Heritrix: Internet Archive Web Crawler

Upon starting a new job, I get around 5 NPEs in the
finalization thread, each like:

System Thread [Finalizer] (Suspended (exception
NullPointerException))
CachedBdbBigMap(CachedBdbMap).close() line: 270
CachedBdbBigMap(CachedBdbMap).finalize() line: 283
Finalizer.invokeFinalizeMethod(Object) line: not
available [native method]
Finalizer.runFinalizer() line: 83
Finalizer.access$100(Finalizer) line: 14
Finalizer$FinalizerThread.run() line: 160

I'm only seeing these because I have the debugger set
to pause on all NPEs -- they're otherwise caught and
disregarded. But ideally they wouldn't happen at all...