lookup() calls resolve() and then tries to narrow the result to
a NamingContext. If narrow() throws BAD_PARAM, then the original
objref is returned.

There appears to be a problem when objref exists but the corresponding
object does not. In that case, you get a COMM_FAILURE or OBJECT_NOT_EXIST
error, which getes propogated as an exception and the original
objref not returned.

The fix is to catch SystemException instead of BAD_PARAM.

In CNCtx.callResolve, change:

  } catch (org.omg.CORBA.BAD_PARAM e) {
return obj;
}

to
} catch (org.omg.CORBA.SystemException e) {
return obj;
}