>>>>> "Anthony" == Anthony Green <green@xxxxxxxxxx> writes: Anthony> The JacORB code is referring to org.omg.CORBA fields that Anthony> only appear in the JacORB version of these classes, and Anthony> there's no way to override libgcj's built-in version at build Anthony> time. At build time setting -bootclasspath or the like ought to work. At runtime, as Mark said, these classes are BC-compiled and can be overridden via extdirs. Could you post the error message and whatnot? Maybe that would help. Tom