The tarball is generated from the upstream zip using orig-tar.sh which
removes bundled jar files and other binaries, including some which we
cannot regenerate in Debian but don't need.

To build the source package with git-buildpackage, you'll need to 
apply the patches and then build with --git-ignore-new.  That is:

	quilt push -a
	git-buildpackage --git-ignore-all

Or just extract the source package and use debuild -us -uc.