Are @ManyToMany relationships in GAE related?

Question

I understand that with GAE JPA support, I cannot:

@ManyToMany
    private Set<SSUser> contacts; 

    protected SSUser(){}

    public SSUser(final String userId, final String emailId){
        this.userId = userId;
        this.emailId = emailId;
        contacts = new HashSet<SSUser>();
    }

I am trying to establish a contact relationship. Did I understand correctly that the above is not allowed?

If yes, is it permissible Set<String> contactsIds? Can I provide a working example?

Answer 1

Yes, they are not allowed.

Make contacts? Allowed? Can I provide a working example?

This works, see http://screenshoter.svn.sourceforge.net/viewvc/screenshoter/screenshoter/trunk/SS-server/src/com/mysimpatico/ss/server/SS_serverServlet.java?revision=8&view=markup

Answer 2

- , :

JPA 2.0

JPA :

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• "". . , .
• (group by, having, sum, avg, max, min)
• . . .