@Override
      public Object call() throws Exception {
        Properties props = new Properties();
        // props.setProperty(DistributionConfig.LOCATORS_NAME, "");
        getSystem(props);
        CacheFactory cf = new CacheFactory();
        cf.setPdxPersistent(pdxPersistent);
        getCache(cf);
        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