PersistentMap.keySet seems to produce a set containing values rather than keys. ------------------------------------------------------------------------------- Key: HHH-5398 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-5398 Project: Hibernate Core Issue Type: Bug Components: core Affects Versions: 3.3.0.SP1 Environment: Also Hibernate EntityManager 3.4.0 if that is relevant. Reporter: rufus hamade I have a persistent Map defined as follows: @Entity public class Task { [snip] @OneToMany(mappedBy="task") @MapKey(name="actor") private Map<Long, TaskCC> ccs = new HashMap<Long, TaskCC>(); } where @Entity public class TaskCC { @Id @GeneratedValue private Long id; @ManyToOne(fetch=FetchType.LAZY) private Task task; @ManyToOne(fetch=FetchType.LAZY) @AccessType("field") private Actor actor; } and actor is an independent entity (i.e., no associations to Task or TaskCC) with a Long id field. We have some code that does something like: ids = new HashSet<Long>(bug.getCcs().keySet()); But the ids set seems to contain the Actors rather than the Actor IDs. Let me know if the above is not sufficient and/or you want me to create a simplified test case for this. -- This message is automatically generated by JIRA. - If you think it was sent incorrectly contact one of the administrators: http://opensource.atlassian.com/projects/hibernate/secure/Administrators.... - For more information on JIRA, see: http://www.atlassian.com/software/jira