@Override
public boolean equals(Object obj) {
if (this == obj) return true;
if (obj == null) return false;
if (getClass() != obj.getClass()) return false;
POJO2Parent other = (POJO2Parent) obj;
if (children == null) {
if (other.children != null) return false;
} else if (!children.equals(other.children)) return false;
if (sibling == null) {
if (other.sibling != null) return false;
} else if (!sibling.equals(other.sibling)) return false;
return true;
}
