Thursday, September 13, 2012

Best way to take Thread Dumps in Oracle WebLogic12c Server?

Below are the different ways on taking java thread dumps in a WebLogic Server environment.
Thread dumps are very useful to analyze and troubleshoot performance related issues such as server hang, deadlocks, slow running, idle or stuck applications,  etc.
Different ways to take thread dumps in WebLogic Server
Always prefer Operating system(OS) commands rather instead of Admin Console or Java Classes, because if the console is hanging, users won’t be able to connect to it to issue thread dumps.
1. OS Commands for Thread Dumps
i) On Windows,
<ctrl>+<break> — the thread dumps are generated in the server stdout
ii) On Solaris / Linux
first identify the process ID (pid) using   ps -ef | grep java, then run   kill -3 <pid> td_filename 2>&1
2. Using weblogic.WLST ( work only from WLS 9.x onwards)

First set CLASSPATH using setDomain.cmd or ( /wlst.cmd will also do in path C:\Oracle\Middleware\wlserver_12.1\common\bin ). Then run below command
java weblogic.WLST
save below code in file:
The thread dumps get stored in the location from where you run it.
3. From Weblogic Administration Console
navigating to Server -> <server_name> -> Monitoring -> Dump threads stack.
4. From the JRockit Command line
jrcmd <pid> print_threads

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