INVALID_METHODID

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Using Ubuntu 14.04 64-bit. Built from @12 with patch from #3 applied. In both 
JDK 7u55 and 6u45, when I run an application (Jenkins) with the agent loaded, 
`traces.txt` is created but has no content. When I interrupt the process with 
Ctrl-C, the following is printed:

{{{
One of your monitoring interfaces is having trouble resolving its stack traces. 
 GetMethodName on a jmethodID involved in a stacktrace resulted in an 
INVALID_METHODID error which usually indicates its declaring class has been 
unloaded.
}}}

Original issue reported on code.google.com by jgl...@cloudbees.com on 28 May 2014 at 5:16