: I get these NullPointException records every once and a while, always : from SolrCore and SolrDispatchFilter. Don't get a stack trace, and no : nearby errors seem to clarify what might have happened.
that's really strange ... i'm not sure what's causing those, or why you aren't seeing a stack trace. i'm not too familiar with the XmlFormatter, but according to the docs it does support an <exception> section with multiple <frame>s. any chance you could configure an additional SimpleFormatter just for SEVERE messages to help us track it down? -Hoss
