(SocketOptsImpl.java:284) at sun.nio.ch.OptionAdaptor.setTcpNoDelay(OptionAdaptor.java:48) at sun.nio.ch.SocketAdaptor.setTcpNoDelay(SocketAdaptor.java:268) at org.apache.tomcat.util.net.SocketProperties.setProperties(SocketProperties.java:183) at org.apache.tomcat.util.net.NioEndpoint.setSocketOptions(NioEndpoint.java:1090) at org.apache.tomcat.util.net.NioEndpoint$Acceptor.run(NioEndpoint.java:1317) at java.lang.Thread.run(Thread.java:619) Tomcat 6.0.26 on FreeBSD 9.0-STABLE. # /usr/local/jdk1.6.0/bin/java -version java version 1.6.0_03-p4 Java(TM) SE Runtime Environment (build 1.6.0_03-p4-kjkoster_30_nov_2011_10_57-b00) Java HotSpot(TM) 64-Bit Server VM (build 1.6.0_03-p4-kjkoster_30_nov_2011_10_57-b00, mixed mode) # _ -- Kees Jan http://java-monitor.com/ kjkos...@kjkoster.org +31651838192 Human beings make life so interesting. Do you know that in a universe so full of wonders, they have managed to invent boredom. Quite astonishing... -- Terry Pratchett - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
[solved] Re: connection reset errors
Dear All, Well, I managed to track this down. As it turned out, the problem was that I had a rather short TCP listen queue on the Tomcat connector port (100 elements) and that queue was overflowing. The solution was to 1) set acceptCount to a higher value in Tomcat and 2) to configure my OS to allow applications to specify longer accept queues. That last step was the one missing. I had changed acceptCount before, but since the OS was limiting the accept queue length I did not see any improvement. More details can be found here: http://java-monitor.com/forum/showthread.php?t=2492 A big thank you for all that contributed to this thread and helped me understand the problem. Kees Jan On 22 May 2012, at 14:45, André Warnier wrote: Kees Jan Koster wrote: Dear André, Assuming that your client is really connecting to that HTTP connector on port 8080 mentioned above.. Yes, it has a forwarded port 80 (using FreeBSD ipfw) that also points to 8080, and there is an Apache with mod_proxy_http that hooks into 8081. My tests are on the vanilla port, though. Can you be a bit clearer on this part ? Do you see the problem happening for 1 in 10 posts, when your client connects directly to Tomcat's HTTP port 8080 ? Or is it only when the client connects to Tomcat via either one of these intermediate pieces of machinery ? 1) You are getting a java.net.SocketException: Connection reset at java.net.SocketInputStream.read(SocketInputStream.java:168) so this appears to happen when/while your java client is reading the response from the server, and it appears to be that the client is expecting to be able to read more data, but finds itself unable to, because the socket has been closed under his nose. The reading is one area I need to look into: did the client get all data, partial data or none at all. I need to experiment with that. You say that it happens frequently, so it's not always. Indeed, not always. About 1 in 10 posts die like this on bad days. Sometimes hours with no issues. No pattern I can discern. 2) the server itself seems unaware that there is a problem. So it has already written the whole response back to the client, decided it was done with this request, and gone happily to handle other things. Precisely. That can happen, even if the client has not yet received all data, because between the server and the client there is a lot of piping, and the data may buffered at various levels or still in transit. thus.. - either the client is misinterpreting the amount of data that it should be reading from the server's response (trying to read more than there actually is) (on the other hand, I think that the kind of exception you would get in that case would be different, more like trying to read beyond EOF or so). - or something in-between the server and the client closes the connection before all data has been returned to the client (and/or is loosing data). It would be helpful to know if this happens when the response is particularly large, or small, or if it is unrelated to the response size. The response is a few bytes. I think it is about 10-20 bytes. Less than a packet, I expect. :) That is quite strange, I think. See below. If the server is configured with an AccessLogValve, you should be able to see how big the response was, in bytes. If you have control over the client code, you should be able to add something that logs how many bytes it has read before the exception occurs. What makes the request size interesting? What previous experience are you basing this question on? Just that intuitively, if a problem happens while reading the response, one would expect that the larger the response is, the more likely that some network issue would show up in the middle. But now that I say this, going back to your initial message and the stacktrace in it, I see .. at sun.net.www.http.HttpClient.parseHTTPHeader ... so the problem seems to show up right away, while the response's HTTP *headers* are being read. So it looks like when the problem happens, the client is not able to read anything at all, not even the headers.. Do all problems show up the same stacktrace, all with a problem while reading/parsing the response headers ? Dumping the response HTTP headers to the client logfile would also help finding out what happens. (If the client is an applet running inside of a browser, then a browser add-on would show this easily (like Live HTTP Headers for Firefox, or Fiddler2 for IE)). I can check that I see the same problems from a browser using firebug, that is a good idea. Thanks. Doing a traceroute from the client to the server, may also give an idea of what there is actually between the server and the client. mtr reports no packet loss between the two machines I used for testing. Actually, I was more thinking about some intermediate problematic proxy or something
Re: connection reset errors
Dear André, Took me a while to answer, because I wanted to get more precise readings. Assuming that your client is really connecting to that HTTP connector on port 8080 mentioned above.. Yes, it has a forwarded port 80 (using FreeBSD ipfw) that also points to 8080, and there is an Apache with mod_proxy_http that hooks into 8081. My tests are on the vanilla port, though. Can you be a bit clearer on this part ? Do you see the problem happening for 1 in 10 posts, when your client connects directly to Tomcat's HTTP port 8080 ? Or is it only when the client connects to Tomcat via either one of these intermediate pieces of machinery ? I re-ran my tests, making sure that I was positive about the path the packets travel. Here is what I fished out of the log of a client app running on the same machine as the server: java.net.SocketException: Connection reset by peer at java.net.PlainSocketImpl.socketSetOption(Native Method) at java.net.AbstractPlainSocketImpl.setOption(AbstractPlainSocketImpl.java:267) at java.net.Socket.setTcpNoDelay(Socket.java:940) at sun.net.www.http.HttpClient.openServer(HttpClient.java:400) at sun.net.www.http.HttpClient.openServer(HttpClient.java:483) at sun.net.www.http.HttpClient.init(HttpClient.java:213) at sun.net.www.http.HttpClient.New(HttpClient.java:300) at sun.net.www.http.HttpClient.New(HttpClient.java:316) at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:992) at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:971) at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:846) at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1087) This particular client connects on the same machine as the Tomcat server, using port 8080 (the configured HTTP connector for this Tomcat server). The URL used is http://localhost:8080/webapp. So whatever is happening, it is not happening on the network or in the ISP's hardware. It seems to be local to my machine and with this I feel that Tomcat is a suspect again. This goes against some of the things I said earlier. I was wrong, sorry. Is there any way to overwhelm a Tomcat connector without it serving 503 responses? This particular connector is maxed out at 256 connections, with about 5% actually busy at any given time (as reported by JMX), with spikes of up to 50% busy every hour or so. Another thing : your client is effectively requesting non-keepalive connections, so Tomcat will close the connection after sending the response to each request. And your clients have to rebuild a new connection for each request. If the same client(s) make lots of small requests one after another, this may be counter-productive, because each connection build-up requires several packets going back and forth. Also, on the server side, when a connection is being closed, it will nevertheless linger for a while in CLOSE_WAIT state, waiting for the client's TCP stack to acknowledge the CLOSE. I have seen cases where a large number of such connections being in CLOSE_WAIT triggered bizarre issues, such as a server becoming unable to accept new TCP connections for a while. I know this, but since I know the traffic pattern (connections are used once per minute) I opted to make the connections non-keep-alive from the client side. That way, the connections that come from browsers can make use of keep-alive for performance. I guess I should have gone for a model where I have a non-keel-alive HTTP connector on Tomcat for the clients and another keep-alive-enabled connector for the browser traffic. Hmmm. It may not be too late for that, but first I'd like some proof this is an issue. :) It may be worth checking how many of such CLOSE_WAIT connections you have over time, and if this relates to when the problems happen. netstat -pan | grep CLOSE_WAIT would show this. If more than a couple of hundreds show up, I'd become suspicious of something like that. I now graph these in Munin and I see spikes of up to 100 sockets in that state. You say hundreds are a problem, what about one hundred? -- Kees Jan http://java-monitor.com/ kjkos...@kjkoster.org +31651838192 Repairing cannot be completed, you can only stop doing it. -- Belarusian proverb - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
connection reset errors
Dear Tomcat community, I am trying to resolve the problem where some client code in Java frequently gets the following error in the logs: java.net.SocketException: Connection reset at java.net.SocketInputStream.read(SocketInputStream.java:168) at java.io.BufferedInputStream.fill(BufferedInputStream.java:218) at java.io.BufferedInputStream.read1(BufferedInputStream.java:258) at java.io.BufferedInputStream.read(BufferedInputStream.java:317) at sun.net.www.http.HttpClient.parseHTTPHeader(HttpClient.java:687) at sun.net.www.http.HttpClient.parseHTTP(HttpClient.java:632) at sun.net.www.http.HttpClient.parseHTTP(HttpClient.java:652) at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1000) ... The client code performs a simple HTTP POST request to a Tomcat server (FreeBSD 9.0-STABLE, Java 1.6.0_03, Tomcat 6.0.26). Below is the HTTP connector from server.xml: Connector port=8080 protocol=HTTP/1.1 connectionTimeout=1 enableLookups=false compression=on maxThreads=256 bufferSize=9000 / Tracing the servlet in Tomcat shows that the servlet's doPost() method returns normally and does not show any exceptions (I catch and log Throwable and nothing related is logged). Tracing on an application level shows the posted data to be in the database, as would be for a normal POST. The data is correct. Of note is that the response time of the post is the same as for a successful post. Under normal circumstances Tomcat processes a post in about 25ms, measured in the client. When I get this exception, the response time is also about that time. I think therefore that I am not timing out anywhere (or the response time would be a lot longer). First question: It says Connection reset and not Connection reset by peer. What is the difference between the two? I am told that one means a local reset and the other means a remote reset. Where can I find more about this difference? Second question: how do I analyze such resets? How do I find out who reset the connection and why? How can I replay this in such a way that I can see that? -- Kees Jan http://java-monitor.com/ kjkos...@kjkoster.org +31651838192 Change is good. Granted, it is good in retrospect, but change is good. - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: connection reset errors
Dear Jose,
2012/5/22 Kees Jan Koster kjkos...@gmail.com:
Dear Tomcat community,
I am trying to resolve the problem where some client code in Java frequently
gets the following error in the logs:
java.net.SocketException: Connection reset
at java.net.SocketInputStream.read(SocketInputStream.java:168)
at java.io.BufferedInputStream.fill(BufferedInputStream.java:218)
at java.io.BufferedInputStream.read1(BufferedInputStream.java:258)
at java.io.BufferedInputStream.read(BufferedInputStream.java:317)
at sun.net.www.http.HttpClient.parseHTTPHeader(HttpClient.java:687)
at sun.net.www.http.HttpClient.parseHTTP(HttpClient.java:632)
at sun.net.www.http.HttpClient.parseHTTP(HttpClient.java:652)
at
sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1000)
...
Are you calling to disconnect() method ?
Yes I am. In finally{} block. Here is the client code:
private Properties push(final Properties request) throws IOException {
HttpURLConnection connection = null;
PrintStream out = null;
InputStream in = null;
try {
connection = (HttpURLConnection) pushUrl.openConnection(proxy);
connection.setRequestMethod(POST);
connection.setDoOutput(true);
connection.setConnectTimeout(TWO_MINUTES);
connection.setReadTimeout(TWO_MINUTES);
connection.setRequestProperty(Connection, close);
out = new PrintStream(connection.getOutputStream());
request.storeToXML(out, null);
out.flush();
in = connection.getInputStream();
final Properties response = new Properties();
response.loadFromXML(in);
return response;
} finally {
if (in != null) {
try {
in.close();
} catch (Exception e) {
// ignore...
}
}
if (out != null) {
try {
out.close();
} catch (Exception e) {
// ignore...
}
}
if (connection != null) {
try {
connection.disconnect();
} catch (Exception e) {
// ignore...
}
}
}
}
}
--
Kees Jan
http://java-monitor.com/
kjkos...@kjkoster.org
+31651838192
Human beings make life so interesting. Do you know that in a universe so full
of wonders,
they have managed to invent boredom. Quite astonishing... -- Terry Pratchett
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Re: connection reset errors
Dear Jose,
Yes I am. In finally{} block. Here is the client code:
Calling the disconnect() method of HttpURLConnection may close the
underlying socket
if a persistent connection is otherwise idle at that time
Try don't call it, test it and tell us :-)
http://docs.oracle.com/javase/1.5.0/docs/guide/net/http-keepalive.html
Ugh. I never realized the socket API was this messy.
At any rate, I call connection.setRequestProperty(Connection, close); to
indicate that I do not want to make use of persistent connections. You can see
that in my client code.
If the underlying socket were closed I would also occasionally see other
methods than 'read' get an error. The stack trace I posted is the only one I
get, though.
--
Kees Jan
http://java-monitor.com/
kjkos...@kjkoster.org
+31651838192
Change is good. Granted, it is good in retrospect, but change is good.
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Re: connection reset errors
Dear André, Assuming that your client is really connecting to that HTTP connector on port 8080 mentioned above.. Yes, it has a forwarded port 80 (using FreeBSD ipfw) that also points to 8080, and there is an Apache with mod_proxy_http that hooks into 8081. My tests are on the vanilla port, though. 1) You are getting a java.net.SocketException: Connection reset at java.net.SocketInputStream.read(SocketInputStream.java:168) so this appears to happen when/while your java client is reading the response from the server, and it appears to be that the client is expecting to be able to read more data, but finds itself unable to, because the socket has been closed under his nose. The reading is one area I need to look into: did the client get all data, partial data or none at all. I need to experiment with that. You say that it happens frequently, so it's not always. Indeed, not always. About 1 in 10 posts die like this on bad days. Sometimes hours with no issues. No pattern I can discern. 2) the server itself seems unaware that there is a problem. So it has already written the whole response back to the client, decided it was done with this request, and gone happily to handle other things. Precisely. That can happen, even if the client has not yet received all data, because between the server and the client there is a lot of piping, and the data may buffered at various levels or still in transit. thus.. - either the client is misinterpreting the amount of data that it should be reading from the server's response (trying to read more than there actually is) (on the other hand, I think that the kind of exception you would get in that case would be different, more like trying to read beyond EOF or so). - or something in-between the server and the client closes the connection before all data has been returned to the client (and/or is loosing data). It would be helpful to know if this happens when the response is particularly large, or small, or if it is unrelated to the response size. The response is a few bytes. I think it is about 10-20 bytes. Less than a packet, I expect. :) If the server is configured with an AccessLogValve, you should be able to see how big the response was, in bytes. If you have control over the client code, you should be able to add something that logs how many bytes it has read before the exception occurs. What makes the request size interesting? What previous experience are you basing this question on? Dumping the response HTTP headers to the client logfile would also help finding out what happens. (If the client is an applet running inside of a browser, then a browser add-on would show this easily (like Live HTTP Headers for Firefox, or Fiddler2 for IE)). I can check that I see the same problems from a browser using firebug, that is a good idea. Thanks. Doing a traceroute from the client to the server, may also give an idea of what there is actually between the server and the client. mtr reports no packet loss between the two machines I used for testing. And if this all still does not provide any clues, then you're down to a network packet trace, using Wireshark or similar. Packet traces I was hoping to avoid. :( -- Kees Jan http://java-monitor.com/ kjkos...@kjkoster.org +31651838192 The secret of success lies in the stability of the goal. -- Benjamin Disraeli - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: [OT] Inspecting JMX
Dear Chris, Should I just give up and use JmxRemoteLifecycleListener? Yes. You really aren't get to get anywhere on EC2 without it. I figured since I was using localhost everything would stay there anyway. I'll give JmxRemoteLifecycleListener a chance. Or you could write a small piece of code that lives inside your app and writes the monitoring data into the Nagios queue directly. It is a simple text-based protocol. -- Kees Jan http://java-monitor.com/ kjkos...@kjkoster.org +31651838192 Human beings make life so interesting. Do you know that in a universe so full of wonders, they have managed to invent boredom. Quite astonishing... -- Terry Pratchett - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: TC7 + AntCompiler problems with whitespace in pathname
Dear all, Now about whether this is a bug in Tomcat or its documentation : I am fairly sure that not long ago, I saw a strong warning somewhere in the on-line Tomcat documentation, about not using spaces in pathnames somewhere, as it was not supported by some component. Perhaps the Tomcat start script can issue a warning in case spaces are found in the path? Kees Jan - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: [OT] TC7 + AntCompiler problems with whitespace in pathname
On 17 jan. 2012, at 11:11, André Warnier a...@ice-sa.com wrote: Kees Jan Koster wrote: Dear all, Now about whether this is a bug in Tomcat or its documentation : I am fairly sure that not long ago, I saw a strong warning somewhere in the on-line Tomcat documentation, about not using spaces in pathnames somewhere, as it was not supported by some component. Perhaps the Tomcat start script can issue a warning in case spaces are found in the path? You know, I think that this is a lost battle. The habit is by now so entrenched that there is probably nothing anyone can do by now to extirpate this, other than designing a new OS where this is forbidden. And you'd still have to deal with funny imported foreign file names and paths. But I keep on reacting to issues to do with withespace in pathnames, just because I believe that there is not one programmer alive in the whole world, who has not had some problem with this at some point. So if you can save yourself the trouble, by installing Tomcat in some pathname which makes sense and is not a pain to type and forget to quote somewhere, you'll always do yourself a favor in the end. P.S. In our current globalised world, similar issues exist with filenames containing characters that can perhaps be displayed everywhere, but not /typed/ on Agreed on the lost battle part. My suggestion is merely to help people who never experienced path issues like this before. It gives them a place to start looking when tomcat does not work for them. That is why I suggest to issue a warning and not rewrite the OS. Kees Jan - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: Tomcat HTTPS Connector Stops working after an hour
On 27 dec. 2011, at 06:25, Saravanan L saravan...@te-soft.com wrote: Please find the server.xml attached. The real problem is I dont know where to look at. -There are no error in logs or the linux sys logs. - I cannot diagnose as the connector(443) does not even connect. I saw the same with the HTTP BIO connector on Tomcat 7.0.22. It would start responding intermittently and then stop responding completely. This particular Tomcat has a second HTTP connector pool for an Apache httpd using mod_proxy_http. That pool kept working beautifully. I went back to 6.0.x and now it all works beautifully, as I am used from Tomcat. I tried reproducing it on a load test machine, but it never showed there. I am at a loss where to start looking for this. Kees Jan On 12/24/2011 3:31 PM, Pid wrote: On 23/12/2011 14:47, Christopher Schultz wrote: Saravanan, On 12/23/11 7:03 AM, Saravanan L wrote: Please find the latest thread dump attached with mail. Tomcat 7 still crashes without acceptCount. I am wrong on this assumption. The response code is 504. It takes about 2 hours for this occur. The last status in http-apr-443 (In Server status ) is : Max threads: 5000 Seems high, as Chris says. Current thread count: 249 Can you post your full server.xml please, inline and with all XML comments/usernames/passwords removed. Current thread busy: 2 Low. Keeped alive sockets count: 40 Hmm? Where does that come from? Max processing time: 300477 ms Processing time: 8788.765 s Seems low for 2 hours of operation. Where does that number come from? Request count: 9223 Error count: 783 That's about 10%. What are those errors, exactly? Bytes received: 0.22 MB Bytes sent: 5.43 MB Both of those seem low for 2 hours of operation. What is your application/server doing? p What happens if you configure your HTTPS connector with fewer max threads, say, 50? Does the connector lock-up more quickly? What does your load profile look like? Is this observable in a testing environment or only in production? If you could set up a simple jmeter test against a test webapp, that would be ideal for trying to debug this issue. If you switch to NIO or BIO connector, does Tomcat become more stable, or do you experience the same phenomenon? -chris - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org -- Regards Saravanan.L This message and any attachment(s) contained here are information that is confidential, proprietary to TE Software and Services Pvt Ltd. and its customers. Contents may be privileged or otherwise protected by law. The information is solely intended for the individual or the entity it is addressed to. If you are not the intended recipient of this message, you are not authorized to read, forward, print, retain, copy or disseminate this message or any part of it. server.xml - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: What monitoring do you use/recommend?
Hi, Have a look at http://Java-monitor.com It will send mail or SMS when the tomcat dies. It will also make pretty graphs from the JMX data. And it is free. :) Kees Jan On 21 apr. 2011, at 17:25, Gautam R Singh (gautsing) gauts...@cisco.com wrote: Hi List, My team maintains a small Tomcat 6.x hosting environment for our group ( intranet only) use. And its growing now (30+ production TC JVM instances). We haven't been doing any monitoring just the URL availability test . And now we are looking for options to monitor it better, we enabled remote JMX on all the JVMs but our existing paid monitoring software isn't smart enough to use the JMX values intelligently. At the moment we just monitor the JMX attribute values (heap memory, threads, gc etc) and it spits out pretty graphs in reports. We would really want something which lets us -- if Currentthreads are 95% of maxthreads, send warn email or run this script. Don't want to deploy another war in each of those webapps dir and have 30 urls to check, something central which can query these via JMX rmi maybe generate pretty graphs like those in jconsole? Thanks! - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: How to detect down of tomcat.
Or you can install http://java-monitor.com It will send you an e-mail or SMS when Tomcat dies. Plus graphs for memory and file descriptors etc Kees Jan On 20 mrt. 2011, at 12:07, André Warnier a...@ice-sa.com wrote: Or write the script in perl. That way, it will be portable between Unix/Linux/Windows and basically whatever. Darryl Lewis wrote: You could write something similar using windows powershell. Do you have that installed on your server? On 20/03/11 2:14 PM, Hide hide3...@ob4.aitai.ne.jp wrote: Hi, Darryl. Thanks for your advice. Your script looks like very useful. But in my case, tomcat is running on Microsoft Windows. I am looking for a method to detect the down of tomcat by log file. - Original Message - From: Darryl Lewis darryl.le...@unsw.edu.au To: Tomcat Users List users@tomcat.apache.org Sent: Sunday, March 20, 2011 12:00 PM Subject: Re: How to detect down of tomcat. Put this in a cronjob to fire every minute #!/bin/sh if [ `ps -ef|grep tomcat|grep -v grep|wc -l` -lt 1 ] then subject=`tomcat down; date` address=m...@domain.com ps -efatt.txt mail -s $subject $addr -- -fno-reply@yourdomain att.txt fi Fill in the address with your email address, and you can also pipe an attachment For myself, I have scripts that detects when the service is down, sends me an email, then tries to restart it, then will email if it has managed to recover it. If it can't restart it after 5 minutes, then I get an SMS. In the morning, I can quickly see if it failed overnight, and my beauty rest only gets disturbed in the really bad cases. On 20/03/11 1:38 PM, Hide hide3...@ob4.aitai.ne.jp wrote: How to detect down of tomcat. Helo. My environment is tomcat7, java1.6, windows. When process of tomcat terminated abnormally, is there any method or setting that output the abnormal termination to a log file? If there is it, please let me know. tomcat is the premise that is not service of windows, but even service is good. The motive that wants to know such a thing is because I want to detect down of tomcat in automatically without human operation. I set a file and keyword in a log monitor tool, and it detects down of tomcat automatically. Thanks for your advice. - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: Accessing context information remotely - Context.getAvailable() etc.
Dear Ziggy, I was looking at the above for the above information as i am working on a client tool that tries to find out this exact information. The tool i am using connects to Tomcat via JMX but i am not sure if i can get the same information via JMX. Can i access the Context class? or is there any other way (Mbeans?) i can check if a context is running via JMX? You can get the same information using JMX. That's how Java-monitor.com does it. :) Why are you making a tool to get this information? There are loads of tools out there. -- Kees Jan http://java-monitor.com/ kjkos...@kjkoster.org 06-51838192 Change is good. Granted, it is good in retrospect, but change is good. - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: Tomcat died on java.lang.OutOfMemoryError: requested 2147483664 bytes for Chunk::new. Out of swap space? message
Dear Leon, It'd be nice to see some speed comparisons between -client -server and -Xint options and not only -server vs -Xint. I did some benchmarks with these settings. I was actually exploring hyperthreading in P4 hardware when I found -server to be twice as fast for even simple programs. http://java-monitor.com/forum/showthread.php?t=552 Ever since I have been calling -server the go faster flag. :) -- Kees Jan http://java-monitor.com/forum/ kjkos...@gmail.com 06-51838192 - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: Tomcat Shutdown suddenly / random
Dear All, I don't believe Tomcat has any System.exit calls in it, so you could grep your code looking for such calls. Note that findbugs can be used for that. It will issue a warning for code that calls System.exit(). -- Kees Jan http://java-monitor.com/ kjkos...@kjkoster.org 06-51838192 Change is good. Granted, it is good in retrospect, but change is good. - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: Stopping Catalina From MBean Server
Dear Gerukan, Is anybody try to stop the catalina engine from jconsole. I have been using Tomcat 6.0.20, and trying to stop Catalina from jconsole. I click Catalina/Service/Catalina/Operations/stop on the MBean view. INFO messages are written to the console related with stopping operation like below; . INFO : Stopping service CATALINA INFO : Stopping Coyote HTTP/1.1 on http-8080 But never shut downs cleanly and waits there. If you look at the MBean view now, some of them are removed. A while back I wrote a short howto on diagnosing Tomcat servers that hang on shutdown. Perhaps you find it useful? http://java-monitor.com/forum/showthread.php?t=616 In short: make a thread dump and hunt down the threads that should have died, but have not. -- Kees Jan http://java-monitor.com/ kjkos...@kjkoster.org 06-51838192 The secret of success lies in the stability of the goal. -- Benjamin Disraeli - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: Tomcat dies suddenly
Dear Carl, So this problem happens on one machine or on more than one? If it is limited to one machine, I would be inclined to run memtest86 on it to see if the RAM is good. Kees Jan On 4 feb 2010, at 02:07, Carl c...@etrak-plus.com wrote: Chris, Interesting idea. I tried over the weekend to force that situation with JMeter hitting a simple jsp that did some data stuff and created a small display. I pushed it to the point that there were entries in the log stating it was out of memory (when attempting to GC, I think) but it just slowed way down and never crashed. I could see from VisualJVM that it had used the entire heap but, again, I could never get it to crash. Strange because it doesn't have the classic signs (slowing down or throwing out of memory exceptions or freezing), it just disappears without any tracks. I am certain there is a reason somewhere, I just haven't found it yet. Thanks for your suggestions, Carl - Original Message - From: Christopher Schultz ch...@christopherschultz.net To: Tomcat Users List users@tomcat.apache.org Sent: Wednesday, February 03, 2010 5:45 PM Subject: Re: Tomcat dies suddenly -BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Chuck, On 2/3/2010 5:00 PM, Caldarale, Charles R wrote: From: Carl [mailto:c...@etrak-plus.com] Subject: Re: Tomcat dies suddenly I am hoping I can see failure at the point of failure with the heap dump options That won't have any effect on the Linux OOM killer. If it is the OOM killer taking out Tomcat, the JVM will not receive any notification - all threads will just be terminated with extreme prejudice. There won't be a chance for the heap dump to happen. Maybe what Carl should try is to actually cause an OOME without triggering the OOM Killer. Carl: you said that everything is copacetic when you run with a smaller heap, right? Well, run with that smaller heap, but then write a simply servlet/JSP/whatever that just allocates huge, say, byte[] buffers until it gets an OOME and verify that you get a heap dump when that happens. - -chris -BEGIN PGP SIGNATURE- Version: GnuPG v1.4.10 (MingW32) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iEYEARECAAYFAktp/JEACgkQ9CaO5/Lv0PBI0ACgmDLJVxM5xDiN5UIFsqqKRj7i 2J8AoL8ENGsYxwudtFrLy+tZTzmr/rxC =4yC9 -END PGP SIGNATURE- - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: Tomcat writing the wrong timestamp on compiled JSP's
Dear Mon Cab, Given the results below it looks like this is not a daylight savings time issue. In fact its extremely odd behavior. Both Tomcat and the OS have the correct time, and yet when Tomcat compiles the JSP, the java and class files in the work directory have a create / modified time-stamp exactly 1 hour ahead of the time that they were created. I have seen these issues in situations where I was working on an NFS drive when the server and my local machine had different ideas about what time it was. Are you working on a local disk, or a network mounted drive? -- Kees Jan http://java-monitor.com/ kjkos...@kjkoster.org 06-51838192 The secret of success lies in the stability of the goal. -- Benjamin Disraeli - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: Tomcat writing the wrong timestamp on compiled JSP's
Dear Mon Cab, Yes. That fixed it. Thankyou Kees. Glad to help. For some reason, the issue was with my WinSCP client. When I edited a jsp and then looked at the jsp file timestamp on the remote machine with WinSCP it showed the timestamp as my the current time (local and remote system times are the same). However, when I looked up the timestamp of the same edited JSP on the remote box it was stamped an hour ealier than the current time. I reconfigured WinSCP not to preserve the timestamp, and that fixed the issue. The wierd thing is that now WinSCP is showing the remote JSP files as being timestamped an hour later. Since the system time on my local machine is correct, I'm a bit confused as to what WinSCP is doing here. I have yet to meet a developer who truly understands working with time zones and who can write code that deals with multiple time zones correctly. I have met loads of developers who think they can, though. ;-) Also, NTP is your friend. -- Kees Jan http://java-monitor.com/ kjkos...@kjkoster.org 06-51838192 Human beings make life so interesting. Do you know that in a universe so full of wonders, they have managed to invent boredom. Quite astonishing... -- Terry Pratchett - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: JNDI DataSource Leaks
Dear Chris, I have to restart Tomcat regularly because it exhausted my MySQL connections. Show processlist confirms the problem. I use Hibernate. Do you? I'll dig deeper later when I have more time. Kees Jan On 7 aug 2009, at 16:53, Christopher Schultz ch...@christopherschultz.net wrote: -BEGIN PGP SIGNED MESSAGE- Hash: SHA1 All, Recently, there was a post on the list regarding connection pool leakage from Tomcat (ref: http://www.nabble.com/Right-way-to-close-database-connection-pool-td24832197.html ). I'm sure this question has come up before as well. I contributed a listener class that would shut down a JNDI DataSource and installed it in my development environment. Satisfied that I was protected from the evils of JDBC connection pool leakage, I moved on with my life. This morning, as I did a live build-and-re-deploy of my webapp, I saw the JNDIDataSourceShutdownListener doing its thing, and I got to thinking: I receploy my development webapp over and over again during the day and I've never run out of database connections. It's pretty rare that I have to really bounce Tomcat, so I decided to see what happened when I disabled my listener and let the alleged leak occur. My environment: Linux 2.6.14-gentoo-r5 #2 PREEMPT Sat Dec 17 16:30:55 EST 2005 i686 AMD Athlon(tm) XP 1700+ AuthenticAMD GNU/Linux java version 1.6.0_13 Java(TM) SE Runtime Environment (build 1.6.0_13-b03) Java HotSpot(TM) Client VM (build 11.3-b02, mixed mode, sharing) Tomcat 5.5.26 MySQL Connector/J 5.1.7 (installed into CATALINA_HOME/common/lib) MySQL Server 5.0.70 I deploy my webapp by creating a directory in my appBase and filling it with files, including my META-INF/context.xml file: Context reloadable=true WatchedResourceWEB-INF/struts-config.xml/WatchedResource Resource name=jdbc/myDataSource auth=Container type=javax.sql.DataSource maxActive=1 maxIdle=1 maxWait=1 url=jdbc:mysql://localhost.localdomain/myDb? characterEncoding=utf8amp;dumpQueriesOnException=true username=scott password=tiger driverClassName=com.mysql.jdbc.Driver removeAbandoned=true removeAbandonedTimeout=30 logAbandoned=true testOnBorrow=true validationQuery=/* ping */ SELECT 1 / Resource name=jdbc/myOtherDataSource auth=Container type=javax.sql.DataSource maxActive=1 maxIdle=1 maxWait=1 url=jdbc:mysql://localhost.localdomain/myOtherDb? characterEncoding=latin1amp;dumpQueriesOnException=true username=scott password=tiger driverClassName=com.mysql.jdbc.Driver removeAbandoned=true removeAbandonedTimeout=30 logAbandoned=true testOnBorrow=true validationQuery=/* ping */ SELECT 1 / /Context Yes, I have two JNDI DataSources. I re-deploy my webapp by simply replacing whatever files need to be updated. If I touch a .class file in WEB-INF/classes, Tomcat will reload my webapp. I disabled my JNDI DataSourceShutdownListener and repeatedly recompiled a class and updated my webapp's deployment directory. Tomcat redeployed my web application each time, and I ran mysqladmin -u root processlist every second or so during the restart to see what was happening with the server. If I was lucky, I could see both the old connection (there's only one) from my primary DataSource (the first one listed) and the new one at the same time (my webapp reads a bunch of stuff from the db on startup, so a JDBC connection is immediately created and used from the primary DataSource. The secondary DataSource is rarely used and no connections were ever established via that DataSource during my tests. After a second or two, the old connection would disappear from MySQL server's process list. Sometimes, I could get it to hang around for as much as 30 seconds after the redeploy, but it always dies. I suspect that the delay has to do with GC scheduling. Finally, after several restarts, I tried checking the heap: $ ./jmap -histo:live 16816 | grep BasicDataSource 369: 2240 o.a.t.dbcp.dbcp.BasicDataSource Hmm... maybe there are a bunch of dead ones laying around: $ ./jmap -histo 16816 | grep BasicDataSource 369: 2240 o.a.t.dbcp.dbcp.BasicDataSource Nope. So it appears that on my setup, this leak does not occur. (!) I have a theory about this. In all my years of using MySQL, I have discovered that it is very developer-friendly. That is, it is very tolerant of abuse: you can write the sloppiest JDBC code imaginable and never run out of resources on the server side. Oracle, on the other hand, I have observed to be very consistently adamant about managing every little detail of your connections, statements, cursors, etc.: if you forgot to close a ResultSet somewhere, you were screwed (in spite of the fact that the JDBC spec requires that ResultSets bound to Statements
Re: Tomcat Memory Script
Dear Matt, I am not too familiar with jmap, jstack or jinfo. I could write a script that uses jmap to get the memory of the tomcat running and then store the necessary information in a log file. That is an option, or you could use a tool that does that for you, plus make nice graphs. Check out http://java-monitor.com and see http://java-monitor.com/forum/livedemo.php for a live demo. It should take you about five minutes to set up. If it takes you longer, I'd love to hear why. :-) -- Kees Jan http://java-monitor.com/forum/ kjkos...@kjkoster.org 06-51838192 Change is good. Granted, it is good in retrospect, but change is good. - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: Preventing OutOfMemoryError: Java heap space
Dear Todd, I'm not sure I can use session counting, as my session size is not consistent. I could try to estimate the size of each session, and keep a global counter, but that seems like a lot of work. JMX offers quite a bit of insight in what your GC is doing. You could implement throttling as a function of the number of full GC's that your system experiences. While full GC's do happen from time to time, you could trigger if they happen more than once per so-many seconds. Actual values would probably be highly application-specific. I agree with someone else that 256MB is not a whole lot or RAM for a busy server. With current prices of RAM I would go for a gig or two and take it from there. I understand that garbage collection is, err, whimsical, but I think I'm going to give it a go anyway. I will keep in mind that the memory results from Runtime will probably under-report the available memory. I'm going to add an explicit request for garbage collection, _before_ the memory becomes seriously depleted. Here is what happens if you do http://java-monitor.com/forum/showthread.php?t=188 It is not pretty, I can tell you that. I add -XX:-DisableExplicitGC to my JAVA_OPTS for this very reason. -- Kees Jan http://java-monitor.com/forum/ kjkos...@kjkoster.org 06-51838192 The secret of success lies in the stability of the goal. -- Benjamin Disraeli - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: #include'ing property files into conf/catalina.properties
Dear uma_rk,
We centralize configurations in /etc/conf and hence I would
like to import property configuration files into
${CATALINA_BASE}/conf/catalina.properties
using #include as in
// conf/catalina.properties
...
#include /etc/conf/mytomcat.properties
...
Please let me know if this is possible.
Not out of the box. I'm sure that you can script something to this
effect in your system's startup script though. Add some placeholders
and used sed or even gcc's precompiler if you insist on the #include
syntax.
Personally I store all my configurations in SVN, relying on SVN's diff
function to help me iron out any differences. Granted, that won't
scale beyond 10 or so Tomcat configurations, but it does the job until
you reach that stage.
--
Kees Jan
http://java-monitor.com/forum/
kjkos...@kjkoster.org
06-51838192
Change is good. Granted, it is good in retrospect, but change is good.
-
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Re: 15 second for redeployment is to much
Dear Khlystov, 1. 5 second (using maven) compile source ( usually it is 1 or 2 files ) 2. 0 second copy *.class file into Tomcat/webapps Stop using Maven for simple compiles and write a small shell script that just calls javac with the webapp's WEB-INF/classes as output dir. 3. 5-7 seconds waiting while Tomcat finds that my webapp deployed files are changed There is a timer somewhere that you can lower for this. I forget precisely which one. It will slow down Tomcat a bit, but you will redeploy faster. 4. 1 seconds takes to undeploy my webapp 5. 3-5 seconds takes to deploy ( really initialize Wicket Spring Beans frameworks with my data) Well, you chose these frameworks, so you'll have to live with their startup times. Lazy initialisation *may* help, if you initialise more than you need for a specific test. -- Kees Jan http://java-monitor.com/forum/ kjkos...@kjkoster.org 06-51838192 Rule 1 for being in a hole: stop digging. - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: Is there a configurable parameter in web.xml for....
Dear Paul, ... the time period that tomcat spends honouring current requests when the server is shutdown? We have a web app used for secure file transfers and occasionally we need to take it down, however some requests for downloads can take more than an hour as the system allows very large files to be uploaded. I know tomcat will stop taking new requests when the server is stopped, but what would be good would be to set a parameter saying fully honour all current requests before you completely finish (tomcat may already do this I am not sure). Tomcat does not do this out of the box. Since you have special requirements, you could program this yourself. You could write a servlet that shuts down the HTTP connector using JMX. I am not 100% sure that that will not kill the running threads, but you can easily test that. Here is some code to access the connector and stop and start it. http://java-monitor.com/forum/showthread.php?t=169 Accessing the Tomcat server to kill it is a matter of finding the right mbean and method to invoke. You can use jconsole to examine the mbeans in your Tomcat server. -- Kees Jan http://java-monitor.com/forum/ kjkos...@kjkoster.org 06-51838192 Rule 1 for being in a hole: stop digging. - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: Tomcat Shutdown
Dear Aleksandr, So how to ping to application so that tomcat is going to be shutdown? http://java.sun.com/javaee/5/docs/api/javax/servlet/ServletContextListener.html Register it in web.xml -- Kees Jan http://java-monitor.com/forum/ kjkos...@kjkoster.org 06-51838192 The secret of success lies in the stability of the goal. -- Benjamin Disraeli - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: Hello
Dear Okey, Am using windows vista and i wish to know what version of apache tomcat to download. Any version you like. -- Kees Jan http://java-monitor.com/forum/ kjkos...@kjkoster.org 06-51838192 Rule 1 for being in a hole: stop digging. - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: deploying web application on remote server
Dear sneha, I have developed web application using netbeans , I wish to deploy on remote server . I have placed files under / webapps directory of remote server. Tomcat is unable to locate libraries . how do I make tomcat locate libraries which are under WEB-INF/lib folder Why don't you give us an error message to look at? Then we might be able to help you. -- Kees Jan http://java-monitor.com/forum/ kjkos...@kjkoster.org 06-51838192 Rule 1 for being in a hole: stop digging. - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: How to exclude some classes to being serialized in sharing session with clustered tomcats?
Dear Stanimir, How to exclude some classes to being serialized in sharing session with clustered tomcats? I`m using hibernate, spring, java mail, apache commons dbcp, pool ... and to serialize/deserialize sessions all the classes must implement Serializable (or Externalizable), and I think that it`s not a solution to correct all classes I use in all APIs. And why the application scope beans are serialized too? They are probably referenced from objects in your sessions. Please read up on the Serializable and Externalizable interfaces and Java's transient keyword. -- Kees Jan http://java-monitor.com/forum/ kjkos...@kjkoster.org 06-51838192 Human beings make life so interesting. Do you know that in a universe so full of wonders, they have managed to invent boredom. Quite astonishing... -- Terry Pratchett - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: [Tomcat] [daemon] java.lang.OutOfMemoryError unable to create new native thread
Dear Steve, One additional restriction I have is a security bureaucracy from hell. As far as console access I have a two-hop connection. Is there no test system that you can use to reproduce this, under less insane restrictions? Have you considered hauling your behind to the data center to sit behind the console for a few hours? In the past I found that I could spend days fighting the bizarre rules with half- working technical solutions, or just go to the actual machine and look at the display there. Of course, it was only a two hour drive in my case. Yours might well be at the other end of the world. As far as GUI access I have some crappy device to log into that lets me have really bad keyboard/mouse control of the machine, which, unless I can overcome this means that GUI-based tools are not going to work, and as for remote GUI access, see above security bureaucracy. Which means I'm looking for command-line equivalents for what JConsole does, particularly the threads tab. Any ideas along that path? There are some JMX command line tools, but JMX is really easy to use from code. You could write a simple JSP page to give you the figures that way. Script with curl/wget and graph with Excel. :) -- Kees Jan http://java-monitor.com/forum/ kjkos...@kjkoster.org 06-51838192 The secret of success lies in the stability of the goal. -- Benjamin Disraeli - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: dbcp pool freezing
Dear Eric, and see that all my threads are in the WAITING state from org.apache.tomcat.dbcp.pool.impl.GenericObjectPool.borrowObject (GenericObjectPool.java:810) I don't believe I have any connection leaks in my code Belief is not a substitute for evidence... Your webapp is clearly not returning connection objects to the pool in a timely fashion. I am tempted to agree with you; I just am having trouble understanding how or why they aren't being returned properly. I'd suggest you look into hooking your application up to Java- monitor.com. It will pick up on Tomcat-managed data sources automatically, and it can also help you do Hibernate session leak detection (if you use Hibernate). http://java-monitor.com/forum/livedemo.php shows you what it looks like. Just click on another server @ ... to see the database connection pool usage and Hibernate sessions over the past two days (scroll down to Hibernate Sessions). If you prefer a local solution, check out p6spy. It has the capability of giving you a stack trace for each abandoned database connection. Alternately, it can show you the stack trace of each allocated JDBC connection. Of course, such stack traces are relatively expensive to make for each database operation, so you may want to disable that functionality once you solved your issues. :) -- Kees Jan http://java-monitor.com/forum/ kjkos...@kjkoster.org 06-51838192 Human beings make life so interesting. Do you know that in a universe so full of wonders, they have managed to invent boredom. Quite astonishing... -- Terry Pratchett - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: Facing “Javax.servlet.servletException: c annot connect to windows server”. error
Dear prakash.s, I had visited the link suggested by you, please let me know how to change the java property -Djava.awt.headless=true Is it just enough to type the command prompt? For tomcat, you can either edit catalina.sh and add it after the Java command, for example. Google for tomcat JAVA_OPTS. -- Kees Jan http://java-monitor.com/forum/ kjkos...@kjkoster.org 06-51838192 Human beings make life so interesting. Do you know that in a universe so full of wonders, they have managed to invent boredom. Quite astonishing... -- Terry Pratchett - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: Facing “Javax.servlet.servletException: c annot connect to windows server”. error
Dear S.Prakash, I am using jrxml for preparing the reports in excel files. It is working fine in windows but if the same is implemented (server)MAC OS tomcat I am facing Javax.servlet.servletException: cannot connect to windows server – not enough. I am using Tomcat 5.5.28 as server, MYsql as database and MAC(Tiger) as OS. Please suggest to over come this issue. Have you considered trying to use -Djava.awt.headless=true and unset DISPLAY? http://java-monitor.com/forum/showthread.php?t=3 -- Kees Jan http://java-monitor.com/forum/ kjkos...@kjkoster.org 06-51838192 Human beings make life so interesting. Do you know that in a universe so full of wonders, they have managed to invent boredom. Quite astonishing... -- Terry Pratchett - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: JMX Controlpanel Application
Dear Gerardus, I was just wondering if anyone can recommend a open source that one can use to build control panels based on jmx properties published by the jvm or your own application. We have monitoring software that can alert us when some jmx values exceeds a threshold but I would like to see a tool where I can easily collate different servers and be able to connect a button to a jmx action. (apologies if I don't use the correct jmx terminology). JMX is pretty easy to use from your own code. I wrote some JSP's in the past that would do simple management operations on MBeans in a Tomcat server. Here is some code that I wrote to restart a Tomcat connector using JMX. Otherwise, there are some command line tools that alloy you to make JMX calls and use JMX operations. -- Kees Jan http://java-monitor.com/forum/ kjkos...@kjkoster.org 06-51838192 The secret of success lies in the stability of the goal. -- Benjamin Disraeli - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
networkaddress.cache.ttl and networkaddress.cache.negative.ttl
Dear All, Do any of you guys tune networkaddress.cache.ttl or networkaddress.cache.negative.ttl? If so, what values do you use? -- Kees Jan http://www.kjkoster.org/ kjkos...@gmail.com 06-51838192 - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: Is it possible to delay HTTP port opening?
Dear Jesper, At server startup, is it possible to configure tomcat to not open it's http ports so early? By default the server starts to receive http requests quite long before initialization is complete. These requests are held open until the server is ready to respond, and then the response is sent. In my case this behavior is not desirable, I would like the server to be fully ready and warmed up before the http port is actually opened for requests. The reason is the server is part of a load balanced pool, and if the load balancer detects a just-started server too early, users will experience unacceptably long response times. I believe the suggestion to improve the loadbalancer detection logic is the better one. But, in case that is a closed source beast: You could use a script on the Tomcat machine to only open the HTTP ports in the firewall of that machine after a few seconds from Tomcat starting. Each machine does have its own port filtering, right? You could review the code in your Tomcat webapp to take away some of the slow starting-ness. On modern hardware a webapp should be up and running in a few seconds, and careful background-loading should spread out other startup initialisation. -- Kees Jan http://java-monitor.com/forum/ kjkos...@kjkoster.org 06-51838192 The secret of success lies in the stability of the goal. -- Benjamin Disraeli - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: How to turn off JNDI datasource connection pooling
Dear Keith, It's not clear what you want to do (as opposed to what you don't want to do). Is your goal to use a new DB connection for every DB access your webapp makes, or do you want to do DB connection pooling inside your webapp, or ??? Not using connection pooling at all is a real performance killer. - Chuck The security for the data within the database is entirely baked into the restriction that every user has their own database connection. As far as I can tell it is not possible to use connection pooling a retain secure access to the data without an awful lot of re-work. At the moment I am using a new DB connection for every DB access my app makes. Later I may implement my own database polling but either way it will be my code initiating connection requests not Tomcat's. Setting maxactive to zero stops exceptions but the app just seems to be hanging. Two options that I see: 1) Why are you still using Tomcat's pool at all? Just create your own connections in the code. Instead of each lookup just do the old driver.createConnection() etc. Where driver is some static somewhere. 2) Write a trivial connection pool and drop it into the Tomcat lib. Use the new Tomcat JDBC pool code as a starting point. -- Kees Jan http://java-monitor.com/forum/ kjkos...@kjkoster.org 06-51838192 The secret of success lies in the stability of the goal. -- Benjamin Disraeli - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: connector restart / api
Dear Mike, What is the recommended way if any, of restarting the http Connector ? i.e. is there an api for achieving this? You asked before. I suggested you use JMX. Have you made any headway in that direction? -- Kees Jan http://java-monitor.com/forum/ kjkos...@kjkoster.org 06-51838192 Rule 1 for being in a hole: stop digging. - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: connector restart / api
Dear Mike, You mentioned JMX - would I be able to use JMX in such a way that it would allow me to restart the connector programatically upon a url request into my web app? I wrote some sample code that does just that, have a look at http://java-monitor.com/forum/showthread.php?t=169 Does this answer your question? -- Kees Jan http://java-monitor.com/forum/ kjkos...@kjkoster.org 06-51838192 Human beings make life so interesting. Do you know that in a universe so full of wonders, they have managed to invent boredom. Quite astonishing... -- Terry Pratchett - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: Pros and cons of readonly UserDatabase (tomcat-users.xml)
Dear Petr, any comment on this subject? The question is related to OpenSolaris package (*) where we have all files owned by root and tomcat is executed with dedicated user credentials. Currently tomcat-user.xml and conf directory is owned by tomcat user but it makes some noise in our package auditing. The question is what is limitation of setting user database as readonly (in server.xml) for Tomcat 6.0.18 and having tomcat-user.xml and conf directory owned by root. Does tomcat-users.xml ever have to be written from Tomcat? I routinely run with tomcat-users.xml as read-only and it is no problem for me. I don't actually use that mechanism at all. -- Kees Jan http://java-monitor.com/forum/ kjkos...@kjkoster.org 06-51838192 Human beings make life so interesting. Do you know that in a universe so full of wonders, they have managed to invent boredom. Quite astonishing... -- Terry Pratchett - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: Tomcat ./shutdown
Dear Thinh, I use apache-tomcat-5.5.17 and sometimes when I call ./shutdown.sh, the java process which runs Tomcat still alive. Because this java process is still alive, the next call ./startup.sh does not work. Thus, I have to kill this Java process first. Could you please give me a hint how I avoid this problem? Here is some discussion on your issue: http://java-monitor.com/forum/showthread.php?t=83 Basically, kill -3 Tomcat as it hangs after you tried to shut it down. Then solve the problem that causes your Tomcat to hang. -- Kees Jan http://java-monitor.com/forum/ kjkos...@kjkoster.org 06-51838192 The secret of success lies in the stability of the goal. -- Benjamin Disraeli - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: Tomcat restart using code
Dear Mike, Since I have not found a documented way of refreshing the ServerSocketFactory (in order to reload the ssl trust store) I would like to be able to perform a Tomcat Restart from within i.e. restart Tomcat using java code inside the servlet. Restarting the connector would also do the job for me. There was some discussion about this subject on Java-monitor: http://java-monitor.com/forum/showthread.php?t=152 You can use JMX to find the connector mbeans to restart them. I'm curious why you would want to do that, though? -- Kees Jan http://java-monitor.com/forum/ kjkos...@kjkoster.org 06-51838192 The secret of success lies in the stability of the goal. -- Benjamin Disraeli - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: what have i done to get 9 million cookies?
Dear Leon, i'm performing a jmap -histo:live on a tomcat which froze because of full (8GB) old space gen, and my top 10 looks like: num #instances #bytes class name -- 1: 19268009 2655683368 [C 2: 17410092 1392807360 org.apache.tomcat.util.buf.MessageBytes 3: 17411294 1114322816 org.apache.tomcat.util.buf.ByteChunk 4: 17410562 974991472 org.apache.tomcat.util.buf.CharChunk 5: 19275640 771025600 java.lang.String 6: 8697280 626204160 javax.servlet.http.Cookie 7: 8699584 417580032 org.apache.tomcat.util.http.MimeHeaderField 8: 188 134247456 [Lorg.apache.tomcat.util.http.MimeHeaderField; 9:198645 114493776 [Ljava.lang.Object; 10: 21303 30450504 [B So how did I manage to get almost 9 million of mimeheaderfields and cookies and 17 millions message bytes and chunks. During normal operation mode the number of the above doesn't increase except before the gc freeze. You can try to generate a heap dump and analyse it using jhat. Trouble is, jhat requires insane amounts of memory. So for you 8GB dump you'd need something in the order of 32GB RAM for jhat. If that is feasible, you could lower the memory limits on your machine, run the tests again to get a smaller dump with (hopefully) the same characteristics. -- Kees Jan http://java-monitor.com/forum/ kjkos...@kjkoster.org 06-51838192 The secret of success lies in the stability of the goal. -- Benjamin Disraeli - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: Servlets works fine, JSP's don't
Dear davefury, The logs doesn't give me any information about the error. The environment is Debian Etch with Apache2, mod_jk connector and tomcat 5. Hmmm, Debian... Are you using the sucky repackaged Tomcat from the distro, or the normal one that you downloaded from tomcat.pache.org manually? If you are using the repackaged one, the Debian package is a nonstandard configuration that (among other things) suppresses much of the debug output of Tomcat. To eliminate Apache from the equation, you could consider an ssh tunnel. I'd like to know that your Tomcat is not the Debian package first, though. -- Kees Jan http://java-monitor.com/forum/ kjkos...@kjkoster.org 06-51838192 The secret of success lies in the stability of the goal. -- Benjamin Disraeli - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: Tomcat 5.5 error
thank u again. I have downloaded the binary version and placed it on my desktop and And ran it using sh startup.sh. and then I access the http://localhost:8080/ site successfully. but when i try to access http://localhost:8080/mms_test. I get the same error as before. However when I try to access the log file, there is only one file: catalina.out and here it's its content: ./catalina.sh: 357: /usr/bin/java/bin/java: not found ./catalina.sh: 357: /usr/bin/java/bin/java: not found ./catalina.sh: 357: /usr/bin/java/bin/java: not found You did set JAVA_HOME? -- Kees Jan http://java-monitor.com/forum/ kjkos...@kjkoster.org 06-51838192 The secret of success lies in the stability of the goal. -- Benjamin Disraeli - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: Performance with Tomcat
Dear Chris, We've been running into some issues lately with our Tomcat 6 instances where performance will slow to a crawl. Unfortunately, no error messages are present in the logs and we really don't know why this is happening. It does appear that the issue is happening when we get a lot of users on the system at one time. It would make sense, but we're only talking about 300 or so concurrent users. There must be a point of misconfiguration on our part but none of us really have any experience with Tomcat outside of simply setting it up and running it out of the box, which isn't much. So, that leads me to why I'm posting to the user list: 1. Are there any tools or utilities we can use to get an understanding of what Tomcat is doing while it's running (processes, memory per process, and more)? VisualVM, JConsole, Java-monitor.com, many commercial tools. 2. I suspect there are some very large Tomcat installations out there. Has any information from those installations been published? Is there a guide or set of documentation on how to scale with Tomcat as a web server? There is a lot of documentation, but more on tuning Java, rather than Tomcat. Tomcat has surprisingly few tunables that get mentioned on this list. It is pretty lightweight in the sense that there is not a whole lot of Tomcat going on between you and an incoming HTTP request. Most likely, if you tune the underlying VM to your workload, your problems go away (or move to a place that is not your jurisdiction). Perhaps we can help? What is your machine doing when Tomcat is slow? Network/disk I/O- bound? CPU-bound? What percentage is your machine spending in system time, as opposed to user time? -- Kees Jan http://java-monitor.com/forum/ kjkos...@kjkoster.org 06-51838192 The secret of success lies in the stability of the goal. -- Benjamin Disraeli - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: Redeploy leaks
Dear Adriano, As I had having OutOfMemory exceptions (PermGen) when redeploying an application, I started to verify things using Eclipse Memory Analyzer. I've discovered some real leaks, for example caused by the Java Disposer thread being instantiated using the Webapp classloader. After fix this, when I redeploy the application, Memory Analyzer shows that there are no non-weak/soft references to the undeployed classloader. But it (and the classes allocated by it) is never garbaged collected. I've tried different VM switches (-XX:+CMS*) and none make the classloader be collected. Thinking about word Perm (permanent) and some sources, I've done non-web testing and there a custom classloader *is* garbaged collected. So what could be the problem when running in Tomcat? I'm using Tomcat 6.0.18, JDK 1.6.0-10 (Linux and Windows) and Apache Wicket. I've not put any libraries in tomcat/lib, they are all on the WEB-INF/lib. Wicket uses ThreadGlobals, but I don't think this may be a problem, because Eclipse Memory Analyzer seems to show references from them, but it didn't show any references in my case! Here's some more discussion in that subject. http://java-monitor.com/forum/showthread.php?t=7 In particular, that thread suggests you read http://opensource.atlassian.com/confluence/spring/pages/viewpage.action?pageId=2669 for some known permgen leak offenders. Perhaps some of these might give you more corners to peel at for your application? -- Kees Jan http://java-monitor.com/forum/ kjkos...@kjkoster.org 06-51838192 Human beings make life so interesting. Do you know that in a universe so full of wonders, they have managed to invent boredom. Quite astonishing... -- Terry Pratchett - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: Sessions not releasing for apache-tomcat 5.5.23
Dear Sudip, But recently there are couple of occasions where one or more users are failing to forcefully logoff the session.(thelogs shows clearly the pending sessions keeps on increasing and the value unbound is never called for the particular user failing to forcefully logoff. Well, we cannot look into your code, so there really is nothing that we can help you with. I would say that you should write a few unit tests with httpunit and use those to reproduce the situation you try to solve. Then test and debug from there. Unless you think this is due to some kind of bug in Tomcat, in which case we need a test case that reproduces this problem. -- Kees Jan http://java-monitor.com/forum/ kjkos...@kjkoster.org 06-51838192 The secret of success lies in the stability of the goal. -- Benjamin Disraeli - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: Tomcat MySQL Server Configuration
Dear Carl, I am trying to figure out the best way to configure a multi-server setup for Tomcat and MySQL. Someone gave me the a list of configuration suggestions (see link below). My question is is configuration 3 (see link below) a good way to go when scaling up from our current configuration (config. 0)? If not, which one would be the best. I know this is pretty generalize but I a just looking for a standard 2-4 server configuration that is used the most and that is well balance. http://www.sieducation.com/images/Server Topologies 2.JPGftp://ftp-dom.earthlink.net:21//webdocs/images/Server I cannot access that link. Dunno if it's the spaces or permissions. -- Kees Jan http://java-monitor.com/forum/ kjkos...@kjkoster.org 06-51838192 Rule 1 for being in a hole: stop digging. - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: How do you determine the amount of Tomcat threads in use?
Dear Mark, Just a quick question on how to see threads in use, I have been using prstat -L -p tomcat java process, however I suspect this is not the correct way to do it. You can also attach jconsole of vsiualvm to check. That has the added benefit of being able to see not only the actual number of threads in use, but also the fill levels of your Tomcat thread pools. -- Kees Jan http://java-monitor.com/forum/ kjkos...@kjkoster.org 06-51838192 Rule 1 for being in a hole: stop digging. - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: No printer found error on Tomcat restart
Dear Tony, We have a Tomcat 5.5.20 installation running as a service on Windows 2003 Server standard x64 operating system using version 1.6.0_07 (x86) jre. The Tomcat service is running as a user which has all administrator rrights and is started automatically on server startup. Are you absolutely sure that the user rights are identical for a console start and a reboot-start? -- Kees Jan http://java-monitor.com/forum/ kjkos...@kjkoster.org 06-51838192 Human beings make life so interesting. Do you know that in a universe so full of wonders, they have managed to invent boredom. Quite astonishing... -- Terry Pratchett - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: How to serve JSPs (and other resources) from within a jarfile?
Dear Simon, I have embedded the jspwiki project within my own webapp, to provide a help engine. The jspwiki project provides java classes (in a jarfile) plus some .jsp files and assorted resource-files (images, scripts, etc). Currently I put all the java classes as a jarfile in my classpath (ok), and also unpack the jsp and resource files into my webapp's content directory (ugly). Could you elaborate on why using a separate webapp/war-file for the wiki is not working for you? In your shoes I would probably do just that. Break out the help engine into its own webapp for people to install separately. -- Kees Jan http://java-monitor.com/forum/ kjkos...@kjkoster.org 06-51838192 The secret of success lies in the stability of the goal. -- Benjamin Disraeli - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: Question on JVM memory in tomcat
Dear user080701, I am using the tomcat manager to monitor the health of the tomcat server. I found that the session of JVM, it shown the following information: JVM Free memory: 38.13 MB Total memory: 111.18 MB Max memory: 1365.37 MB As David pointed out, this is probably measured against the committed memory, not the max memory. I just wrote a small post about memory leaks http://java-monitor.com/forum/showthread.php?t=150 In that post I also talk about the difference between maximum memory and committed memory. Is my tomcat in good condition or not? It seems that the free memory is only 38.13MB? I have added the following lines in my startup.sh export JAVA_HOME=/opt/jdk export JAVA_OPTS=-Xmx1536m export CATALINA_HOME=/opt/tomcat How to know whether my tomcat can use the memory or not? You need some form of monitoring that plots max, committed and used memory over time, rather than give you samples in numeric format. You could hook your Tomcat up to Java-monitor. Java-monitor tracks you memory usage over two days, so you can see how the memory usage develops over time. The graphs in the post are made with Java-monitor. To use Java-monitor just register on the Java-monitor forum and download the probe once you are logged in. -- Kees Jan http://java-monitor.com/forum/ kjkos...@kjkoster.org 06-51838192 The secret of success lies in the stability of the goal. -- Benjamin Disraeli - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: configure JNDI to avoid error Last packet sent to the server was xxxxx ms ago
Dear removeps-groups, Thanks for the links. But in answer to the issues below: chmod 600 is not sufficient because the admin of my website should not be able to see the passwords either. And if you're using a web hosting service, all the more reason. The decryption algorithm may need a license key which is installed only on that machine, so copying the contents of the lib folder may not be sufficient. Though I have to admit, mines is not that complex! Euh. You admin probably has root. Even chmod 000 won't stop him. If your implementation does not work with a license server, you've wasted your time. Sorry. :-) Have you managed to fix your connection pool issues? Kees Jan --- On Sun, 12/7/08, Kees Jan Koster [EMAIL PROTECTED] wrote: From: Kees Jan Koster [EMAIL PROTECTED] Subject: Re: configure JNDI to avoid error Last packet sent to the server was x ms ago To: Tomcat Users List users@tomcat.apache.org Date: Sunday, December 7, 2008, 12:39 AM Hmm. Lots of trouble for a file that you can just chmod 600 to avoid this whole issue. But that's just how I do this. You realize of course that this precisely as safe as storing a plain- text password. I mean, if I can read this file with the encrypted password, I can see that you use a non-standard MySQL driver. So I would just download the contents of your Tomcat's lib directories. I presume they have the same directory and file permissions as the data source config file. I don't care what the password is. I just copy your config, plop the contents of your Tomcat's lib dir into mine and I can connect to your database just fine. - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] -- Kees Jan http://java-monitor.com/forum/ [EMAIL PROTECTED] 06-51838192 The secret of success lies in the stability of the goal. -- Benjamin Disraeli - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: configure JNDI to avoid error Last packet sent to the server was xxxxx ms ago
Dear removeps-groups, Thanks for the links. But in answer to the issues below: chmod 600 is not sufficient because the admin of my website should not be able to see the passwords either. And if you're using a web hosting service, all the more reason. The decryption algorithm may need a license key which is installed only on that machine, so copying the contents of the lib folder may not be sufficient. Though I have to admit, mines is not that complex! Euh. You admin probably has root. Even chmod 000 won't stop him. If your implementation does not work with a license server, you've wasted your time. Sorry. :-) Have you managed to fix your connection pool issues? Kees Jan --- On Sun, 12/7/08, Kees Jan Koster [EMAIL PROTECTED] wrote: From: Kees Jan Koster [EMAIL PROTECTED] Subject: Re: configure JNDI to avoid error Last packet sent to the server was x ms ago To: Tomcat Users List users@tomcat.apache.org Date: Sunday, December 7, 2008, 12:39 AM Hmm. Lots of trouble for a file that you can just chmod 600 to avoid this whole issue. But that's just how I do this. You realize of course that this precisely as safe as storing a plain- text password. I mean, if I can read this file with the encrypted password, I can see that you use a non-standard MySQL driver. So I would just download the contents of your Tomcat's lib directories. I presume they have the same directory and file permissions as the data source config file. I don't care what the password is. I just copy your config, plop the contents of your Tomcat's lib dir into mine and I can connect to your database just fine. - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] -- Kees Jan http://java-monitor.com/forum/ [EMAIL PROTECTED] 06-51838192 The secret of success lies in the stability of the goal. -- Benjamin Disraeli - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: configure JNDI to avoid error Last packet sent to the server was xxxxx ms ago
Dear removeps-groups, How to configure JNDI in order to avoid the error Last packet sent to the server was x ms ago.? I've seen two other errors which seem to be from the same cause: Communications link failure and Connection.close90 has already been called. This is what I've come up with, but wonder if it is is good and efficient: Resource name=jdbc/myname auth=Container type=javax.sql.DataSource driverClassName=my.custom.mysql.Driver url=[EMAIL PROTECTED]:mysql://localhost:3306 username=user password=encode:abcdefg initialSize=1 maxActive=15 maxIdle=15 minEvictableIdleTimeMillis=4320 maxWait=5000 removeAbandoned=true removeAbandonedTimeout=30 logAbandoned=true testOnBorrow=true testWhileIdle=true validationQuery=select 1/ The my.custom.mysql.Driver class decodes and decrypts the password, and passes these to the base class, which is com.mysql.jdbc.NonRegisteringDriver. Hmm. Lots of trouble for a file that you can just chmod 600 to avoid this whole issue. But that's just how I do this. You realize of course that this precisely as safe as storing a plain- text password. I mean, if I can read this file with the encrypted password, I can see that you use a non-standard MySQL driver. So I would just download the contents of your Tomcat's lib directories. I presume they have the same directory and file permissions as the data source config file. I don't care what the password is. I just copy your config, plop the contents of your Tomcat's lib dir into mine and I can connect to your database just fine. I read that the validationQuery=select 1 validates the connection before returning it to the user. If the select statement fails, then the connection is removed from the pool and a new one is created. What I'm not sure is if I need the testOnBorrow=true and testWhileIdle=true. Here is how I dealt with that issue: http://java-monitor.com/forum/showthread.php?t=70 You can see my config file in the last post of the thread. I found you need only testWhenIdle. I set it to once a minute, so that I never have stale connections in the pool, thus the issue of dealing with them never comes up. I have been running like this for months and seen no issues since. No overhead that I notice, but I'd love to see some scientific measurements from you to prove me wrong. From anyone, for that matter. ;-) -- Kees Jan http://java-monitor.com/forum/ [EMAIL PROTECTED] 06-51838192 Human beings make life so interesting. Do you know that in a universe so full of wonders, they have managed to invent boredom. Quite astonishing... -- Terry Partchett - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: When does Tomcat throw an OutOfMemory exception?
Dear Chuck, To add to Leon's list: running out of file descriptors. Actually, in such situations you get 'java.io.IOException: Too many open files' or 'java.net.SocketException: Too many open files'. Not an OutOfMemory error. /nitpick -- Kees Jan http://java-monitor.com/forum/ [EMAIL PROTECTED] 06-51838192 Rule 1 for being in a hole: stop digging. - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: When does Tomcat throw an OutOfMemory exception?
Dear Chuck, Actually, in such situations you get 'java.io.IOException: Too many open files' or 'java.net.SocketException: Too many open files'. Not an OutOfMemory error. Only if it's related to an application-initiated action, such as opening a stream. If FD exhaustion is detected during an internal JVM operation, that will often result in an OOME. Oh, that is interesting. Thank you for correcting me. I guess they needed a RuntimeException and picked OOME. Grepping through the sources reveals that there are some other sources of OOME's too. I'd have to look at them to see which resource is actually being depleted, but it's a reminder to read the exception message with some attention. -- Kees Jan http://java-monitor.com/forum/ [EMAIL PROTECTED] 06-51838192 Human beings make life so interesting. Do you know that in a universe so full of wonders, they have managed to invent boredom. Quite astonishing... -- Terry Partchett - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Configuration Quandary - Servicing static page from app root
Dear John, Sure would appreciate some feedback or ideas on this... Have you looked at Apache's mod_rewrite at all? I sounds like that module might help. -- Kees Jan http://java-monitor.com/forum/ [EMAIL PROTECTED] 06-51838192 The secret of success lies in the stability of the goal. -- Benjamin Disraeli - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Threadpool doesn't contain any threads
Dear Praveen, Everyday we are noticing the tomcat not responding on a port. On further inspection we noticed that the thread pool that is serving this port has no threads. Right around the time tomcat goes into this state, we noticed that there is a thread death, and get the following stack trace Does this happen randomly on the day, or at a specific time of day? Is it reproducible on a test machine? What other activity is going on around the time that Tomcat dies? Cron jobs? Backups? Network changes? Did anyone else notice this issue. Another minor caveat is, we built Tomcat using JDK 1.5 but are running it on JDK 1.6. Could this be causing any issue? Hum. You built your own Tomcat? Is there a test environment that you can test this application with a pre-built one from Apache.org? Just to make sure. Also I used Jconsole and noticed that currentThreadBusy and currentThreadCount are both -1. I'm not sure that these figures can be trusted once the thread pool has died. -- Kees Jan http://java-monitor.com/forum/ [EMAIL PROTECTED] 06-51838192 Human beings make life so interesting. Do you know that in a universe so full of wonders, they have managed to invent boredom. Quite astonishing... -- Terry Partchett - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: What does tomcat look like?
Dear Leon, http://images.google.de/images?q=tomcat%20architectureie=utf-8oe=utf-8rls=org.mozilla:en-US:officialclient=firefox-aum=1sa=Ntab=wi Thanks for the help. I had already entered the exact same query earlier today. depends on your desired detail grade. Well, more than what these images give me. I'm looking for a drawing that shows me how connectors, thread pools and executors are wired together. This one comes close, but does not show where Tomcat's subsystems live. http://www.vsj.co.uk/pix/articleimages/apr04/tomcat3.jpg So, that image, with yet more detail. -- Kees Jan http://java-monitor.com/forum/ [EMAIL PROTECTED] 06-51838192 The secret of success lies in the stability of the goal. -- Benjamin Disraeli - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
What does tomcat look like?
Dear All, I am looking for a good architecture drawing of Tomcat. I found lots of text descriptions of what Tomcat looks like internally, but I am looking for a graphical representation. Preferably one that shows internal components such as thread pools and connectors. I found many generic JEE pictures, but they are too abstract. -- Kees Jan http://java-monitor.com/forum/ [EMAIL PROTECTED] 06-51838192 The secret of success lies in the stability of the goal. -- Benjamin Disraeli - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Threadpool doesn't contain any threads
Dear Praveen, And what about my question below? Did anyone else notice this issue. Another minor caveat is, we built Tomcat using JDK 1.5 but are running it on JDK 1.6. Could this be causing any issue? Hum. You built your own Tomcat? Is there a test environment that you can test this application with a pre-built one from Apache.org? Just to make sure. -- Kees Jan http://java-monitor.com/forum/ [EMAIL PROTECTED] 06-51838192 The secret of success lies in the stability of the goal. -- Benjamin Disraeli - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: mysql timeout
Dear Adam, 2 - use something like DBCP to enforce a validation query for the connection from the pool. Does anyone have any feedback/advise on this issue? It appears to be quite common. I am running on Redhat Linux, Tomcat 5.5.26 Perhaps this discussion is useful to you? http://java-monitor.com/forum/showthread.php?t=70 -- Kees Jan http://java-monitor.com/forum/ [EMAIL PROTECTED] 06-51838192 The secret of success lies in the stability of the goal. -- Benjamin Disraeli - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: java.lang.Exception: Socket bind failed: [730048]
Dear Toby, Another thing I have found is that Tomcat slows down when a lot of people are connected and requesting to the DB. My maxActive = '150' for the database and maxThreads = '300'. The task manager doesn't show high CPU usage and there is always atleast 2GB RAM free. Any ideas on why this is happening? DB server is running fine too. In the past, the DB server CPU would be high when this happened, but now that's Not the case. How does the I/O on the box behave? -- Kees Jan http://java-monitor.com/forum/ [EMAIL PROTECTED] 06-51838192 The secret of success lies in the stability of the goal. -- Benjamin Disraeli - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Hard limits in Tomcat?
Dear Leon, Oh, don't be so dramatic. There is a whole world out there of smaller companies that have one or two Tomcat servers in production, running on the cheapest shared server environment they could find. This product targets companies that have two or three developers, one of whom has been pressed into doing the admin role on the side. yes, but why should they give their very sensitive data into the hand of someone? You understand that tomcat operation profile provides perfect opportunity for a potential attacker or competitor? Especially when there are tools which does the same without giving the data away. I see, so you are saying that Tomcat's JMX stats are very sensitive. Is that true in all cases? For each and every running instance of Tomcat? This is basically the same discussion as is currently raging between using internal mail servers and using Google's. I note that both you and I are using Google mail. Some company policies forbid the use of external mail systems precisely for the reasons you suggest. I've even worked at companies that firewalled hotmail.com to keep their employees off of it. Other companies decide to outsource all of their mail services to Google for the convenience and savings it offers. I apologize if the operational model of Java-monitor startled you. That was not my intention. It works this way because that takes the care and feeding of the monitoring platform away from the user. Some people like that while others, such as yourself, prefer not to work like this. Why dont you just supply another web/app which collects the data locally in the customers environment? Well, it's kind'a hard to send out an e-mail message that your app server has died, when the monitor is running inside that very same server. Also, I have plans for rules processing that should help predict server death. I'm not sure everyone will want to have the overhead of such processing in their operational environment. I'm not asking anyone to switch away from their existing tools. I'm certainly not suggesting that you use it, as Java-monitor is clearly not suited for your environment. -- Kees Jan http://java-monitor.com/forum/ [EMAIL PROTECTED] 06-51838192 Human beings make life so interesting. Do you know that in a universe so full of wonders, they have managed to invent boredom. Quite astonishing... -- Terry Partchett - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: How to prevent Tomcat redirect my request
Dear Jim, I deployed a web application foo.war into tomcat 5.x . When I used httpclient to send post request to http://localhost:8080/foo;, I always get the http 302 redirect response . How can I prevent Tomcat to reply redirect response and directly adding the slash to my request url http://localhost:8080/foo/; to get what I want . I see web browser can automcatically resend the request to redirected location but httpclient can not. Is there configurations for that ? Could anyone shed some lights ? I usually use httpunit, not httpclient. The advantage is that it does all the cookies, 302 responses and lord knows what else in the HTTP protocol, allowing me to focus on the logic instead of the protocol. Maybe that's an alternative route for you, if Tomcat cannot be stopped from redirecting your app. -- Kees Jan http://java-monitor.com/forum/ [EMAIL PROTECTED] 06-51838192 Rule 1 for being in a hole: stop digging. - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Hard limits in Tomcat?
Dear Chris, I am setting up a monitoring system for Tomcat servers and I am looking for hard limits in Tomcat servers in general. I found a few so far: file descriptors, memory pools (ok, these are jdk limits) and thread pools. Are there any other hard limits that I can run into? I would call these soft limits, as they can be changed. Ah, sorry for the confusion. I should have asked for limits that are hard at run-time. Thread pool sizes may be editable, but they are fixed once Tomcat runs. What limits are relevant? For instance, Java doesn't allow you to have any method with more than 64k of code. I suppose that's of little consequence to a running JVM, since the code would never be loaded. Yes, I ran into that limit for a generated servlet once. This is not the kind of limit that I am looking for, as it is caught compile-time, not run-time. If you are going to count memory (heap?) and file descriptors, I suppose you could also count CPU time, since that is a limitable resource on *NIX systems. Hmm. It's really only useful if I can monitor both the maximum available time and the used time. I have no idea how I would measure that, even at unix level. It gets even more messy in virtual servers. If you really are talking about soft limits, then you probably also want to see the number of requests accepted but not yet being handled (controlled by the Connector's acceptCount attribute), the number of request processors (is this thread pools above?), the number of connections total/available/used in JDBC connection pools. Ah, that is interesting too: queue fill levels that should under normal circumstances be more or less empty. Much like the ObjectPendingFinalizationCount. Thanks for that. How would I use it, though? In my Tomcat acceptCount has a value of 100. That's probaly an upper limit. What is the 'un-use' property that goes with this upper limit? What MBean can I talk to about JDBC connection pooling? -- Kees Jan http://java-monitor.com/forum/ [EMAIL PROTECTED] 06-51838192 Human beings make life so interesting. Do you know that in a universe so full of wonders, they have managed to invent boredom. Quite astonishing... -- Terry Partchett - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Hard limits in Tomcat?
Dear Leon, I think the question you wanna ask yourself first is, do you want to monitor tomcat or do you want to monitor your application? I want to monitor Tomcat, not the application. I'm using the information to improve the Tomcat monitoring on Java-monitor.com. Currently you can see the memory pools/thread pools/file descriptors and their limits. I was just curious if there are any other pool-like structures inside Tomcat. I'm sure that there are many applications out there that have pools and limits, but Java-monitor works for all Tomcats. -- Kees Jan http://java-monitor.com/forum/ [EMAIL PROTECTED] 06-51838192 The secret of success lies in the stability of the goal. -- Benjamin Disraeli - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Hard limits in Tomcat?
Dear Leon, is there a demo available on the java-monitor.com? sofar i only find a php forum :-) The forum has the monitoring tool built-in. A bit weird at forst, but it makes it really simple to post questions, as you can just post graphs from the tool right on the forum. No need to make screenshots. If you register and log in, the tool shows up. I have not put any screenshots hi-res on-line yet. I have only two hands. :-( I should do that. Here are some low-res ones: http://java-monitor.com/forum/showthread.php?t=123 -- Kees Jan http://java-monitor.com/forum/ [EMAIL PROTECTED] 06-51838192 The secret of success lies in the stability of the goal. -- Benjamin Disraeli -- Kees Jan http://java-monitor.com/forum/ [EMAIL PROTECTED] 06-51838192 Rule 1 for being in a hole: stop digging. - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Hard limits in Tomcat?
Dear Chris, Ah, sorry for the confusion. I should have asked for limits that are hard at run-time. Thread pool sizes may be editable, but they are fixed once Tomcat runs. Gotcha. Hard runtime limits makes a whole lot more sense. Sorry for not jumping to that obvious conclusion. I wasn't trying to be a jerk ;) Don't worry. Better to ask for clarification than to assume. I wish more people would follow your example. If you are going to count memory (heap?) and file descriptors, I suppose you could also count CPU time, since that is a limitable resource on *NIX systems. Hmm. It's really only useful if I can monitor both the maximum available time and the used time. I have no idea how I would measure that, even at unix level. It gets even more messy in virtual servers. I don't see why virtual servers would be trickier: the kernel should be counting beans properly. In terms of getting that information, you need to call getrlimit to see what the limit is. I'm not sure where to get the current resource usage, though. Hmmyeah. We're way off into OS-land here. Virtual servers get esepcially tricky when a few are running on a host and you're in one of them. You may still be able to measure your own cpu usage, but you have no idea at all how much was available. So you can never tell if you're using what is available or not. I run Java- monitor's components on the bare iron for that very reason. So that I can see what uses the cpu and optimise the right places. If you really are talking about soft limits, then you probably also want to see the number of requests accepted but not yet being handled (controlled by the Connector's acceptCount attribute), the number of request processors (is this thread pools above?), the number of connections total/available/used in JDBC connection pools. Ah, that is interesting too: queue fill levels that should under normal circumstances be more or less empty. Much like the ObjectPendingFinalizationCount. Thanks for that. How would I use it, though? In my Tomcat acceptCount has a value of 100. That's probaly an upper limit. What is the 'un-use' property that goes with this upper limit? Do you mean something like a minimum accept count? By definition, the minimum accept count is 0, since you're talking about the number of connections that the socket will accept. It can certainly always be zero. But this is an OS thing, and is set when you bind to the socket. I don't think there's a way to change this through Java after the socket has been bound. Grr. Off into OS-land again. Oh well. :-) What MBean can I talk to about JDBC connection pooling? You should get yourself a copy of LabmdaProbe and basically steal all that code. Better yet, just use LambdaProbe and save yourself a lot of headache. I'm sure they'd appreciate any code you'd like to donate to the project to sniff other limits (like file descriptors). Yes, LambdaProbe sure looks nice. My probe code is available from Google code (http://code.google.com/p/java-monitor-probes/) but really all I do so query JMX mbeans. Hmm. Maybe I should talk to the devs of the new default connection pool to incorporate a pool MBean too. That's useful for all of us, regardless of monitoring tool in use. For Java-monitor I have to keep in mind that I cannot do anything invasive. I want the probe to be so lightweigth that installation is a mere 5 minutes work and has no measurable impact on the JVM's run-time performance. -- Kees Jan http://java-monitor.com/forum/ [EMAIL PROTECTED] 06-51838192 Human beings make life so interesting. Do you know that in a universe so full of wonders, they have managed to invent boredom. Quite astonishing... -- Terry Partchett -- Kees Jan http://java-monitor.com/forum/ [EMAIL PROTECTED] 06-51838192 The secret of success lies in the stability of the goal. -- Benjamin Disraeli - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Hard limits in Tomcat?
Dear Leon, well, downloaded, installed, started, klicked, ... deleted... you should announce that your war is SENDING DATA to the central server in LARGE letters :-) which users are you targeting? No one i know (and i'm in the webapp business for about 10 years) will ever going to use this stuff, since its opposes all security guidelines which exists in the real applications world, without considering if its useful or not. It may sound a bit harsh, but any admin who installs java-monitor webapp on companies server should be fired at once (and probably will be). Oh, don't be so dramatic. There is a whole world out there of smaller companies that have one or two Tomcat servers in production, running on the cheapest shared server environment they could find. This product targets companies that have two or three developers, one of whom has been pressed into doing the admin role on the side. I apologize if the operational model of Java-monitor startled you. That was not my intention. It works this way because that takes the care and feeding of the monitoring platform away from the user. Some people like that while others, such as yourself, prefer not to work like this. Even in large companies, Java-monitor has its place. I spoke to one of my users this week and he tells me that he uses Java-monitor on the test machine because the process of getting JBoss performance statistics out of their hosting company takes days. I like it because I can check the status of my servers from my iPhone. -- Kees Jan http://java-monitor.com/forum/ [EMAIL PROTECTED] 06-51838192 Rule 1 for being in a hole: stop digging. - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Request Logging in Tomcat 6
Dear Raphael, I've been working with performance measurements of web services and I've faced this problem. For each request to my system (running in a tomcat 6) I need to log these information: Received Bytes (request content length) Served Bytes (response content length) Response Time (the time taken by the server to process the request) CPU Time (optional) I/O Time (optional) URI Cookies(the value of some specific cookies) Request Content Data If you need this much detail, best write your own servlet filter and log it yourself. http://www.onjava.com/pub/a/onjava/2001/05/10/servlet_filters.html CPU and I/O times are tricky. If you get that to work, let me know. :-) -- Kees Jan http://java-monitor.com/forum/ [EMAIL PROTECTED] 06-51838192 Human beings make life so interesting. Do you know that in a universe so full of wonders, they have managed to invent boredom. Quite astonishing... -- Terry Partchett - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Request Logging in Tomcat 6
Dear Raphael, I've been working with performance measurements of web services and I've faced this problem. For each request to my system (running in a tomcat 6) I need to log these information: Received Bytes (request content length) Served Bytes (response content length) Response Time (the time taken by the server to process the request) Actually, the latter two are simple: http://java-monitor.com/forum/showthread.php?t=5 -- Kees Jan http://java-monitor.com/forum/ [EMAIL PROTECTED] 06-51838192 The secret of success lies in the stability of the goal. -- Benjamin Disraeli - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Hard limits in Tomcat?
Dear All, I am setting up a monitoring system for Tomcat servers and I am looking for hard limits in Tomcat servers in general. I found a few so far: file descriptors, memory pools (ok, these are jdk limits) and thread pools. Are there any other hard limits that I can run into? -- Kees Jan http://java-monitor.com/forum/ [EMAIL PROTECTED] 06-51838192 The secret of success lies in the stability of the goal. -- Benjamin Disraeli - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Tomcat vs Daemons
Dear Nate, I am porting an application from Windows to Linux which makes heavy use of servlets. I have a fairly intensive background process (currently a windows service) that requires no user interaction. I plan to rewrite the code in Java and I am wondering if there is any notable performance difference between running the Java code under Tomcat as opposed to running the code directly as a daemon. No there is not. Tomcat just handles the HTTP serving part and the processing is done in Java, just as it would it it were a Tomcat-less JVM. Since the application requires Tomcat, I know I can code it up as a servlet and kick off the processing in the init() function and not worry about executing the code directly as a daemon. Since this is a performance sensitive process I want to make sure that I choose the optimal route. Performance is determined by many factors. Does anybody know how java code running as a servlet compares performance-wise to the same code running as a daemon? Is one way generally better than the other? No difference. You'd need something that handler HTTP access to your servlet, so you'd wind up with something like Tomcat anyway. I think you have a strange idea of what a daemon is. After all, most of us run Tomcat as a daemon. -- Kees Jan http://java-monitor.com/forum/ [EMAIL PROTECTED] 06-51838192 The secret of success lies in the stability of the goal. -- Benjamin Disraeli - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Tomcat request processing gets stuck
Deear Michal, When i checked the tomcat using jconsole i see that the object RequestProcessor accumulates to many objects which i guess may show the cause of this problem. Uhm. Could you explain what you mean here? I don't understand what you are trying to say. You see too many request processors? How many? What is the maximum and the expected number? -- Kees Jan http://java-monitor.com/forum/ [EMAIL PROTECTED] 06-51838192 The secret of success lies in the stability of the goal. -- Benjamin Disraeli - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Tomcat Hanging Intermittently
Dear Gaurav, I have tomcat server with apache (mod_jk) and mysql running on my box. Initially there were no issues with the server. But from past one month, the tomcat application hangs and websites also doesn't open. Though when i run nmap localhost, it shows me 8080 and ajp13 services running. You could try to make a thread dump to see what Tomcat is doing. Any errors in the logs that you did not expect? I have notices that in last 1 month serveral websites have been hosted on the box. Earlier around 6-10 websites were hosted but now it has increased to 20. Is it putting load on the server. Virtual server, or actual iron? I am facing another issue. Most of the websites have .war files deployed, so whenever i restarts the tomcat, it takes 90 seconds to start the tomcat. Time duration has also incereased as the no. websites have increased. Kindly provide me some solution so that i don't have to face any downtime in future. Well, you can start by installing multiple instances of Tomcat and placing a few sites in each. If you have the memory I would probably aim for having one Tomcat instance per handful of web application (as long as they are not inter-dependent). Then use Apache to route the traffic to the right application. That way, if one appliction screws up you don't have to restart the whole Tomcat server, just the one instance. -- Kees Jan http://java-monitor.com/forum/ [EMAIL PROTECTED] 06-51838192 Rule 1 for being in a hole: stop digging. - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Logging Tomcat errors
Dear Peter, I guess it should be easy enough to distinguish between severe errors and ordinary errors, but how do you distinguish between 500 errors application runtime errors? I specifically want to report errors that occur at the container level and not at the application level... I hope this makes sense. Each logged line has an associated categry. You could configure your logging to only log the container level categories. -- Kees Jan http://java-monitor.com/forum/ [EMAIL PROTECTED] 06-51838192 Human beings make life so interesting. Do you know that in a universe so full of wonders, they have managed to invent boredom. Quite astonishing... -- Terry Partchett - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Debian + Apache 2.2 + Tomcat 5.5
Dear Alex, The debian Tomcat package is notoriously hard to use. In your shoes I would switch to a normal Tomcat server from apache.org. In /usr/share/tomcat5.5-webapps/ I move the folder ROOT to ROOT_BACK and move my App folder shop_v1 to ROOT After that and a restart of Tomcat... nothing will be browseable.. not index.jsp nor test.jsp within ROOT with simple hello... The message HTTP 404 The requested resource (/) is not available. Try /index.jsp and see if that works. If it does, check the welcome file list in your web.xml. -- Kees Jan http://java-monitor.com/forum/ [EMAIL PROTECTED] 06-51838192 Human beings make life so interesting. Do you know that in a universe so full of wonders, they have managed to invent boredom. Quite astonishing... -- Terry Partchett - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Change Tomcat's bind address?
Dear Søren, How do i change Tomcat 6's bind address? http://java-monitor.com/forum/showthread.php?t=32 -- Kees Jan [EMAIL PROTECTED] 06-51838192 Rule 1 for being in a hole: stop digging. - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Apache 6.0.16
Dear Dan, Yes it works with apache-tomcat.5.5.25, the port comes up and listens on Port 8005. I can stop and start at will, no problem. The installation I have is 6.0.16, no mods to server.xml and this is one that throws the error. Strange. When I try a stock 6.0.16, freshly downloaded from apache.org the error message is eerily similar if something is listening on port 8005 already. Apart from the German message, of course. Nov 13, 2008 9:21:13 PM org.apache.catalina.core.StandardServer await SEVERE: StandardServer.await: create[8005]: java.net.BindException: Address already in use at java.net.PlainSocketImpl.socketBind(Native Method) at java.net.PlainSocketImpl.bind(PlainSocketImpl.java:359) at java.net.ServerSocket.bind(ServerSocket.java:319) at java.net.ServerSocket.init(ServerSocket.java:185) at org.apache.catalina.core.StandardServer.await(StandardServer.java: 373) at org.apache.catalina.startup.Catalina.await(Catalina.java:642) at org.apache.catalina.startup.Catalina.start(Catalina.java:602) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun .reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java: 39) at sun .reflect .DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java: 25) at java.lang.reflect.Method.invoke(Method.java:585) at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:288) at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:413) Are yu absolutely sure that nothing is listening on port 8005 when you started the 6.0.16 server? You can check using the advise in http://java-monitor.com/forum/showthread.php?t=22 Note that AIX is not in the list of sample commands. Could you let me know afterwards what commands you use on AIX to find out who is listening? It would be nice for future reference. -- Kees Jan http://java-monitor.com/forum/ [EMAIL PROTECTED] 06-51838192 The secret of success lies in the stability of the goal. -- Benjamin Disraeli - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Problem to install APR Tomcat Native Library
Der Torsten, I got it sorted out with ldd as suggested here on the list but it is certainly good to know about truss - thank you! I am curious what performance gain APR has for your application server. Did you do any load tests? If so, could you please publisch the results? -- Kees Jan http://java-monitor.com/forum/ [EMAIL PROTECTED] 06-51838192 Human beings make life so interesting. Do you know that in a universe so full of wonders, they have managed to invent boredom. Quite astonishing... -- Terry Partchett - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Apache 6.0.16
Dear Dan, Thanks for the info, I have verified that my existing Tomcat is offline. My existing Apache Tcat 5.5.25 binds to the port without incident, only the out of the box 6.0.16 is causing the problem, with the identical message as yours. I'm using netstat -an |grep 8005 on AIX, to only list if the port is in use/listening. I've done a 'man netstat' and cannot find the command to list the actual process, still checking AIX commands to see what available. When I issue the ./shutdown.sh and execute the netstat command again, no rows are returned, which would normally indicate the port/ socket is released. Let me reiterate, my existing will come up and bind to the port. Bizarre. Before the server shutdown automatically, I can access the 8080 port and display the Apache splash page. Any thing else to check? No idea, really. Sorry. -- Kees Jan http://java-monitor.com/forum/ [EMAIL PROTECTED] 06-51838192 Human beings make life so interesting. Do you know that in a universe so full of wonders, they have managed to invent boredom. Quite astonishing... -- Terry Partchett - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Using tomcat to hold many open connections.
Dear Uprooter, I'm looking for a server that has to hold many (web services) remote clients for controlling them. I want to do things like sending power off command to a bunch of machines remotely. Building a botnet? :-) The clients are usually windows machines behind firewalls NAT or web proxies that only allow HTTP (this is why I thought of webservices) The regular request-response fashion that servlet follows is not suitable here since the initiator of the operation is the server. What can I do in order to solve this and still use web services? If you have the resources, you can just block in the servlet on your server. It's pretty expensive since Tomcat uses a thread per request I believe. Java threads are expensive (256kB each?), so that adds up quickly. You could spend some time tuning your thread stacks, though. Depending on your actual number of clients, you should be able to get this to work with a few GB of RAM. But then, 20K client polling once an hour might be cheaper. You may want to find a way to stagger the requests though. -- Kees Jan http://java-monitor.com/forum/ [EMAIL PROTECTED] 06-51838192 The secret of success lies in the stability of the goal. -- Benjamin Disraeli - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Another confused person trying to get jconsole to monitor tomcat.
Dear Martin, http://www.jdocs.com/tomcat/6.0.14/org/apache/catalina/ServerFactory.html ServerFactory.getServer() will return org.apache.catalina.ServerFactory Thanks for the information. I changed the mbean server code to make use of all available mbean servers and now my code can always see Tomcat's mbeans as well as the platform ones. Excellent. -- Kees Jan http://java-monitor.com/forum/ [EMAIL PROTECTED] 06-51838192 Rule 1 for being in a hole: stop digging. - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: problem in running Jconsole remotely --Connection refused
Dear Subhrajyoti, I am facing problem in running Jconsole remotely . In my machine from where I am running Jconsole I have jdk1.6...I am trying to connect to TOmcat6.0.18 running on a windows 2003 server machine(with JDK 1,5) ...I have a batch file with the following contents : When I execute the batch file Tomcat is starting okay. But when I am trying to run Jconsole to connect to the Tomcat , I am always getting a connection refused error. I think I have set up the parameters correctly here ? Apart from this all the .bat files that comses bundled with Tomcat6.0.18 are kept same. I can ping the server from my machine without any problem . JConsole remotely is a problem. Recently I have started work on an on- line monitoring tool that allows you to monitor memory and threads without any firewall trickery. If you register at http://java-monitor.com, you can download a small WAR file (~35kB) that will collect the memory stats. Read more on http://java-monitor.com/install.html Oh, it also does thread deadlock detection, but that's just a freebie. ;-) -- Kees Jan http://java-monitor.com/forum/ [EMAIL PROTECTED] 06-51838192 The secret of success lies in the stability of the goal. -- Benjamin Disraeli - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Another confused person trying to get jconsole to monitor tomcat.
Dear Mark, I got bitten by this recently. I am working on a LifecycleListener (that can be configured in server.xml) that fixes both ports that are used by jconsole. This makes it much easier to configure firewalls, tunnel through PuTTY etc. If I get it finished in time, it will be in 6.0.19+. If not, a later version. Keep an eye on the change log and/or the dev list. Since you are knowledgeable in the sources for Tomcat, are you aware of any programmatic way to register the Catalina mbeans? I'd like to do so from code, without specifying any command line options. For JBoss I found a special JMXserver class that I can load using reflection. Is there such a thing for Tomcat? -- Kees Jan http://java-monitor.com/forum/ [EMAIL PROTECTED] 06-51838192 The secret of success lies in the stability of the goal. -- Benjamin Disraeli - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: How do you have your dev environment setup?
Dear All, I've been doing a lot of webapp development on tomcat, but currently my process is all manual. I write the code in Eclipse, and then copy the appropriate files over to tomcat. I'd like to automate and standardize my process. So would y'all mind explaining how your dev environment is configured? I'd appreciate the insight. TIA. I develop in Eclipse and rsync the files over to my test box. Passwordless ssh and a little script. -- Kees Jan http://java-monitor.com/forum/ [EMAIL PROTECTED] 06-51838192 Rule 1 for being in a hole: stop digging. - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Tomcat 5.5.26 OutOfMemoryError -Xms -Xmx Set
Dear Tom, I'd like to confirm that I am trying the right things in fixing a memory error and discover what else I can do to resolve my problem. I realise this is a common problem as I have Googled, read the Tomcat memory FAQ and searched the mailing lists. I have tried looking at catalina.out however I am not a java programmer. Here is a quick-start memory tuning guide I wrote earlier. http://java-monitor.com/forum/showthread.php?t=30 Basically, you have to find and tune the right memory pool. Use jconsole to see what memory pool fills up. Hope this helps. -- Kees Jan http://java-monitor.com/forum/ [EMAIL PROTECTED] 06-51838192 Human beings make life so interesting. Do you know that in a universe so full of wonders, they have managed to invent boredom. Quite astonishing... -- Terry Partchett - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Custom error page with stacktrace
Dear All,
In your error page, the variable exception is set to the exception
(if any). You can get the error message and stack trace from the
exception like this:
pException message: %= (exception == null) ? :
exception.getMessage() %/p
%
String stStack = ;
if (exception != null) {
java.io.StringWriter sw = new java.io.StringWriter();
exception.printStackTrace(new java.io.PrintWriter(sw));
stStack = sw.toString();
}
%
pStack trace:/p
pre
%= stStack %
/pre
You can make this even more readable by using the individual stack
trace elements instead of the string writer. That way you can give
those lines that have your own classes a different colour. What I do
is show my own classes in bold red in the stack trace. That way I know
what code to check faster.
Check out
http://java.sun.com/javase/6/docs/api/java/lang/Throwable.html#getStackTrace()
--
Kees Jan
http://java-monitor.com/forum/
[EMAIL PROTECTED]
06-51838192
Rule 1 for being in a hole: stop digging.
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Re: Tomcat ignores the missing JDBC DataSource reference in web.xml
Dear Gennady, My web.xml descriptor missing reference to JDBC data source defined in context.xml (resource-ref section), but web application runs just fine and pooled data source consumed by hibernate. Same here. I read somewhere that the tutorials are wrong and the this is the way it's supposed to work. Sorry, no link. -- Kees Jan http://java-monitor.com/forum/ [EMAIL PROTECTED] 06-51838192 The secret of success lies in the stability of the goal. -- Benjamin Disraeli - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: override 100-continue response in servlet
Dear Craig, I'm writing a servlet to allow large-file uploads (with ranges and resume). One issue I noticed was that if the range is invalid (I do the checks in doPut), and I return a 416, the client (curl in this case) continues to upload the body (possibly gigabytes of data that will be discarded) because tomcat already sent the 100-continue. Ah. Rebuilding FTP? :-) Maybe I could just force the connection to close somehow, but I'd like to respond with the 416 instead of tomcat's immediate 100- continue. Is there a way to override the 100-continue behaviour so I can perform the checks and return 100 or 416 myself? You could use a servlet-filter to do the checks earlier? Other that that, you're looking at hacking Tomcat itself. If not, how could I force the connection to close immediately? response.getOutputStream().close() ? -- Kees Jan http://java-monitor.com/forum/ [EMAIL PROTECTED] 06-51838192 The secret of success lies in the stability of the goal. -- Benjamin Disraeli - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Another confused person trying to get jconsole to monitor tomcat.
Dear Bill, I've been through the docs. I've been through Google. I can't seem to figure this out. Server: Tomcat 6.0.18, JDK: 1.6.0_07, Redhat Server 5.2 Client: jconsole from JDK 1.6.0_07 on Windows XP I've got all of these in $CATALINA_OPTS and they do show up in the java command line when I run ps: -Dcom.sun.management.jmxremote -Dcom.sun.management.jmxremote.port=12345 -Dcom.sun.management.jmxremote.ssl=false -Dcom.sun.management.jmxremote.authenticate=false The Redhat server is running iptables and disallows most things that aren't 80/443. Any other ports that are needed are generally opened up only to specific IP's. I've opened up the JMX port specified above on the Linux firewall: iptables -A INPUT -s myClientsIp -p tcp -m tcp --dport 12345 -j ACCEPT I run jconsole: C:\PathToJava\binjconsole myServer.myDomain.com:12345 It can't make the connection. I've got a feeling it's something to do with the firewall. I've seen some stuff that suggests that there's another unspecified port opened up but it didn't really make sense to me. Note that the server and the client are at different facilities connected over the internet which is why I eventually want to get it going with authentication and SSL but I can't even get this simple insecure version of the connection to work. I just spent a few hours trying to figure this out myself. The problem you are facing is that RMI uses dynamic port allocation. The port you are specifying is that of the RMI registry, which only acts as a naming service. The actual JMX port is dynamically chosen by the RMI registry, so opening a single port on the firewall does not actually help. The simple case will never work for your environment. You have to go SSL for this to even work. Here is a blog post by Daniel Fuchs with a step-by-step for ssl and single port RMI http://blogs.sun.com/jmxetc/entry/jmx_connecting_through_firewalls_using In the end I just gave up and I now open the firewall between my dev machine's IP and the test machine's IP when I need jconsole. I have better things to do with my time than fight RMI. :-/ -- Kees Jan http://java-monitor.com/forum/ [EMAIL PROTECTED] 06-51838192 Human beings make life so interesting. Do you know that in a universe so full of wonders, they have managed to invent boredom. Quite astonishing... -- Terry Partchett - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Disabling catalina.out log
Dear Emerson, Truncating? It should be a rolling file, rolling over daily. You can just remove the old versions. Is this a stock tomcat, one from the ports, or maybe a particularly old one? catalina.out is set at the catalina.sh: $CATALINA_BASE/logs/catalina.out 21 This file is not rateable, as it is jsut a redirection. You are right. Woops, I thought it was a rotatable file. Maybe I restart my Tomcats too often. :) We are thinking in moving this redirection to /dev/null or just remove the redirection. Is it a sense thing to do? To get rid of an ever-growing file, yes. However, you have to make really sure that you still get all the stack traces and whatnot that is in that file, only get them into a rolling file. A. Wait. Now I know why I never run into this. I run my Tomcats in screen using catalina.sh run, so catalina.out is written to the console instead of a file. I do get a nice daily log e.g. catalina. 2008-08-20.log. That would mean it is safe to redirect catalina.out to /dev/null, as long as you have the daily logs. -- Kees Jan http://java-monitor.com/forum/ [EMAIL PROTECTED] 06-51838192 Human beings make life so interesting. Do you know that in a universe so full of wonders, they have managed to invent boredom. Quite astonishing... -- Terry Partchett - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Disabling catalina.out log
Dear Irwan Hadi,
Just curious if anybody knows how to disable tomcat from logging to
catalina.out, possibly by editing the server.xml file?
check out ${tomcat}/conf/logging.conf
True that we can link catalina.out to /dev/null or truncate the file
every
now and then, but we prefer to use a more sane approach, than just
truncating the file...
Truncating? It should be a rolling file, rolling over daily. You can
just remove the old versions. Is this a stock tomcat, one from the
ports, or maybe a particularly old one?
The most sane approach would be to work with your developers to have
some logging policy that both you and the developers can work with.
You'll need at least the exception traces when Tomcat dies, or you're
blind.
But then, there is nothing like saving a few bucks in disk space at
the expense of hours of blind debugging. :-)
--
Kees Jan
http://java-monitor.com/forum/
[EMAIL PROTECTED]
06-51838192
Human beings make life so interesting. Do you know that in a universe
so full of wonders,
they have managed to invent boredom. Quite astonishing... -- Terry
Partchett
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Re: Tomcat monitoring
Dear Tokajac, As far as I see http://www.zabbix.com http://www.zabbix.com is not available for WinXP (that's my platform). *shrug* You could always run it on FreeBSD or Linux in VMWare. I downloaded Zapcat. Can Zapcat be useful without zabbix? No, it only works as a bridge to Zabbix. That's what it was designed to do. Here is a discussion about some other tools that you can use to monitor your VM. http://java-monitor.com/forum/showthread.php?t=1 There is also Zenoss and MC4J. Hope this helps. -- Kees Jan http://java-monitor.com/forum/ [EMAIL PROTECTED] 06-51838192 Human beings make life so interesting. Do you know that in a universe so full of wonders, they have managed to invent boredom. Quite astonishing... -- Terry Partchett - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Tomcat monitoring
Dear Tokajac, I want to monitor performance of Tomcat server when I'm running an application. Memory usage, threads, objects, user sessions, sql queries and as much as possible of other information on server. JMX is the way to go. JConsole was already suggested. If you want to really monitor the performance of an application you also need information from the actual host (disk I/O load, network load, processor load, RAM fill level. You should consider that tools such as JConsole only show data that is gathered as long as JConsole is running. External monitoring tools also allow you to gather information continuously, across reboots and new software versions. That gives you the ability to 1) do long term resource requirements prediction and 2) see what version of your application introduced or solved the memory leak. :) There are loads of tools out there that can do this. Personally, I use http://www.zabbix.com , combined with the Zapcat JMX to Zabbix bridge (http://www.kjkoster.org/zapcat/Tomcat_How_To.html ). -- Kees Jan http://java-monitor.com/forum/ [EMAIL PROTECTED] 06-51838192 Human beings make life so interesting. Do you know that in a universe so full of wonders, they have managed to invent boredom. Quite astonishing... -- Terry Partchett
