Old skool java programmers will have almost certainly come across the tool JWhich (http://www.javaworld.com/javaworld/javatips/jw-javatip105.html).  It's the classic tool for finding out which jar file contains a class.  The following line of code has the same effect, and is slightly better than just trying to grep jar files.

com.ibm.websphere.management.AdminService.class. getClassLoader(). getResource( "com/ibm/websphere/management/AdminService.class");1

1 – after reading the source for JWhich I realised that I have just copied it exactly ↩

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