[jboss-user] [EJB 3.0] - Composite Key is made up by foreign keys

mrchit_2000 do-not-reply at jboss.com
Fri Feb 23 03:04:50 EST 2007

Hi all,

I have problem finding out how to specify the member of the composite key are foreign keys pointing to primary key of other tables. 
For example, If my composite key have 2 columns (A,B). I created wrapper like
public final class CompKey implements Serializable {
         private int A;
         private int B;

        public boolean equals(Object obj) {
        public int hashcode() {

Then in my class I will use 
 public class MyClass implements Serializable{
        private int A;
        private int B;

But now I want to specify A and B as foreign keys, how do I do that? I tried using @JoinColumn and add 2 more fields to class MyClass but that gives me error saying the column names A and B are repeated.

Can someone tell me how to specify A and B as foreign key but can still use them as composite key at the same time?

Thank you very much in advance,

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