@Override
      public Object call() throws Exception {
        Region r = getRootRegion("testSimplePdx");
        try {
          r.put(1, new SimpleClass(57, (byte) 3));
          fail("should have received an exception");
        } catch (PdxInitializationException expected) {
          // do nothing
        }
        return null;
      }
Test that we through an exception if one of the servers has persistent regions but not a
persistent registry.
geode-core/src/distributedTest/java/org/apache/geode/pdx/PdxClientServerDUnitTest.java