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From Apache Wiki <>
Subject [Tomcat Wiki] Update of "HowTo" by ChristopherSchultz
Date Mon, 22 Jun 2009 19:22:42 GMT
Dear Wiki user,

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The following page has been changed by ChristopherSchultz:

  Note that this last method also implies that in order to make any change to any application,
you will have to stop and restart Tomcat.
+ == How do I obtain a thread dump of my running webapp ? ==
+ You can only get a thread dump of the entire JVM, not just your webapp. This shouldn't be
a big deal, but should be made clear: you are getting a dump of all JVM threads, not just
those "for your application", whatever that means.
+ Getting a thread dump depends a lot on your environment. Please choose the section below
that matches your environment best. The more universal and convenient options are presented
first, while the more difficult ones or those for specific setups are provided later. Generally,
you should start at the top of the list and work your way down until you find a technique
that works for you.
+ === If you are running Sun JDK 1.6 or higher ===
+ Sun's JDK (not the JRE) ships with a program called ''jstack'' (or ''jstack.exe'' on Microsoft
Windows) which will give you a thread dump on standard output. Pipe the output into a file
and you have your thread dump. You will need the process id ("pid") of the process to dump.
Use of the program ''jps'' (''jps.exe'' on Microsoft Windows) can help you determine the pid
of a specific Java process.
+ === If you are on *NIX running Sun JDK ===
+ Sun provides ''jstack'' on *nix systems from version 1.4 onward. See the above tip if you
have such an environnment.
+ === If you are running on *NIX ===
+ Send a SIGQUIT to the process. The thread dump will be sent to stdout which is likely to
be redirected to CATALINA_BASE/logs/catalina.out.
+ To send a SIGQUIT, use ''kill -3 <pid>'' from the command line.
+ === If you are running Tomcat as a service on Microsoft Windows ===
+ Edit your service to add the "//MS//" option to the command line. This enabled the "Monitor
Service" which puts an icon in the system tray while Tomcat is running. Right-clicking the
Tomcat monitor in the system tray allows you to produce a thread dump in stdout.
+ === If you have Tomcat running in a console ===
+ *NIX: Press CRTL-\
+ Microsoft Windows: press CRTL-BREAK
+ This will produce a thread dump on standard output, but may not be possible to capture to
a file.

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