public boolean equals(Object obj) {
// a NPE can occurs, but I don't expect equals to be used before pk is set
if (obj != null && obj instanceof Parent) {
return id.equals(((Parent) obj).id);
} else {
return false;
}
}
public int hashCode() {
// a NPE can occurs, but I don't expect hashcode to be used before pk is set
return id.hashCode();
}