Are you using the default ORB that is delivered with the jre or utilizing your own?  (ie Visibroker).  In our situation in using Visibroker, we had to make sure that an orb.properties file existed within the %jre%/bin directory containing the specifics for the orb.
 
my orb.properties file
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# Make VisiBroker for Java the default ORB
org.omg.CORBA.ORBClass=com.inprise.vbroker.orb.ORB
org.omg.CORBA.ORBSingletonClass=com.inprise.vbroker.orb.ORB

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