@Override
    public boolean equals(Object obj) {
      if (this == obj) {
        return true;
      }
      if (obj == null) {
        return false;
      }
      if (getClass() != obj.getClass()) {
        return false;
      }
      CHMHolder other = (CHMHolder) obj;
      if (chm == null) {
        return other.chm == null;
      } else
        return chm.equals(other.chm);
    }
A serializable with a writeReplace method should use standard serialization.
geode-core/src/integrationTest/java/org/apache/geode/pdx/AutoSerializableJUnitTest.java