updating with em.merge(entity) is not working, Please Help

[Farhad Rahmati]

Hello every one

I am totally new in JEE6 world. I am having trouble with updating the records. here is my code.

public Supplier updateSupplier(Supplier supplier) {
        Supplier updated = em.merge(supplier);
        try {
            sendJMSMessageToNotificationQueue(updated);
        } catch (JMSException ex) {
            Logger.getLogger(SupplierSessionBean.class.getName()).log(Level.SEVERE, null, ex);
        }
        System.out.println("Supplier updated in SuplierSessionBean!");
        return updated;

    }

and here is the error I get.

javax.el.MethodNotFoundException: /supplierdetails.xhtml @30,113 action="#{supplierMB.details.update}": Method not found: MCD.ENTITIES.Supplier[ supplierREF=4 ].update()

I would appreciate if anyone can help me.
Thanks