SourceForge Submitter: tstanczak .
The ORB.java in JacORB und in JDK differ:

JDK 1.3, JDK 1.4

public NVList create_operation_list
(org.omg.CORBA.Object oper)

JacORB

public abstract NVList create_operation_list(Object
obj);
public abstract NVList create_operation_list
(OperationDef operationdef)

I am currently trying to recompile JBoss, after including
jacorb.jar in the compile classpath the
orb.jboss.system.ORBSingleton.java stops to compile,
because it adhers to JDK's interface, that is doesn't
implement the second create_operation_list method.

JBoss uses JacORB at runtime, in my naive thinking it
can't be right to use an interface at runtime, that
couldn't be fullfilled at compile time.