How to get Java thread dump¶

• Linux OS with netcat package installed
• Jboss AS 4.x (it may work for Jboss 5.x)

1. first, find out the Jboss's web listening port and address.
   1. the listening port can be found in:
      

      ${Jboss Directory}/server/${profile name}/deploy/jboss-web.deployer/server.xml
      

   2. the listening address can be found in:
      

      netstat -tuna | grep ${listening port}
      

2. ssh to the target server
3. cd to /tmp
4. execute the following command:
   This command will output the result to current directory with a file named, thread_dump.${timestamp}
   • Template:
     

     $ echo -e "GET /jmx-console/HtmlAdaptor?action=invokeOp&name=jboss.system%3Atype%3DServerInfo&methodIndex=1 \n\n"  | nc listen_ip listen_port | cat > thread_dump.$(date +%Y-%m-%d_%H_%M_%S)
     

     • replace listen_ip with the listening IP
     • replace listen_port with the listening port
   • Example:
     

     $ echo -e "GET /jmx-console/HtmlAdaptor?action=invokeOp&name=jboss.system%3Atype%3DServerInfo&methodIndex=1 \n\n"  | nc 127.0.0.1 8080 | cat > thread_dump.$(date +%Y-%m-%d_%H_%M_%S)
     

5. append the .html to the output file
   From:
   

   thread_dump.2010-11-11_12_08_26.html
   

   
   To:
   

   thread_dump.2010-11-11_12_08_26.html
   

6. download the output file to local machine
7. done.