public void newInstantiator2(Instantiator instantiator) {
      String s = "Unexpected callback invocation";
      throw new UnsupportedOperationException(s);
    }
Returns wether or not one of this listener methods was invoked. Before returning, the
<code>invoked</code> flag is cleared.
geode-core/src/test/java/org/apache/geode/internal/DataSerializableJUnitTest.java