@Override
      public Object call() throws Exception {
        Cache cache = getCache();
        Region region1 = cache.getRegion("region");
        region1.put(key, new SimpleClass(value, (byte) value));
        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