Re: Hi Guys ... can some one tell what is hashcode in java
On Wed, Sep 15, 2010 at 12:42 PM, Pankaj D pankaj66...@gmail.com wrote: What is DYH Do Your Homework. Best, Laird
Re: Still unable to get a heap dump from Tomcat running on Windows as a service
And the whole thing was a red herring. Well, most of it anyway. The buggy download page wasn't, and, indeed, the GUI monitor cannot change Tomcat's run as user despite pretending that it can, but those are comparatively minor issues. I'm sure that had Tomcat actually run out of memory, it would have dumped heap. The webapp in question, however, Hudson, did not have any memory options set for the massive Maven build it was running, and, since it forks a Maven process, it was the Maven process which was running out of heap. Days like this, I tell you. Thanks for all your help. Best, Laird On Wed, Feb 3, 2010 at 4:53 PM, Caldarale, Charles R chuck.caldar...@unisys.com wrote: From: Laird Nelson [mailto:ljnel...@gmail.com] Subject: Re: Still unable to get a heap dump from Tomcat running on Windows as a service turns out no matter what you do through the GUI console, the service still runs as the system account Yes, I mentioned that a few days ago: BTW, on Vista, you can't seem to change the account the Tomcat service runs under with the GUI tool - it has to be done with the Administrative Tools - Services snapin; don't know if that's true for Server 2K3. http://marc.info/?l=tomcat-userm=126514829321342w=2 - Chuck THIS COMMUNICATION MAY CONTAIN CONFIDENTIAL AND/OR OTHERWISE PROPRIETARY MATERIAL and is thus for use only by the intended recipient. If you received this in error, please contact the sender and delete the e-mail and its attachments from all computers. - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: Still unable to get a heap dump from Tomcat running on Windows as a service
Another data point: people have told me to download the Windows .zip distribution of Tomcat 6.0.24. I want to point out that this is not linked anywhere on the Tomcat download page. The *base* distribution is of course linked, and the .exe self-extracting-installer package, but I had to manually add -windows-x86 to cause the Windows distribution (containing among other things tomcat.exe, service.bat, etc.) to get downloaded. This was true no matter what mirror I selected. Best, Laird
Re: Still unable to get a heap dump from Tomcat running on Windows as a service
On Wed, Feb 3, 2010 at 9:28 PM, Laird Nelson ljnel...@gmail.com wrote: Another data point: people have told me to download the Windows .zip distribution of Tomcat 6.0.24. I want to point out that this is not linked anywhere on the Tomcat download page. The *base* distribution is of course linked, and the .exe self-extracting-installer package, but I had to manually add -windows-x86 to cause the Windows distribution (containing among other things tomcat.exe, service.bat, etc.) to get downloaded. This was true no matter what mirror I selected. Should have been more clear: http://tomcat.apache.org/download-60.cgi has, at the bottom, a Binary Distributions section, which lists the Core and Deployer options. If you hover over the Core .zip option, and then doctor its URL such that -windows-x86 appears right before the .zip, then you get the file that people have been recommending I download. Thanks, Laird
Still unable to get a heap dump from Tomcat running on Windows as a service
I am still unable to get Tomcat to dump heap when it encounters an OutOfMemoryError. My StackOverflow topic sums up what I've tried so far: http://stackoverflow.com/questions/2172220/can-i-get-tomcat-running-as-a-service-to-dump-heap I'm using the graphical program that comes up when you select Monitor Tomcat from the Windows Start Menu. I assume this is TomcatW.exe? I have Tomcat 6.0.20 running as a service under the default local user account, set to be allowed to interact with the desktop (I don't know if this is necessary; I've tried it both ways with no effect on the outcome). I've attempted to switch the startup mode to java from jvm to see if that would make a difference, but in that case the service simply won't start. I've specified -XX:HeapDumpPath=C:\crap, and -XX:HeapDumpPath=C:/crap to no avail. C:\crap is world readable and writable. I've set the working path for the Startup and Shutdown tabs to C:\crap and C:/crap with no effect. I've set memory to a minimum of 512 and a maximum of 1024 MB. Finally, following the example of what was already there in the text box, I entered the JVM options one per line. The tomcat documentation says to enter them separated by either a # or a ;, but I suspect that the GUI tool may be taking them and turning line breaks into # characters for me. Does anyone have any other suggestions to try before giving up on Tomcat in favor of either Jetty or (God help me) JBoss? Thanks much, Laird
Re: Still unable to get a heap dump from Tomcat running on Windows as a service
On Tue, Feb 2, 2010 at 4:19 PM, Caldarale, Charles R chuck.caldar...@unisys.com wrote: From: Laird Nelson [mailto:ljnel...@gmail.com] Subject: Still unable to get a heap dump from Tomcat running on Windows as a service I am still unable to get Tomcat to dump heap when it encounters an OutOfMemoryError. You appear to be unique in that regard, since no one else seems to be having that problem. Well aware of that; thanks! The reason I'm bringing it up on this list is just because I'm using the graphical tool without doing any egregious hacking, and it is not working the way I would expect it to. In such cases I blame the software until it is proven that I am putting in bad inputs, at which point I cheerfully blame myself and move on. No one has accused me so far of putting in bad inputs, and I can't see any myself. I have Tomcat 6.0.20 running as a service under the default local user account What's a default local user account? The one selected by default when one chooses the Log On tab of the graphical Tomcat monitor. The value of the label is: Local System account. That radio button is checked. Try using a real account, possibly one in the administrators group to see if that makes a difference. I will try this; thanks. set to be allowed to interact with the desktop Not needed. I'll make sure this is off. I've specified -XX:HeapDumpPath=C:\crap, and -XX:HeapDumpPath=C:/crap to no avail. Try just leaving that parameter out. Yep; tried that too. The Shutdown working path doesn't matter, since that's not normally used. Try setting the Startup path to the Tomcat installation directory after reinstalling Tomcat. The direction of the slash doesn't seem to matter; I get the .hprof file generated in the designated directory regardless of which I use. OK. I've set memory to a minimum of 512 and a maximum of 1024 MB. You normally want those to be the same for a server environment to avoid heap thrashing. OK; will change. I entered the JVM options one per line. That is a requirement. Good to know; thanks. Does anyone have any other suggestions to try before giving up on Tomcat in favor of either Jetty or (God help me) JBoss? I would try removing the existing Tomcat service, reinstalling the current (6.0.24) Tomcat from the .zip download, using the service.bat script to create the service, and only then try recreating the OOM problem. Unpack the .zip download into someplace other than C:\Program Files. Also try setting the Level on the Logging tab to Debug rather than Error to see if that shows anything interesting. OK; for various reasons I can't do the reinstall (without bureaucratic wrangling). I did the initial install from the Windows executable installer available from the main download site. It was beautifully simple and I let it set things up for me. Is there any reason to suppose that such an installation is somehow borked? Is there a problem with the out-of-the-box Windows experience that is heavily promoted on the Apache site? Thanks for the help! Best, Laird
Re: Still unable to get a heap dump from Tomcat running on Windows as a service
On Tue, Feb 2, 2010 at 4:40 PM, Sateesh Narahari sateesh.narah...@gmail.com wrote: The default user account 'System' has some weird permission state on Windows, so try the admin user. OK; leery of running my Tomcat as the administrator, but am not up to speed on which Windows users would be better choices. I naturally assumed that the local user selected by default was appropriate. Also, review the event log ( Windows Log, Security ) if it yields any information. Yep; did that; no issues. I believe you can also download resource kit from Microsoft that has tools that lets you watch all objects opened by a process ( so, look if Tomcat is even trying to open the file ). Its been a while, so don't recall tool sytax. Thanks! Best, Laird
Re: Still unable to get a heap dump from Tomcat running on Windows as a service
On Tue, Feb 2, 2010 at 4:41 PM, Caldarale, Charles R chuck.caldar...@unisys.com wrote: That's not a user account, that's the system account, with pretty much no privileges to do anything. ...which is pretty much how I like it. :-) I'm not a Windows guy, so bear with me for a moment: since I have moved the permissions on the working directory up such that Everyone has Full Control, surely then the system account could drop a file in that directory? Or is there some other privilege setting that says even if there's permission granted to the filesystem, the system account shalt not write even unto it? Thanks again for the help. Best, Laird
Re: Still unable to get a heap dump from Tomcat running on Windows as a service
Thanks for sticking with me, guys. No luck so far. I will begin the laborious process of requesting a reinstall. :-( (Incidentally, no service logs either, anywhere; this is all very bizarre.) L On Tue, Feb 2, 2010 at 7:01 PM, Caldarale, Charles R chuck.caldar...@unisys.com wrote: From: Filip Hanik - Dev Lists [mailto:devli...@hanik.com] Subject: Re: Still unable to get a heap dump from Tomcat running on Windows as a service set the HeapDumpPath option, so you can actually write to a location on disk You're late to the party; that's already been tried, to no effect. It's not needed if the Startup tab has the Working Path set - which Laird has also tried. Seems to work for everyone but him. - Chuck THIS COMMUNICATION MAY CONTAIN CONFIDENTIAL AND/OR OTHERWISE PROPRIETARY MATERIAL and is thus for use only by the intended recipient. If you received this in error, please contact the sender and delete the e-mail and its attachments from all computers. - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: Getting a heap dump on OOME from Tomcat-as-a-service on Windows?
On Mon, Feb 1, 2010 at 1:32 PM, Christopher Schultz ch...@christopherschultz.net wrote: Have you tried the -XX:HeapDumpPath option as well? Yes, with no results. I suspect that your service doesn't have privileges to write to the cwd of the java process, so it doesn't write to the file. I don't know much about windows privs, but I suspect that writing to %TEMP% will work, though I have no idea where %TEMP% points for service runners. Duh; why didn't I think of that? Thanks for pointing that out. I'll try it. Best, Laird
Re: Getting a heap dump on OOME from Tomcat-as-a-service on Windows?
On Mon, Feb 1, 2010 at 1:35 PM, Laird Nelson ljnel...@gmail.com wrote: On Mon, Feb 1, 2010 at 1:32 PM, Christopher Schultz ch...@christopherschultz.net wrote: Have you tried the -XX:HeapDumpPath option as well? Yes, with no results. I suspect that your service doesn't have privileges to write to the cwd of the java process, so it doesn't write to the file. I don't know much about windows privs, but I suspect that writing to %TEMP% will work, though I have no idea where %TEMP% points for service runners. Duh; why didn't I think of that? Thanks for pointing that out. I'll try it. Gave Everyone full control of the C:\crap directory. Configured Tomcat through the service monitor to also append -XX:HeapDumpPath=C:\crap to the list of Java options. Started and stopped the service. Ran the build. Heap dumped, but no file was produced. Searched the entire computer for .hprof files; no results. Anything else before giving up? Best, Laird
Re: Getting a heap dump on OOME from Tomcat-as-a-service on Windows?
On Mon, Feb 1, 2010 at 5:41 PM, Sateesh Narahari sateesh.narah...@gmail.com wrote: When you view service properties, does it run under system account or did you give it a specific account to run under. LocalService I believe. I didn't give it a specific account to run under. Best, Laird
Getting a heap dump on OOME from Tomcat-as-a-service on Windows?
I have Tomcat 6 running as a service on Windows 2003. I go to the Tomcat service monitor, choose configure, choose the Java tab, and add: -XX:+HeapDumpOnOutOfMemoryError ...as one of the Java options. When the OutOfMemoryError that I'm concerned about hits, I look around on the disk to find an .hprof file. I searched the entire computer; no such file is found. Any pointers? Thanks, Laird
