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

["Zhou, Yan" <yzhou@xxxxxxxxxxx>]

Hi there, 

I am using EclipseLink 1.x that comes with Weblogic 10.3.1 (cannot upgrade yet).   All my business methods have boilerplate code like this. It is a GWT app., the following is the backend. 

I am not able to use annotation to get EntityManager because my class is POJO and injection does not work on POJO. 

How can I remove such boilerplate code?
1. Without explicitly getting EntityManager and then Transaction everytime
2. Implement an exception handler that will rollback the transaction. But how do I get the transaction object in exception hander?    The interface org.eclipse.persistence.exceptions.ExceptionHandler  does not have that.

    public void doSomething(MyClass data) {
        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();

            // save into database, this is the real code that differs from method to method

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

Thanks,
Yan





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