Re: [eclipselink-users] remove boiler plate code in POJO that does JPA

[jamesssss <jamesssss@xxxxxxxxx>]

This is what SessionBeans normally provide.  If you can't use EJB, perhaps
you can use Spring which has similar functionality.

Otherwise, you could use some sort of command pattern.

i.e.
    public void doSomething(MyClass data) {
       MyJPAService.processTransaction(new JPAService() {
            public void process(EntityManager em) {
              // save into database, this is the real code that differs from
method to method 
            }
      });
    }


MyJPAService {
  processTransaction(JPAService service) {
        UserTransaction transaction = null;
        try {
            EntityManager em = (EntityManager) new
InitialContext().lookup("java:comp/env/persistence/myapp");
            transaction = (UserTransaction) new
InitialContext().lookup("java:comp/UserTransaction");
            transaction.begin();

            service.process(em);

            transaction.commit();
        } catch (Exception ex) {
            try {
                  if (transaction != null) transaction.rollback();
            } catch (Exception e) {
                  //logging into log file;
            }
           
            throw new RuntimeException(ex);
        } 
}



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