Merge Detached Entity - Attempted to attach instance * but this instance is
already in the datastore
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Key: OPENJPA-1671
URL: https://issues.apache.org/jira/browse/OPENJPA-1671
Project: OpenJPA
Issue Type: Bug
Affects Versions: 1.2.2
Environment: Windows XP, JDK 1.6.0_16, Tomcat 6, OpenJPA 1.2.2, Oracle
10g
Reporter: Seth Jackson
@Entity
@Table(name="USERS")
@Inheritance(strategy=InheritanceType.TABLE_PER_CLASS)
public class User implements Serializable {
@Id
@Column(name="user_name")
private String userName;
/* getter / setter */
}
@Entity
public class UserExtended extends User {
@Column (name="phone)
private String phone;
/* getter / setter */
}
// Save currently existing user (detached entity)
UserExtended user = new UserExtended();
user.setUserName("USER");
user.setPhone("111-222-3333");
entityManager.merge(user);
Receive exception:
Attempted to attach instance "USER" of type "class com.UserExtended", but this
instance is already in the datastore as type "class com.User".
I've narrowed it down to this:
When the merge() is called on the UserExtended class, OpenJPA retrieves the
data from the user table to perform the merge. When it retrieves this data, I
believe it's retrieving it in the form of a User entity, not a UserExtended
entity, causing the merge to fail.
If I retrieve the UserExtended entity from the database, change a value, then
merge() I receive no errors.
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