I have 2 entity classes: | package testing; | | import javax.persistence.*; | import java.util.List; | | @Entity | @Table(name = "A") | public class A | { | @Id | @Column(name = "Id") | private String mId; | | @OneToMany(mappedBy = "mA") | private List<B> mBList; | | //Getter and setters to the members... | } | | @Entity | @Table(name = "B") | public class B | { | @Id | @Column(name = "Id") | private String mId; | | @ManyToOne | @JoinColumn(name = "AId") | private A mA; | | //Getter and setters to the members... | } | The id column is of type uniqueidentifier and the database is MS SQL Server 2000. The following code prints out '0': | A a = mEntityManager.find(A.class, "cfaae25a-761b-4430-ba0d-566ddb9bd535"); | List<B> bList = a.getBList(); | | System.out.println(bList.size()); | If I have an integer as the primary key this code work without change (except for the type) and return 4 B's in the collection. But change the type to uniqueidentifier it no longer working. I have tried the code on glassfish and there it works with uniqueidentifier as PK type. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4032355#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...