Many-to-many with Attributes (Attribute-class with two @ManyToOne mappings as @Id) not possible ----------------------------------------------------------------------------------------------- Key: ANN-573 URL: http://opensource.atlassian.com/projects/hibernate/browse/ANN-573 Project: Hibernate Annotations Type: Bug Components: binder Versions: 3.2.1 Environment: Hibernate+Annotations 3.2.1-ga, HSQLDB 1.8.0.7 Reporter: Christian Köberl Attachments: manytomanybug.zip Im trying to map the following relation: Order 1-n OrderLine m-1 Product where the OrderLine contains an amount of the ordered product. The problem seems to be multiple @Id in combination with @ManyToOne: @Entity @Table(name = "order_line") // @IdClass(OrderLinePK.class) public class OrderLine implements Serializable { @Id @ManyToOne(targetEntity = Order.class) @JoinColumn(name = "order_id", nullable = false) private Order order; @Id @ManyToOne(targetEntity = Product.class) @JoinColumn(name = "product_id", nullable = false) ... } Hibernate maps the OrderLine class in the following way: DEBUG SchemaUpdate:149 - create table order_line (product varbinary(255) not null, order varbinary(255) not null, amount integer, primary key (order)) (maybe this relates to http://opensource.atlassian.com/projects/hibernate/browse/ANN-435) When I add an IdClass to the OrderLine, I get the following exception: Initial SessionFactory creation failed.org.hibernate.AnnotationException: mappedBy reference an unknown target entity property: model.OrderLine.order in model.Order.lineItems The example is attached as a runnable Maven2-Project, just run mvn test. The test dao.OrderDaoAnnotationTest fails. In the project I also tried to map the same classes with hbm-Files and this works (dao.OrderDaoHbmTest). -- 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