@BeforeClass
  public static void classSetup() {
    InternalDataSerializer.getDSFIDSerializer()
        .register(TestMessage.TEST_MESSAGE_DSFID, TestMessage.class);
  }
Test the DSFID serialization framework added for rolling upgrades
geode-core/src/distributedTest/java/org/apache/geode/internal/BackwardCompatibilitySerializationDUnitTest.java