[eclipselink-users] How to generate the PK?

[Tanujit Chowdhury <chowdhury.tanujit@xxxxxxxxx>]

Hi,
I have an object that is representing a Table. It has a numeric primary key and each time a record is created it is incremented by 1.
How to define this in the Object mapping?

I have used the following:
@Entity
@Table(name = "vmlo.certificate")
public class Certificate implements Serializable {
    private static final long serialVersionUID = 1L;
    private int certKeyfield;
    private String certBrowserName;

    public Certificate() {
    }

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "CertKeyfield")
    public int getCertKeyfield() {
        return this.certKeyfield;
    }

    public void setCertKeyfield(int certKeyfield) {
        this.certKeyfield = certKeyfield;
    }
.
.
Using this I am getting an exception from my JPA provider EclipseLink:
<Error> <EJB> <BEA-010026> <Exception occurred 
during commit of transaction Name=[EJB 
com.thunderhead.simple.SimpleBean.process(int)],Xid=BEA1-0660A26EF337BD76B51F(9378830),Status=Rolled
 back. 
[Reason=weblogic.transaction.internal.AppSetRollbackOnlyException],numRepliesOwedMe=0,numRepliesOwedOthers=0,seconds
 since begin=0,seconds 
left=60,SCInfo[wl_server+examplesServer]=(state=rolledback),properties=({weblogic.transaction.name=[EJB
 
com.thunderhead.simple.SimpleBean.process(int)]}),OwnerTransactionManager=ServerTM[ServerCoordinatorDescriptor=(CoordinatorURL=examplesServer+192.168.2.165:7001+wl_server+t3+,
 XAResources={examples-demoXA, WLStore_wl_server_WseeFileStore, 
examples-demoXA-2, WLStore_wl_server_exampleJDBCStore, 
examples-multiDataSource-demoXAPool, 
WLStore_wl_server__WLS_examplesServer},NonXAResources={})],CoordinatorURL=examplesServer+192.168.2.165:7001+wl_server+t3+):
 weblogic.transaction.RollbackException: Unknown reason
        at weblogic.transaction.internal.TransactionImpl.throwRollbackException(TransactionImpl.java:1818)
        at weblogic.transaction.internal.ServerTransactionImpl.internalCommit(ServerTransactionImpl.java:333)

It does not explain the reason for exception. However, is it due to the reason that the PK generation is not happening or the EclipseLink does not know how to generate this PK? Is the GenerationType.IDENTITY is wrong to generate PK for this type?

Please help.

-- 
Tanujit Chowdhury