@Override
      public Object call() throws Exception {
        Cache cache = getCache();
        RegionFactory rf = cache.createRegionFactory(RegionShortcut.REPLICATE);
        if (useQueue) {
          rf.addAsyncEventQueueId("queue");
        }
        Region region1 = rf.create("region");
        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