How do you generate and analyze a thread dump from a running JBoss instance?

Question

How do you generate and analyze a thread dump from a running JBoss instance?

Answer 1

Two options:

OPTION 1 Generate a thread dump using JMX Console

In order to generate a thread dump:

1. Open the JMXConsole (for example: http://localhost:8080 )
2. Navigate to jboss.system:type=ServerInfo mbean (hint: you can probably just CTRL-F and enter type=ServerInfo in the dialog box)
3. Click on the link for the Server Info mbean.
4. Navigate to the bottom where it says listThreadDump
5. Click it and get your thread dump

Notes:

If you are using Internet Explorer you should use File > Save As to save the output instead of copying the data to a text editor. For some reason when you copy the text from Internet Explorer the line breaks are not copied and all of the output ends up on a single line.

OPTION 2 Generate a Thread Dump using Twiddle

Alternatively you can use twiddle to execute the listThreadDump() method and pipe the returned HTML directly to file. Use this command line:

/bin/twiddle invoke "jboss.system:type=ServerInfo" listThreadDump > threads.html