Hi,
I think that this question should be more related to Stack Overflow, as it seems to be a technical question. Groups is more suited for discussions than anything. We DO monitor stack for our tags and answer questions as they come.
While you should go to Stack, you should also include a lot more information in your question. Right now, with just a stacktrace, it's impossible to answer. It seems that whatever library you're using to log shouldn't be used (I use java.util.Logger)
Cheers!