RE: Tomcat dependency on application server

2014-05-16 Thread Randhir Singh 
Thanks Chris for your answer. There were separate PID's on Linux for JBoss &
Tomcat and I killed the Tomcat process. Would killing a Tomcat process also
kill the JVM process? I had another related question of how to know the
number of JVM's running, I mean the count of the number of JVM's.

I hope, my query has been put across correctly.

Requesting a reply.

Regards

-Original Message-
From: Christopher Schultz [mailto:ch...@christopherschultz.net]
Sent: Saturday, May 17, 2014 1:59 AM
To: Tomcat Users List
Subject: Re: Tomcat dependency on application server

-BEGIN PGP SIGNED MESSAGE-
Hash: SHA256

Randhir,

On 5/15/14, 3:17 AM, Randhir Singh wrote:
> Hi,
>
> We have JBoss as the application server & Tomcat as the web server in
> our production & developmental setup which is on Red Hat Linux 5.X. We
> have tomcat 6.X. My query is that if I need to restart tomcat, do I
> need to restart JBoss & Tomcat both or just restarting Tomcat would be
> enough. I am asking this query because I had killed the tomcat process
> using kill -9 and while restarting tomcat it was not starting but when
> I killed JBoss & tomcat and then restarted, Tomcat was up.
>
> I hope my query is clear whether Tomcat is dependent on JBoss.

I'm fairly sure that there is only a single JVM for JBoss/Tomcat. If you
killed one, you've killed the other.

- -chris
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Re: Session fixation & Tomcat 7

2014-05-16 Thread Terence M. Bandoian 

On 5/8/2014 8:56 PM, Akash Jain wrote:

Hi,

I am trying to resolve session fixation issue with tomcat 7.0.52

We have a Spring MVC application running on it, and the Auth method is
provided by another application which writes cookie, and we use the cookie
value to check whether the user is valid or not.

My application URL patterns are
/ - Home page
/login - Redirect to another application to ask user to authenticate
/myaccess/user*** --> All authenticated URL's



As I cannot use org.apache.catalina.authenticator.FormAuthenticator here.

How can i prevent the session fixation ?

Thanks.



Do all communications use SSL or TLS?

-Terence Bandoian


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Re: Slow execution of Tomcat 7.0.52 due to coarse lock in WebappClassLoader.loadClass

2014-05-16 Thread Mark Thomas 
On 14/05/2014 17:58, Sebastien Tardif wrote:
> I'm having some visible performance issue related to the use of method 
> synchronized loadClass(String name, boolean resolve) in WebappClassLoader
> 
> I see that the author or least some of the author(s) of the class got the 
> idea in other cases of a more specialize lock that against the entire 
> instance.
> 
> Should we just lock here using the name of the class we are looking for?

No. It is far from being that simple.
http://svn.apache.org/viewvc?view=revision&revision=927565

Mark


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Re: Comet Servlet with a reverse proxy in front of it

2014-05-16 Thread Elias Kopsiaftis 
Here is my config for using nginx as a reverse proxy in front of tomcat.
Seems to work so far. Just replace the question marks with your
configuration


 server {
listen 80;
server_name ??;
root /var/lib/tomcat7/webapps/?.

location / {
proxy_http_version 1.1;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header X-Forwarded-Proto $scheme;
proxy_pass http://127.0.0.1:8085/;
}




On Thu, May 15, 2014 at 1:04 PM, Elias Kopsiaftis  wrote:

> Hey,
>
> I actually got this working so far with nginx(and by so far I mean the
> random connection errors I was getting with apache2 have not surfaced yet).
>
> Ill post the nginx config setup later today when I get home for the
> benefit of anyone else who wants to do this.
>
>
> On Mon, May 12, 2014 at 3:34 PM, Christopher Schultz <
> ch...@christopherschultz.net> wrote:
>
>> -BEGIN PGP SIGNED MESSAGE-
>> Hash: SHA256
>>
>> Elias,
>>
>> On 5/12/14, 11:20 AM, Elias Kopsiaftis wrote:
>> > Is there any way to put a reverse proxy in front of a Comet
>> > servlet?
>>
>> I don't believe so. There is work being done on supporting Websocket
>> through mod_proxy but it will likely never support Comet.
>>
>> > I tried apache but thats a no go because it uses a single thread
>> > per connection, which is not scaleable
>>
>> Only some Apache httpd MPMs are one-thread-per-connection.
>>
>> > then I tried nginx, which perhaps I did something wrong in my
>> > setup but in the client code, the call to getInputStream never
>> > returns, indicating something is wrong. I apologize for not
>> > providing too many details and just proposing a general question,
>> > but Im hoping there is a general solution to this problem. If you
>> > guys needs server specific details I can provide later today when I
>> > get home from work.
>>
>> I think that httpd + Tomcat is not going to work, here. I'm not sure
>> about Nginx. If you find something that works, please post back with
>> your findings.
>>
>> - -chris
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>

Re: Compiling mod_jk in CentOs release 6.5

2014-05-16 Thread Christopher Schultz 
-BEGIN PGP SIGNED MESSAGE-
Hash: SHA256

Shailesh,

On 5/16/14, 1:57 PM, J Java wrote:
>>> There's no reason to read some "how to guide" on the Internet
>>> for how to build mod_jk: the building steps come with the
>>> source package, and they are up-to-date instead of some guy's
>>> blog that requires root privileges to run properly.
> 
> Chris.
> 
> completely agree. But what you can do when if those up-to-date
> steps are are not helping you out?

Ask here? You can get a pretty good response time with a well-asked
question.

> Also, some guy's step definitely helped me achieve waht i wanted
> to (building and settingup mod_jk) out and thats what is important
> I guess than who has written it or how he advises to do it.
> Anyway..it was just a suggestion. no advise

- -chris

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Re: where find documentation

2014-05-16 Thread Terence M. Bandoian 

On 5/15/2014 8:05 AM, Francesco Viscomi wrote:

Hi all,
i'm try to find a documentation that describe every tag inside the web.xml
file, but i wasn't able to find anything about that on
http://tomcat.apache.org/tomcat-5.5-doc/config/context.html


someone can help me?
thanks in advance;
Francesco
Italy



Which version of Tomcat are you using?  Your link above is for 5.5. Go to:

http://tomcat.apache.org/

for links to documentation for other versions of Tomcat.

web.xml is documented in the servlet specifications.  Links to servlet 
specifications may be found on the Tomcat wiki:


http://wiki.apache.org/tomcat/Specifications

Hope that helps.

-Terence Bandoian

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Re: where find documentation

2014-05-16 Thread Christopher Schultz 
-BEGIN PGP SIGNED MESSAGE-
Hash: SHA256

Francesco,

On 5/16/14, 10:01 AM, Арсений Зинченко wrote:
> I used this one:
> 
> http://wiki.metawerx.net/wiki/Web.xml
> 
> 
> 2014-05-15 16:05 GMT+03:00 Francesco Viscomi :
> 
>> Hi all, i'm try to find a documentation that describe every tag
>> inside the web.xml file, but i wasn't able to find anything about
>> that on 
>> http://tomcat.apache.org/tomcat-5.5-doc/config/context.html
>> 
>> 
>> someone can help me? thanks in advance; Francesco Italy

There's always the servlet specification itself. There is a reference
at the end that covers most -- but not all - of the elements. There is
also a significant amount of documentation in the XML schemas. You
should check those out, too.

- -chris
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Re: Slow page response time in tomcat 8.0.5

2014-05-16 Thread Mark Thomas 
On 15/05/2014 18:04, Hariprasad Manchi wrote:
> Hi,
> We are trying to use apache-tomcat 8.0.5 for our web application and have
> encountered performance issue with respect to the page response time.
> However, once the application is deployed in 8.0.5 we see a longer delay in
> response time from the server for the login page itself. With older version
> of tomcat i.e., tomcat 7.x(7.0.53), 6.x(6.0.18) we did not see such delay.
> 
> We have 270 custom tags defined across 6 tld files in our application and
> have the tag pooling feature turned off in conf/web.xml (enablepooling is
> set to false; since this is a requirement for the application we had to
> turn it off).
> 
> We tried to root cause the issue and used fidller tool to monitor the
> requests and response times. The browsers - both IE 11 and Chrome - were
> firing the requests quickly but were waiting for the response from the
> server. We do not know what is the actual cause for this delay. We have
> captured the traffic for both IE and Chrome and could send them if needed.
> 
> Could you please advise how to proceed to identify the root cause for this
> delay? Or could you confirm this as already a known issue?
> 
> Any help would be highly appreciated.
> 
> We are not clear to which group the question should be posted, hence
> sending this email to both users and taglib-users email list.

Get a profiler. Profile what your application is doing.

Mark


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Re: Application monitoring

2014-05-16 Thread Christopher Schultz 
-BEGIN PGP SIGNED MESSAGE-
Hash: SHA256

David,

On 5/16/14, 11:12 AM, David kerber wrote:
> On 5/15/2014 9:57 AM, Leon Rosenberg wrote:
>> Hello David,
>> 
>> I will not ask you why you are reinventing the wheel (ok, I lied,
>> why are you reinventing the wheel?). You have multiple options
>> available: 1) You could use jmx and publish your information as
>> jmx beans. 2) You could use rmi between you 'collector' and the
>> target apps. 3) You could use simple http (preferably json), but
>> in that case I would advice to setup a separate collector for
>> it.
>> 
>> For any of the above options there are numbers of classes and 
>> utilities you can use. For example jersey as jax-rs
>> implementation is perfect for exchange of json data, for rmi you
>> could use DistributeMe ( http://www.distributeme.org) or
>> spring-remote, and so on.
>> 
>> But yet again, why reinventing the wheel?
> 
> I'm not trying to.  Your responses above are the exact kinds of 
> information I was looking for:  how to communicate between my app
> that displays the information, and the monitored apps.
> 
> Now I just need to look into how to use jmx, rmi and json to figure
> out which will serve my needs the best.  My goal here is to be able
> to click on a browser bookmark and after logging in, have all the
> information from these dozen apps displayed in an organized table,
> so I don't have to do anything more than scroll down the page to
> see them all.
> 
> They are all OS-agnostic, I presume?

I've done a presentation about how to do this with JMX. Since you are
using a persistent server that is already running Java, you could
maintain a persistent JMX connection with each of the servers to
monitor, and so some of the tools mentioned within are probably less
relevant, but here it is:
http://people.apache.org/~schultz/ApacheCon%20NA%202014/Monitoring%20Apache%20Tomcat%20with%20JMX.pdf

That will show you what information you can get from Tomcat (e.g.
request counts) as well as how to publish whatever information you
want to make available from your own web application.

If you write something cool, consider sticking it up on the wiki or
something.

- -chris
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Re: Tomcat dependency on application server

2014-05-16 Thread Christopher Schultz 
-BEGIN PGP SIGNED MESSAGE-
Hash: SHA256

Randhir,

On 5/15/14, 3:17 AM, Randhir Singh wrote:
> Hi,
> 
> We have JBoss as the application server & Tomcat as the web server
> in our production & developmental setup which is on Red Hat Linux
> 5.X. We have tomcat 6.X. My query is that if I need to restart
> tomcat, do I need to restart JBoss & Tomcat both or just restarting
> Tomcat would be enough. I am asking this query because I had killed
> the tomcat process using kill -9 and while restarting tomcat it was
> not starting but when I killed JBoss & tomcat and then restarted,
> Tomcat was up.
> 
> I hope my query is clear whether Tomcat is dependent on JBoss.

I'm fairly sure that there is only a single JVM for JBoss/Tomcat. If
you killed one, you've killed the other.

- -chris
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Re: Compiling mod_jk in CentOs release 6.5

2014-05-16 Thread J Java 
>> There's no reason to read some "how to guide" on the Internet for how
to build mod_jk: the building steps come with the source package,
 and they are up-to-date instead of some guy's blog that requires root
privileges to run properly.

Chris.

completely agree. But what you can do when if those up-to-date steps are
are not helping you out?
Also, some guy's step definitely helped me achieve waht i wanted to
(building and settingup mod_jk) out and thats what is important I guess
than who has written it or how he advises to do it. Anyway..it was just a
suggestion. no advise

Thanks,
Shailesh




On Wed, May 7, 2014 at 10:14 PM, Christopher Schultz <
ch...@christopherschultz.net> wrote:

> -BEGIN PGP SIGNED MESSAGE-
> Hash: SHA256
>
> To whom it may concern,
>
> On 5/3/14, 4:10 AM, J Java wrote:
> > /configure
> >> --with-apxs=/usr/lib64/httpd/modules
> >>
> >>
> >> whenever I run above I keep getting this:
> >>
> >> configure: error: You must specify a valid --with-apxs path
> >>
> >> Any ideas why I am getting this error?
> >
> > - --with-apxs needs to be given the full path to the apxs program
> > (in httpd-devel package). So, if it's in /usr/lib64/httpd/modules
> > (which it shouldn't be), then you need to say:
> >
> > $ ./configure --with-apxs=/usr/lib64/httpd/modules/apxs
> >
> > On my Amazon Linux system (which is RHEL-compatible, which should
> > obviously be fairly similar to CentOS), apxs is in /usr/sbin/apxs
> >
> >
> >>> PFB link which gives  some shell scrpt to compile mod_jk on
> >>> CENTOS. I am
> > not a shell script expert but what I found in this script is using
> > below line (which includes path to aspx) to configure aspx:
> >
> > http://www.cafe-encounter.net/p1086/build-mod_jk-for-centos
> >
> > ./configure --with-apxs=/usr/sbin/apxs
> >
> > So why dont you try to use this path instead of
> > /usr/lib64/httpd/modules/apxs
>
> There's no reason to read some "how to guide" on the Internet for how
> to build mod_jk: the building steps come with the source package, and
> they are up-to-date instead of some guy's blog that requires root
> privileges to run properly.
>
> - -chris
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>

Re: tomcat6 thread locked

2014-05-16 Thread Christopher Schultz 
-BEGIN PGP SIGNED MESSAGE-
Hash: SHA256

devoss,

Exact Tomcat version? OS and version? Java version?

On 5/15/14, 12:00 PM, devoss ind wrote:
> On 7 May 2014 17:37, "devoss ind"  wrote:
>> 
>> Hi,
>> 
>> Am using tomcat 6, java6 in production environment to run our
>> web
> application. We found that recently, cpu in top is showing 100%
> nearly. Then we dig into each thread cpu usage by -H option in top.
> We found only one thread is taking 100%usage and identified the
> thread using thread dump. The thread dump for that particular
> thread which is using 100% usage is as follows...
>> 
>> "http-8080-exec-3687" daemon prio=10 tid=0x7336f400 nid=0x41a1
>> runnable
> [0x619ad000..0x619ade30]
>> java.lang.Thread.State: RUNNABLE at
> org.apache.coyote.http11.InternalNioOutputBuffer.addToBB(InternalNioOutputBuffer.java:616)
>>
> 
- - locked <0x967b22f0> (a
> org.apache.coyote.http11.InternalNioOutputBuffer)
>> at
> org.apache.coyote.http11.InternalNioOutputBuffer.commit(InternalNioOutputBuffer.java:608)
>>
> 
at
> org.apache.coyote.http11.Http11NioProcessor.action(Http11NioProcessor.java:1024)
>>
> 
at org.apache.coyote.Response.action(Response.java:183)
>> at org.apache.coyote.Response.sendHeaders(Response.java:379) at
> org.apache.catalina.connector.OutputBuffer.doFlush(OutputBuffer.java:305)
>>
> 
at
> org.apache.catalina.connector.OutputBuffer.flush(OutputBuffer.java:288)
>>
> 
at
> org.apache.catalina.connector.Response.flushBuffer(Response.java:548)
>>
> 
at
> org.apache.catalina.core.StandardHostValve.status(StandardHostValve.java:345)
>>
> 
at
> org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:144)
>>
> 
at
> org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
>>
> 
at
> org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
>>
> 
at
> org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:286)
>>
> 
at
> org.apache.coyote.http11.Http11NioProcessor.process(Http11NioProcessor.java:879)
>>
> 
at
> org.apache.coyote.http11.Http11NioProtocol$Http11ConnectionHandler.process(Http11NioProtocol.java:719)
>>
> 
at
> org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:2080)
>>
> 
at
> java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
>>
> 
at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
>>
> 
at java.lang.Thread.run(Thread.java:619)
>> 
>> We can see that above thread is locked due to some problem in
>> NIO.
>> 
>> We have verified in tomcat manager also for such thread. We found
>> that a
> particular thread is taking 14140517ms time and the request in that
> line is of POST request which is not related to our application.
>> 
>> That particular thread is not releasing till we restart tomcat.
>> 
>> This is happening frequently.
>> 
>> Please help me to find out the root cause of this problem. How to
>> avoid
> restarts.
>> 
>> Our server.xml connector configuration is as follows...
>> 
>>  protocol="org.apache.coyote.http11.Http11NioProtocol"
>> connectionTimeout="5000" acceptCount="1500" maxThreads="1" 
>> redirectPort="8443" />
>> 
>> Please help in this thread locking problem.
>> 
> 
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"NoClassDefFoundError: org/apache/tomcat/util/descriptor/LocalResolver" Error while building project after Tomcat upgrade to 7.0.53 from 7.0.41 !

2014-05-16 Thread Utkarsh Dave 
I am trying to upgrade my Tomcat from 7.0.41 to the latest release 7.0.53
available and the project build failed with below error.

java.lang.NoClassDefFoundError:
org/apache/tomcat/util/descriptor/LocalResolver
at
org.apache.jasper.xmlparser.ParserUtils.(ParserUtils.java:69)
at
org.apache.jasper.compiler.JspConfig.processWebDotXml(JspConfig.java:94)
at org.apache.jasper.compiler.JspConfig.init(JspConfig.java:243)

And same error from multiple places also.
Is this a known issue?

Regards
-Utkarsh

Re: Application monitoring

2014-05-16 Thread David kerber 

On 5/15/2014 9:57 AM, Leon Rosenberg wrote:

Hello David,

I will not ask you why you are reinventing the wheel (ok, I lied, why are
you reinventing the wheel?).
You have multiple options available:
1) You could use jmx and publish your information as jmx beans.
2) You could use rmi between you 'collector' and the target apps.
3) You could use simple http (preferably json), but in that case I would
advice to setup a separate collector for it.

For any of the above options there are numbers of classes and utilities you
can use. For example jersey as jax-rs implementation is perfect for
exchange of json data, for rmi you could use DistributeMe (
http://www.distributeme.org) or spring-remote, and so on.

But yet again, why reinventing the wheel?


I'm not trying to.  Your responses above are the exact kinds of 
information I was looking for:  how to communicate between my app that 
displays the information, and the monitored apps.


Now I just need to look into how to use jmx, rmi and json to figure out 
which will serve my needs the best.  My goal here is to be able to click 
on a browser bookmark and after logging in, have all the information 
from these dozen apps displayed in an organized table, so I don't have 
to do anything more than scroll down the page to see them all.


They are all OS-agnostic, I presume?

Thanks!




regards
Leon



On Wed, May 14, 2014 at 6:28 PM, David kerber  wrote:


I am working on a small Tomcat servlet to monitor other tomcat-based
applications running on the same physical machine, and am trying to figure
out the best way to communicate between the monitoring app, and the
monitored apps.

My setup has several tomcat instances of a single application, each
running from its own directory, and listening on its own TCP port.  So
there is no direct communication between the instances.

I'm trying to monitor various data about the application, not about tomcat
itself or the JVM. So I want to collect such things as the number of
requests it has processed, the last data received, etc, and not things like
memory and cpu usage.  It is my app, so I can (and expect to need to) add
methods or servlets to return the information I want to collect.

My question is, what is the best way to make the request to get the data?
  Would  URL request from the monitoring app to the monitored app be
appropriate, and then parse the response out for display in a browser?  If
so, what java class is likely to be useful for this communication?  I will
have all the information needed to connect to the application instance
(server, port, etc), but want it to be portable across OS types.

Thanks!

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Re: destroySubcontext failing with NameNotFoudException

2014-05-16 Thread Christopher Schultz 
-BEGIN PGP SIGNED MESSAGE-
Hash: SHA256

Ravikiran,

On 5/7/14, 6:12 AM, N, Ravikiran wrote:
> Hi all,
> 
> I trying to understand under what conditions destroySubContext
> fails in tomcat..? I'm trying to destroy Context which I had
> created, because of which I'm unable to createContext the next time
> I start the service. My code is below :
> 
> private Context srvCtx; public void init(ServletConfig
> servletconfig) throws ServletException { Context initCtx = new
> InitialContext(); srvCtx = initCtx.createSubcontext("myapp"); }
> 
> public void destroy() { try { if (srvCtx != null) { 
> srvCtx.destroySubcontext(GS_CTX_NAME); srvCtx.close(); } } 
> catch(NamingException e) { log_.error(new
> LogQueueMessageStructure("Couldn't unbind the context",3016),e); } 
> }
> 
> What is wrong with my code and also how can I debug this issue..?
> Please help me out..!!

Well, first off: your code has insane indentation. That could be it.

An error message or stack trace would be nice.

- -chris
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Re: Slow execution of Tomcat 7.0.52 due to coarse lock in WebappClassLoader.loadClass

2014-05-16 Thread Christopher Schultz 
-BEGIN PGP SIGNED MESSAGE-
Hash: SHA256

Sebastien,

On 5/14/14, 12:58 PM, Sebastien Tardif wrote:
> I'm having some visible performance issue related to the use of 
> method synchronized loadClass(String name, boolean resolve) in 
> WebappClassLoader

Are you loading huge numbers of (distinct) classes over a long period
of time? I wouldn't expect loadClass() to be called very much on a
stable application.

> I see that the author or least some of the author(s) of the class 
> got the idea in other cases of a more specialize lock that against 
> the entire instance.

Examples? The loadClass(String,boolean) method pretty much needs to be
synchronized from start to finish. Perhaps you are right that the
first few lines of he method need not be synchronized, but everything
else does because it will modify the internal state of the class
loader, which is otherwise not thread-safe.

> Should we just lock here using the name of the class we are looking
> for?

Do you mean like synchronized("my class's name")? That won't work, as
the string object you choose to use as a monitor might not be the one
that is being used by other code. Interning strings is quaint, but it
still doesn't solve the problem: the internal state of the ClassLoader
will be modified and it's dangerous to remove synchronization from it.

> My partial threads stack dump:
> 
> 2014-05-14 12:36:01 Full thread dump Java HotSpot(TM) 64-Bit Server
> VM (20.45-b01 mixed mode):
> 
> "http-bio-31680-exec-57" - Thread t@124 java.lang.Thread.State:
> BLOCKED at
> org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1605)
>
> 
- - waiting to lock <264d40df> (a
org.apache.catalina.loader.WebappClassLoader) owned by
"http-bio-31680-exec-41" t@108
> at
> org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1571)
>
> 
at
com.sun.xml.internal.bind.v2.model.nav.ReflectionNavigator.findClass(ReflectionNavigator.java:505)
> ... "http-bio-31680-exec-56" - Thread t@123 java.lang.Thread.State:
> BLOCKED at
> org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1605)
>
> 
- - waiting to lock <264d40df> (a
org.apache.catalina.loader.WebappClassLoader) owned by
"http-bio-31680-exec-41" t@108
> at
> org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1571)
>
> 
at
com.sun.xml.internal.bind.v2.model.nav.ReflectionNavigator.findClass(ReflectionNavigator.java:505)
>  "http-bio-31680-exec-55" - Thread t@122 java.lang.Thread.State:
> BLOCKED at
> org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1605)
>
> 
- - waiting to lock <264d40df> (a
org.apache.catalina.loader.WebappClassLoader) owned by
"http-bio-31680-exec-41" t@108
> at
> org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1571)
>
> 
at
com.sun.xml.internal.bind.v2.model.nav.ReflectionNavigator.findClass(ReflectionNavigator.java:505)
>  Locked ownable synchronizers: - locked <444b3957> (a
> java.util.concurrent.locks.ReentrantLock$NonfairSync)
> 
> "http-bio-31680-exec-54" - Thread t@121 java.lang.Thread.State:
> BLOCKED at
> org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1605)
>
> 
- - waiting to lock <264d40df> (a
org.apache.catalina.loader.WebappClassLoader) owned by
"http-bio-31680-exec-41" t@108
> at
> org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1571)
>
> 
at
com.sun.org.apache.xerces.internal.utils.ObjectFactory.findProviderClass(ObjectFactory.java:358)
>  "http-bio-31680-exec-53" - Thread t@120 java.lang.Thread.State:
> BLOCKED at
> org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1605)
>
> 
- - waiting to lock <264d40df> (a
org.apache.catalina.loader.WebappClassLoader) owned by
"http-bio-31680-exec-41" t@108
> at
> org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1571)
>
> 
at
com.sun.xml.internal.bind.v2.model.nav.ReflectionNavigator.findClass(ReflectionNavigator.java:505)
>  "http-bio-31680-exec-52" - Thread t@119 java.lang.Thread.State:
> BLOCKED at
> org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1605)
>
> 
- - waiting to lock <264d40df> (a
org.apache.catalina.loader.WebappClassLoader) owned by
"http-bio-31680-exec-41" t@108
> at
> org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1571)
>
> 
at
com.sun.xml.internal.bind.v2.model.nav.ReflectionNavigator.findClass(ReflectionNavigator.java:505)
>  "http-bio-31680-exec-51" - Thread t@118 java.lang.Thread.State:
> BLOCKED at
> org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1605)
>
> 
- - waiting to lock <264d40df> (a
org.apache.catalina.loader.WebappClassLoader) owned by
"http-bio-31680-exec-41" t@108
> at
> org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1571)
>
> 
at javax.xml.parsers.FactoryFinder.getProviderClass(FactoryFinder.java:119)
>  "http-bio-31680-e

"NoClassDefFoundError: org/apache/tomcat/util/descriptor/LocalResolver" Error while building project after Tomcat upgrade to 7.0.53 from 7.0.41 !

2014-05-16 Thread Utkarsh Dave 
I am trying to upgrade my Tomcat from 7.0.41 to the latest release 7.0.53
available and the project build failed with below error.

java.lang.NoClassDefFoundError:
org/apache/tomcat/util/descriptor/LocalResolver
at
org.apache.jasper.xmlparser.ParserUtils.(ParserUtils.java:69)
at
org.apache.jasper.compiler.JspConfig.processWebDotXml(JspConfig.java:94)
at org.apache.jasper.compiler.JspConfig.init(JspConfig.java:243)

And same error from multiple places also.
Is this a known issue?

Regards
-Utkarsh

Re: Application monitoring

2014-05-16 Thread Christopher Schultz 
-BEGIN PGP SIGNED MESSAGE-
Hash: SHA256

Mark,

On 5/14/14, 1:41 PM, Mark Eggers wrote:
> On Wed, 14 May 2014 12:28:46 -0400, David kerber wrote:
> 
>> I am working on a small Tomcat servlet to monitor other
>> tomcat-based applications running on the same physical machine,
>> and am trying to figure out the best way to communicate between
>> the monitoring app, and the monitored apps.
>> 
>> My setup has several tomcat instances of a single application,
>> each running from its own directory, and listening on its own TCP
>> port.  So there is no direct communication between the
>> instances.
>> 
>> I'm trying to monitor various data about the application, not
>> about tomcat itself or the JVM. So I want to collect such things
>> as the number of requests it has processed, the last data
>> received, etc, and not things like memory and cpu usage.  It is
>> my app, so I can (and expect to need to) add methods or servlets
>> to return the information I want to collect.
>> 
>> My question is, what is the best way to make the request to get
>> the data?  Would  URL request from the monitoring app to the
>> monitored app be appropriate, and then parse the response out for
>> display in a browser?  If so, what java class is likely to be
>> useful for this communication?  I will have all the information
>> needed to connect to the application instance (server, port,
>> etc), but want it to be portable across OS types.
>> 
>> Thanks!
> 
> http://wiki.apache.org/tomcat/FAQ/Monitoring
> 
> In particular, item 3. Unfortunately, the sample code seems to be 
> missing . . .

Which is "item 3"? I'd be happy to fix whatever is missing.

- -chris
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Re: Slow page response time in tomcat 8.0.5

2014-05-16 Thread Leon Rosenberg 
Hello Hariprasad,

you could embed moskito webui into your application, annotate your tags
with @Monitor and you would see how long they execute and what is the
execution path, which tags are called during an http request how often and
how long they execute. You can follow this link for more information on the
integration:
blog.anotheria.net/msk/the-complete-moskito-integration-guide-step-1/

MoSKito itself: http://www.moskito.org

regards
Leon


On Thu, May 15, 2014 at 7:04 PM, Hariprasad Manchi
wrote:

> Hi,
> We are trying to use apache-tomcat 8.0.5 for our web application and have
> encountered performance issue with respect to the page response time.
> However, once the application is deployed in 8.0.5 we see a longer delay in
> response time from the server for the login page itself. With older version
> of tomcat i.e., tomcat 7.x(7.0.53), 6.x(6.0.18) we did not see such delay.
>
> We have 270 custom tags defined across 6 tld files in our application and
> have the tag pooling feature turned off in conf/web.xml (enablepooling is
> set to false; since this is a requirement for the application we had to
> turn it off).
>
> We tried to root cause the issue and used fidller tool to monitor the
> requests and response times. The browsers - both IE 11 and Chrome - were
> firing the requests quickly but were waiting for the response from the
> server. We do not know what is the actual cause for this delay. We have
> captured the traffic for both IE and Chrome and could send them if needed.
>
> Could you please advise how to proceed to identify the root cause for this
> delay? Or could you confirm this as already a known issue?
>
> Any help would be highly appreciated.
>
> We are not clear to which group the question should be posted, hence
> sending this email to both users and taglib-users email list.
>
> Regards,
> Hariprasad
>

Re: Best practice to load object in memory.

2014-05-16 Thread Christopher Schultz 
-BEGIN PGP SIGNED MESSAGE-
Hash: SHA256

Dhaval,

On 5/9/14, 2:46 PM, Dhaval Jaiswal wrote:
> At the time of initializing tomcat apps server, some object/data
> loading in memory, which is consuming lot of memory of the server.
> 
> What is the best practice to handle it. Loading of object/data is
> mandatory in my case.

So you have a requirement of loading a log of data into memory at
startup, but it's taking a lot of memory. Do I have that right?

You either need different requirements (no load on startup, or maybe
no need for free memory) or you need more memory.

Did you think there was some magic sauce you could add to fix your
conflicting requirements?

- -chirs
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RE: Test Mail, Please Ignore

2014-05-16 Thread Sebastien Tardif 
I sent email below yesterday and never saw it in the list:

-Original Message-
From: Sebastien Tardif 
Sent: Wednesday, May 14, 2014 12:59 PM
To: 'Tomcat Users List'
Subject: Slow execution of Tomcat 7.0.52 due to coarse lock in 
WebappClassLoader.loadClass
I'm having some visible performance issue related to the use of method 
synchronized loadClass(String name, boolean resolve) in WebappClassLoader

I see that the author or least some of the author(s) of the class got the idea 
in other cases of a more specialize lock that against the entire instance.

Should we just lock here using the name of the class we are looking for?

My partial threads stack dump:

2014-05-14 12:36:01
Full thread dump Java HotSpot(TM) 64-Bit Server VM (20.45-b01 mixed mode):

"http-bio-31680-exec-57" - Thread t@124
   java.lang.Thread.State: BLOCKED
at 
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1605)
- waiting to lock <264d40df> (a 
org.apache.catalina.loader.WebappClassLoader) owned by "http-bio-31680-exec-41" 
t@108
at 
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1571)
at 
com.sun.xml.internal.bind.v2.model.nav.ReflectionNavigator.findClass(ReflectionNavigator.java:505)
...
"http-bio-31680-exec-56" - Thread t@123
   java.lang.Thread.State: BLOCKED
at 
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1605)
- waiting to lock <264d40df> (a 
org.apache.catalina.loader.WebappClassLoader) owned by "http-bio-31680-exec-41" 
t@108
at 
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1571)
at 
com.sun.xml.internal.bind.v2.model.nav.ReflectionNavigator.findClass(ReflectionNavigator.java:505)

"http-bio-31680-exec-55" - Thread t@122
   java.lang.Thread.State: BLOCKED
at 
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1605)
- waiting to lock <264d40df> (a 
org.apache.catalina.loader.WebappClassLoader) owned by "http-bio-31680-exec-41" 
t@108
at 
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1571)
at 
com.sun.xml.internal.bind.v2.model.nav.ReflectionNavigator.findClass(ReflectionNavigator.java:505)

   Locked ownable synchronizers:
- locked <444b3957> (a 
java.util.concurrent.locks.ReentrantLock$NonfairSync)

"http-bio-31680-exec-54" - Thread t@121
   java.lang.Thread.State: BLOCKED
at 
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1605)
- waiting to lock <264d40df> (a 
org.apache.catalina.loader.WebappClassLoader) owned by "http-bio-31680-exec-41" 
t@108
at 
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1571)
at 
com.sun.org.apache.xerces.internal.utils.ObjectFactory.findProviderClass(ObjectFactory.java:358)

"http-bio-31680-exec-53" - Thread t@120
   java.lang.Thread.State: BLOCKED
at 
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1605)
- waiting to lock <264d40df> (a 
org.apache.catalina.loader.WebappClassLoader) owned by "http-bio-31680-exec-41" 
t@108
at 
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1571)
at 
com.sun.xml.internal.bind.v2.model.nav.ReflectionNavigator.findClass(ReflectionNavigator.java:505)

"http-bio-31680-exec-52" - Thread t@119
   java.lang.Thread.State: BLOCKED
at 
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1605)
- waiting to lock <264d40df> (a 
org.apache.catalina.loader.WebappClassLoader) owned by "http-bio-31680-exec-41" 
t@108
at 
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1571)
at 
com.sun.xml.internal.bind.v2.model.nav.ReflectionNavigator.findClass(ReflectionNavigator.java:505)

"http-bio-31680-exec-51" - Thread t@118
   java.lang.Thread.State: BLOCKED
at 
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1605)
- waiting to lock <264d40df> (a 
org.apache.catalina.loader.WebappClassLoader) owned by "http-bio-31680-exec-41" 
t@108
at 
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1571)
at 
javax.xml.parsers.FactoryFinder.getProviderClass(FactoryFinder.java:119)

"http-bio-31680-exec-50" - Thread t@117
   java.lang.Thread.State: BLOCKED
at 
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1605)
- waiting to lock <264d40df> (a 
org.apache.catalina.loader.WebappClassLoader) owned by "http-bio-31680-exec-41" 
t@108
at 
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1571)
at 
com.sun.xml.internal.bind.v2.model.nav.ReflectionNavigator.findClass(ReflectionNavigator.java:505)


"http-bio-31

Re: where find documentation

2014-05-16 Thread Арсений Зинченко 
I used this one:

http://wiki.metawerx.net/wiki/Web.xml


2014-05-15 16:05 GMT+03:00 Francesco Viscomi :

> Hi all,
> i'm try to find a documentation that describe every tag inside the web.xml
> file, but i wasn't able to find anything about that on
> http://tomcat.apache.org/tomcat-5.5-doc/config/context.html
>
>
> someone can help me?
> thanks in advance;
> Francesco
> Italy
>

Re: Increment XX:PermSize for Tomcat 7 on Windows 2012R2

2014-05-16 Thread Daniel Mikusa 
On May 12, 2014, at 10:54 AM, Lorenzo Fini  wrote:

> Hi,
> I'm trying to increment the PermSize on Tomcat 7.
> I added  -XX:PermSize in the java options launching tomcat7w,
> causing Tomcat to not load and to give me the following error on Windows
> Server 2012R2:
> 
> Unrecognized VM option 'PermSize=256m ‘

Are you perhaps using a JVM that doesn’t have a PermSize like Oracle Java 8?

  http://java.dzone.com/articles/java-8-permgen-metaspace

> 
> The same configuration was working on Windows Server 2007.
> I was able to start the server adding -XX:PermSize=256m inside double
> quotes, now the question is.. is it the right way?

Is it honoring the value?  In other words, does it actually increase the size 
of the permgen?

Dan

> 
> 
> Lorenzo


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Slow page response time in tomcat 8.0.5

2014-05-16 Thread Hariprasad Manchi 
Hi,
We are trying to use apache-tomcat 8.0.5 for our web application and have
encountered performance issue with respect to the page response time.
However, once the application is deployed in 8.0.5 we see a longer delay in
response time from the server for the login page itself. With older version
of tomcat i.e., tomcat 7.x(7.0.53), 6.x(6.0.18) we did not see such delay.

We have 270 custom tags defined across 6 tld files in our application and
have the tag pooling feature turned off in conf/web.xml (enablepooling is
set to false; since this is a requirement for the application we had to
turn it off).

We tried to root cause the issue and used fidller tool to monitor the
requests and response times. The browsers - both IE 11 and Chrome - were
firing the requests quickly but were waiting for the response from the
server. We do not know what is the actual cause for this delay. We have
captured the traffic for both IE and Chrome and could send them if needed.

Could you please advise how to proceed to identify the root cause for this
delay? Or could you confirm this as already a known issue?

Any help would be highly appreciated.

We are not clear to which group the question should be posted, hence
sending this email to both users and taglib-users email list.

Regards,
Hariprasad

Re: Comet Servlet with a reverse proxy in front of it

2014-05-16 Thread Elias Kopsiaftis 
Hey,

I actually got this working so far with nginx(and by so far I mean the
random connection errors I was getting with apache2 have not surfaced yet).

Ill post the nginx config setup later today when I get home for the benefit
of anyone else who wants to do this.


On Mon, May 12, 2014 at 3:34 PM, Christopher Schultz <
ch...@christopherschultz.net> wrote:

> -BEGIN PGP SIGNED MESSAGE-
> Hash: SHA256
>
> Elias,
>
> On 5/12/14, 11:20 AM, Elias Kopsiaftis wrote:
> > Is there any way to put a reverse proxy in front of a Comet
> > servlet?
>
> I don't believe so. There is work being done on supporting Websocket
> through mod_proxy but it will likely never support Comet.
>
> > I tried apache but thats a no go because it uses a single thread
> > per connection, which is not scaleable
>
> Only some Apache httpd MPMs are one-thread-per-connection.
>
> > then I tried nginx, which perhaps I did something wrong in my
> > setup but in the client code, the call to getInputStream never
> > returns, indicating something is wrong. I apologize for not
> > providing too many details and just proposing a general question,
> > but Im hoping there is a general solution to this problem. If you
> > guys needs server specific details I can provide later today when I
> > get home from work.
>
> I think that httpd + Tomcat is not going to work, here. I'm not sure
> about Nginx. If you find something that works, please post back with
> your findings.
>
> - -chris
> -BEGIN PGP SIGNATURE-
> Version: GnuPG v1
> Comment: GPGTools - http://gpgtools.org
> Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/
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> =+J8x
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>

Re: tomcat6 thread locked

2014-05-16 Thread devoss ind 
On 7 May 2014 17:37, "devoss ind"  wrote:
>
> Hi,
>
> Am using tomcat 6, java6 in production environment to run our web
application. We found that recently, cpu in top is showing 100% nearly.
Then we dig into each thread cpu usage by -H option in top. We found only
one thread is taking 100%usage and identified the thread using thread dump.
The thread dump for that particular thread which is using 100% usage is as
follows...
>
> "http-8080-exec-3687" daemon prio=10 tid=0x7336f400 nid=0x41a1 runnable
[0x619ad000..0x619ade30]
>java.lang.Thread.State: RUNNABLE
> at
org.apache.coyote.http11.InternalNioOutputBuffer.addToBB(InternalNioOutputBuffer.java:616)
> - locked <0x967b22f0> (a
org.apache.coyote.http11.InternalNioOutputBuffer)
> at
org.apache.coyote.http11.InternalNioOutputBuffer.commit(InternalNioOutputBuffer.java:608)
> at
org.apache.coyote.http11.Http11NioProcessor.action(Http11NioProcessor.java:1024)
> at org.apache.coyote.Response.action(Response.java:183)
> at org.apache.coyote.Response.sendHeaders(Response.java:379)
> at
org.apache.catalina.connector.OutputBuffer.doFlush(OutputBuffer.java:305)
> at
org.apache.catalina.connector.OutputBuffer.flush(OutputBuffer.java:288)
> at
org.apache.catalina.connector.Response.flushBuffer(Response.java:548)
> at
org.apache.catalina.core.StandardHostValve.status(StandardHostValve.java:345)
> at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:144)
> at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
> at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
> at
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:286)
> at
org.apache.coyote.http11.Http11NioProcessor.process(Http11NioProcessor.java:879)
> at
org.apache.coyote.http11.Http11NioProtocol$Http11ConnectionHandler.process(Http11NioProtocol.java:719)
> at
org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:2080)
> at
java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
> at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
> at java.lang.Thread.run(Thread.java:619)
>
> We can see that above thread is locked due to some problem in NIO.
>
> We have verified in tomcat manager also for such thread. We found that a
particular thread is taking 14140517ms time and the request in that line is
of POST request which is not related to our application.
>
> That particular thread is not releasing till we restart tomcat.
>
> This is happening frequently.
>
> Please help me to find out the root cause of this problem. How to avoid
restarts.
>
> Our server.xml connector configuration is as follows...
>
> connectionTimeout="5000"
>  acceptCount="1500"
>maxThreads="1"
>redirectPort="8443" />
>
> Please help in this thread locking problem.
>

Tomcat dependency on application server

2014-05-16 Thread Randhir Singh 
Hi,

We have JBoss as the application server & Tomcat as the web server in our
production & developmental setup which is on Red Hat Linux 5.X. We have
tomcat 6.X. My query is that if I need to restart tomcat, do I need to
restart JBoss & Tomcat both or just restarting Tomcat would be enough. I am
asking this query because I had killed the tomcat process using kill -9 and
while restarting tomcat it was not starting but when I killed JBoss &
tomcat and then restarted, Tomcat was up.

I hope my query is clear whether Tomcat is dependent on JBoss.

Regards

-- 

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Re: Compiling mod_jk in CentOs release 6.5

2014-05-16 Thread Doug Tucker 

/configure

--with-apxs=/usr/lib64/httpd/modules


whenever I run above I keep getting this:

configure: error: You must specify a valid --with-apxs path

Any ideas why I am getting this error?



I just did this with my centos 6.5 system and the command I used was:

 ./configure --with-apxs=/usr/sbin/apxs



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Is the listserv down?

2014-05-16 Thread Jeffrey Janner 
Last message I got was Mark notifying Martin he was toast.
That was 2 days ago.

Jeffrey Janner
Sr. Network Administrator
jeffrey.jan...@polydyne.com
PolyDyne Software Inc.
Main:   512.343.9100
Direct:  512.583.8930

 [cid:image002.png@01CC0FB7.4FF43CE0]

Speed, Intelligence & Savings in Sourcing

Re: Application monitoring

2014-05-16 Thread Leon Rosenberg 
Hello David,

I will not ask you why you are reinventing the wheel (ok, I lied, why are
you reinventing the wheel?).
You have multiple options available:
1) You could use jmx and publish your information as jmx beans.
2) You could use rmi between you 'collector' and the target apps.
3) You could use simple http (preferably json), but in that case I would
advice to setup a separate collector for it.

For any of the above options there are numbers of classes and utilities you
can use. For example jersey as jax-rs implementation is perfect for
exchange of json data, for rmi you could use DistributeMe (
http://www.distributeme.org) or spring-remote, and so on.

But yet again, why reinventing the wheel?

regards
Leon



On Wed, May 14, 2014 at 6:28 PM, David kerber  wrote:

> I am working on a small Tomcat servlet to monitor other tomcat-based
> applications running on the same physical machine, and am trying to figure
> out the best way to communicate between the monitoring app, and the
> monitored apps.
>
> My setup has several tomcat instances of a single application, each
> running from its own directory, and listening on its own TCP port.  So
> there is no direct communication between the instances.
>
> I'm trying to monitor various data about the application, not about tomcat
> itself or the JVM. So I want to collect such things as the number of
> requests it has processed, the last data received, etc, and not things like
> memory and cpu usage.  It is my app, so I can (and expect to need to) add
> methods or servlets to return the information I want to collect.
>
> My question is, what is the best way to make the request to get the data?
>  Would  URL request from the monitoring app to the monitored app be
> appropriate, and then parse the response out for display in a browser?  If
> so, what java class is likely to be useful for this communication?  I will
> have all the information needed to connect to the application instance
> (server, port, etc), but want it to be portable across OS types.
>
> Thanks!
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where find documentation

2014-05-16 Thread Francesco Viscomi 
Hi all,
i'm try to find a documentation that describe every tag inside the web.xml
file, but i wasn't able to find anything about that on
http://tomcat.apache.org/tomcat-5.5-doc/config/context.html


someone can help me?
thanks in advance;
Francesco
Italy