Until/unless bug 25375 is fixed, I'd like to use the Xlib AWT peer. But I can't yet, because it doesn't implement the peer method for java.awt.Font.canDisplayUpTo - it throws an UnsupportedOperationException. (Incidentally, the gtk peer doesn't implement it either - it just returns a dummy answer.) I don't think that core Xlib provides a convenient API for this info, so maybe the Xlib peer should use Xft for font stuff instead of core Xlib.
Closing as won't fix as libgcj (and the java front-end) has been removed from the trunk.
Bug in GNU Classpath code. Only the Qt peer seems to implement this method.