libgcj's IsAssignableFrom returns results opposite to those returned by Sun. This seems to be a simple mix-up of the meanings of the function's two arguments.
-- Summary: IsAssignableFrom reverses arguments Product: gcc Version: 4.1.0 Status: UNCONFIRMED Severity: normal Priority: P2 Component: libgcj AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: fitzsim at redhat dot com CC: gcc-bugs at gcc dot gnu dot org,java-prs at gcc dot gnu dot org http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23739