Hey Mark,
This is really good.
Presumably this is an outline for success -- and it is definitely an
outline for improvement of my rather improvished skills in this area.
Many thanks!
Ken
On Apr 21, 2009, at 5:54 PM, Mark Thomas wrote:
Ken Bowen wrote:
Mark,
Any chance we could make a headstart on "Resolving OOM-PermGen
errors on
webapp reload" ??
Perhaps some general pointers, guidance etc. [to help you refine the
talk in advance :-) ]
The very short version.
1. Find an app that you can't reload without OOME
2. Get a profiler - I like Yourkit
Full disclosure: they give ASF committers a free copy
3. Reload you app once
4. Use the profiler to look for instances of WebappClassLoader
5. Look for the one with the started attribute == false
6. Trace the GC roots for this instance
7. Fix whatever is hanging on to references to the instance - there
should not be any
The session (assuming it goes ahead) will do a demo of the above and
expand on 7 in terms of typical culprits and possible workarounds. It
will also explain what is going on and why this happens.
HTH,
Mark
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