Details
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Bug
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Status: Closed
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Major
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Resolution: Cannot Reproduce
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1.2.2
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None
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None
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None
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Windows XP, JDK 1.6.0_16, Tomcat 6, OpenJPA 1.2.2, Oracle 10g
Description
@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.