Java... what a hell?!?

Recently I experience a problem with Java (both 1.5 and 1.6, up to update 3), which throws the following message error in your face:

The error is: xcb_xlib.c:50: xcb_xlib_unlock: Assertion 'c->xlib.lock'

It does not affects all Java programs (my Eclipse was still running) but some. Not weirdly enough it seems actually a Java problem instead of a Fedora problem. Anyway, to workaround the problem the procedure is even more weird (extracted from here):

sed -i 's/XINERAMA/FAKEEXTN/g' /usr/java//jre/lib/i386/xawt/libmawt.so