Hey, I have a composite key to user table. so i have class for the composite-id - UserID (first,second) I have class XXX like this: 1- the same pk like user 2- many to one to user. in the many-to-one to the user i use in joincolumns like this: @JoinColumns( { @JoinColumn(name = "first",referencedColumnName="first", @JoinColumn(name = "second",referencedColumnName="second") }) i get an exception: repeated column for column- first The same clumns are the PK and FK. Can you please advice. @Entity | public class Animal { | @EmbeddedId PK pk = new PK(); | @ManyToOne | @JoinColumns( { @JoinColumn(name = "first",referencedColumnName="first"), @JoinColumn(name = "second",referencedColumnName="second") }) | Owner owner; | } | | @Entity | public class Owner { | @EmbeddedId PK pk = new PK(); | } | | public class PK implements Serializable{ | public String first; | public String second; | } View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4171625#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...