import com.sun.corba.se.spi.oa.NullServant; //导入依赖的package包/类
public CorbaMessageMediator invoke(java.lang.Object servant,
                                   CorbaMessageMediator request,
                                   byte[] objectId,
                                   ObjectAdapter objectAdapter)
{
    ORB orb = (ORB)request.getBroker() ;
    ORBUtilSystemException wrapper = ORBUtilSystemException.get( orb,
        CORBALogDomains.OA_INVOCATION ) ;

    if ((servant == null) || (servant instanceof NullServant)) {
        return request.getProtocolHandler().createSystemExceptionResponse(
            request, wrapper.badSkeleton(), null);
    } else {
        return request.getProtocolHandler().createSystemExceptionResponse(
            request, wrapper.getinterfaceNotImplemented(), null);
    }
}
 

import com.sun.corba.se.spi.oa.NullServant; //导入依赖的package包/类
/** Always throws OBJECT_NOT_EXIST if operation is not a special method.
* If operation is _non_existent or _not_existent, this will just
* return without performing any action, so that _non_existent can return
* false.  Always throws OBJECT_NOT_EXIST for any other special method.
* Update for issue 4385.
*/
protected void handleNullServant(String operation, NullServant nserv )
{
    try {
        if (orb.subcontractDebugFlag) {
            dprint(".handleNullServant->: " + operation);
        }

        SpecialMethod specialMethod =
            SpecialMethod.getSpecialMethod(operation);

        if ((specialMethod == null) ||
            !specialMethod.isNonExistentMethod()) {
            if (orb.subcontractDebugFlag) {
                dprint(".handleNullServant: " + operation
                       + ": throwing OBJECT_NOT_EXIST");
            }

            throw nserv.getException() ;
        }
    } finally {
        if (orb.subcontractDebugFlag) {
            dprint(".handleNullServant<-: " + operation);
        }
    }
}