@BeforeClass
  public static void beforeClass() {
    Instantiator.register(new Instantiator(CustId.class, (short) 1) {
      @Override
      public DataSerializable newInstance() {
        return new CustId();
      }
    });
  }
Tests the DataType support for off-heap MemoryInspector.
geode-core/src/test/java/org/apache/geode/internal/offheap/DataTypeJUnitTest.java