@Override
      public void afterCreate(EntryEvent e) {
        assertEquals(getCurrentExpectedKey(), e.getKey());
        assertEquals(callbackArg, e.getCallbackArgument());
        assertEquals(true, e.isCallbackArgumentAvailable());
      }
make sure callback arg is NOT_AVAILABLE in all the places it should be
geode-core/src/distributedTest/java/org/apache/geode/cache30/CallbackArgDUnitTest.java