Persist does not throw an exception in a JUnit test
I implement a JUnit test by using Toplink JPA provider. I must be missing something because I try to keep twice the same entity and no exception is thrown. PersistenceException, nor any other type of exception. The code can not be easier:@Test
Public Sub testAddExistingTeam() throws Exception {}
Team = new Team ("team2");
try {}
EntityManagerFactory emf =
Persistence.createEntityManagerFactory ("Fisher");
EntityManager em = emf.createEntityManager ();
em.getTransaction () .begin ();
EM. Persist (Team);
EM. Persist (Team);
em.getTransaction () .commit ();
EM. Close();
}
catch (Exception e) {}
e.printStackTrace ();
}
}
Note the two em.persist (team).
This code does not enter into the catch block or produce any kind of exception. On the other hand, I checked after the first
EM. Persist (Team); the team is really successful.
The relevant parts of the team following class definition:
@Entity
@Table (name = 'TEAM')
Team/public class implements Serializable {}
@Id
@Column (name = "NAME")
private String name;
@ManyToOne
@JoinColumn (name = "CLUB_NAME", referencedColumnName = "NAME")
Club private;
category private;
private String email;
@ManyToMany (mappedBy = "teams")
list < competition > competition private;
public Team (String name) {}
myIdName = name;
This.Club = null;
This.competitions = new ArrayList < competition > ();
}
more than builders...getters/setters...and.
}
I'm really intrigued by this problem. Could someone help? I would be really grateful!
Josepma
This is expected behavior as persist is a no - op if called on one managed entity (other than to the waterfall on relationships with cascade. Persist), and the first call to persist makes the past in team managed entity.
Try calling em.flush (); and em.clear (); between calls persist to get an exception.
The first flush will ensure that the team is inserted into the database, while that clear it peel while the second call persist will attempt to insert the team. JPA providers should not throw the entityExistsException persist - it can be delayed until the transaction either emptied or committed, then you are likely to get a PersistenceException validation instead of EntityExistsException to persist.
Best regards
Chris
Tags: Fusion Middleware
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