How to get Java Thread Dump

Get thread dump of java on UNIX

• • Please make sure Java runnning without "-Xrs" JVM option and "&"

  • for background process.

  • On terminal window, check Java's process ID by using "ps" command.

  • Then, execute "kill -3 pid" for sending "SIGQUIT" signal.

  • Java Thread Dump will be generated to standard out or nohup.out or javacorexxx.txt

Get thread dump of java on Windows command prompt

• • Please make sure Java runnning without "-Xrs" JVM option.

  • Ctrl+Pause(Break) on the command prompt window

You should increase Screen Buffer Height size on Layout tab of command

prompt property.

Get thread dump of java on Windows Service

• • Shutdown Java.

  • Open server.bat by notepad or some editor

  • For using jdb, add some jdb parameters to "JAVA2_MEMSET" environment valiable;

  • ex) -Xdebug -Xrunjdwp:transport=dt_socket,server=y,suspend=n,address=5556

  • rf) http://java.sun.com/j2se/1.4.2/docs/tooldocs/windows/jdb.html

  • For reflecting this modification to registry, execute "server.bat -service" once on Command Prompt.

  • Start Java from control panel.

  • On command prompt, execute jdb like;

  • ex) %JAVA_HOME%\bin\jdb -connect com.sun.jdi.SocketAttach:hostname=localhost,port=5556

  • Execute "suspend" command for suspending all process

  • Execute "where all" command for getting all java process info

  • Execute "resume" command for resuming all process

  • Exit jdb