On 23/11/2010 02:19, Blair Zajac wrote:

> Any suggestions in tracking this down?  Would a custom Tomcat build that
> gets each key and value in a try/catch block be useful?

Almost certainly. As far as I can tell there is a collections object in
a thread local that is non-null yet returns null for a call to
iterator(). That seems wrong to me.

The root cause could be a bug in the collection class or it might be a
side-effect of multiple threads accessing a non-thread-safe collection.

Putting the value.toString() calls inside try-catches should make it
more robust. I'll do that for 7.0.x and propose it for 6.0.x.

Do let us know what the problem was when you find it.

Mark

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