NPE in AvoidCallingFinalize
Fix various typos
CommentRequired raises violation on serialVersionUID field
CommentDefaultAccessModifier triggers on field annotated with @VisibleForTesting
#1410 Improve description of DefaultPackage rule
Please see and review https://github.com/pmd/pmd/pull/71
Deprecate UseConcurrentHashMap rule
Andreas, thanks for fixing that! Shouldn't we also update documentation to say more...