General Info

h1. How to get Java thread dump

This guide is only applicable to:

* Linux OS with *netcat* package installed

* Jboss AS 4.x (it may work for Jboss 5.x)

*Steps*

# first, find out the Jboss's web listening port and address.

## the listening port can be found in:

<pre>

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

</pre>

## the listening address can be found in:

<pre>

netstat -tuna | grep ${listening port}

</pre>

# ssh to the target server

# *cd* to */tmp*

# execute the following command:

This command will output the result to current directory with a file named, thread_dump.${timestamp}

** *Template:*

<pre>

$ 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)

</pre> 

*** replace *listen_ip* with the listening IP

*** replace *listen_port* with the listening port

** *Example:*

<pre>

$ 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)

</pre>

# append the *.html* to the output file

*From:*

<pre>

thread_dump.2010-11-11_12_08_26.html

</pre>

*To:*

<pre>

thread_dump.2010-11-11_12_08_26.html

</pre>

# download the output file to local machine

# done.