@Override
  public Object clone() {
    try {
      return super.clone();
    } catch (CloneNotSupportedException e) {
      throw new InternalError(
          "CloneNotSupportedException thrown in class that implements cloneable");
    }
  }
Returns the CqListener set with the CQ
geode-core/src/main/java/org/apache/geode/cache/query/internal/cq/CqAttributesImpl.java