Fully featured low overhead profiler for Java EE and Java SE platforms.
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Easy to use performance and memory profiler for .NET framework.

I get 'java.lang.OutOfMemoryError: PermGen space'

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This problem is caused by class loader leaks. Read this article to learn how to profile class loading issues.

If you get this error running your application with the profiler and do not get it running without profiler, it can be caused by bytecode instrumentation which require additional space for class meta information. In this case, please increase PermGen size with -XX:MaxPermSize=<size in megabytes>m (e.g. add -XX:MaxPermSize=128m if you do not have -XX:MaxPermSize specified, or set bigger size in existing -XX:MaxPermSize)