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How to get Java thread dump in Jboss » History » Version 2

chin-yeh, 11/11/2010 12:30 PM

1 2 chin-yeh
h1. How to get Java thread dump in Jboss
2 1 chin-yeh
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This guide is only applicable to:
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* Linux OS with *netcat* package installed
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* Jboss AS 4.x (it may work for Jboss 5.x)
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*Steps*
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# first, find out the Jboss's web listening port and address.
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## the listening port can be found in:
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<pre>
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${Jboss Directory}/server/${profile name}/deploy/jboss-web.deployer/server.xml
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</pre>
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## the listening address can be found in:
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<pre>
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netstat -tuna | grep ${listening port}
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</pre>
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# ssh to the target server
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# *cd* to */tmp*
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# execute the following command:
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This command will output the result to current directory with a file named, thread_dump.${timestamp}
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** *Template:*
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<pre>
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$ 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.$(date +%Y-%m-%d_%H_%M_%S)
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</pre> 
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*** replace *listen_ip* with the listening IP
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*** replace *listen_port* with the listening port
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** *Example:*
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<pre>
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$ 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)
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</pre>
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# append the *.html* to the output file
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*From:*
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<pre>
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thread_dump.2010-11-11_12_08_26.html
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</pre>
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*To:*
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<pre>
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thread_dump.2010-11-11_12_08_26.html
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</pre>
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# download the output file to local machine
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# done.