The steps we are taking to test a workaround
in our builds are described here
to downgrade effort level on pack200
https://bugs.eclipse.org/bugs/show_bug.cgi?id=154069
So if you ran pack200 in your builds
during Callisto or currently run pack200, I would suggest adding yourself
to https://bugs.eclipse.org/bugs/show_bug.cgi?id=154069.