Hi.
I'm using OpenJPA 1.2.2 with OpenEJB 3.1.2, and facing an odd problem...
I have a BaseEntity class, which all other entities extend, with the following definition:

@MappedSuperclass
public abstract class BaseEntity {

  @Id
  @GeneratedValue(strategy = GenerationType.IDENTITY)
  private Long id;

  @Override
  public boolean equals(Object obj) {
    if (!getClass().isInstance(obj)) {
       return false;
    }
    BaseEntity other = (BaseEntity) obj;
    return id != null && id.equals(other.id);
  }

  public Long getId() {
    return id;
  }

  @Override
  public int hashCode() {
    return id == null ? System.identityHashCode(this) : id.hashCode();
  }

  @Override
  public final String toString() {
    return ClassHelper.getUnqualifiedName(getClass()) + "#" + id;
  }
}


When trying to persist a graph of objects, during flush, an StoreException is thrown, having as nested exceptions 3 times the following (probably 1 per instance persisted):
<openjpa-1.2.2-r422266:898935 nonfatal user error> org.apache.openjpa.util.InvalidStateException: The generated value processing detected an existing value assigned to this field: package.BaseEntity.id. This existing value was either provided via an initializer or by calling the setter method. You either need to remove the @GeneratedValue annotation or modify the code to remove the initializer processing.

However, I'm not assigning a value by hand: I've debugged and what's there is actually the value generated by the DB identity...

The intriguing is that if I remove the id from equals(), toString() and hashCode(), no error is thrown. But if I do that, I can no longer trust HashMaps / HashSets.

Is there a solution for it?

Thanks in advance.

--
Luis Fernando Planella Gonzalez