libgcj-4.3.0.jar is full of hidden SVN files.

[David Daney]

Try this on a libgcj-4.3.0.jar build from SVN sources:
[daney@silver64 libjava]$ jar tvf libgcj-4.3.0.jar | grep .svn | wc
  18426  147408 1788131

I don't suppose that it hurts other than slowing things down.

David Daney