@Override
      public Object call() throws Exception {
        // Make sure the cache exists
        getCache();
        DataSerializer.writeObject(new SimpleClass(value, (byte) value),
            new HeapDataOutputStream(KnownVersion.CURRENT));
        return null;
      }
Test that an async queue doesn't require a persistent PDX type registry.
geode-core/src/distributedTest/java/org/apache/geode/pdx/PDXAsyncEventQueueDUnitTest.java