TopLink Insert Update Issue

Question

Hi,
From my ADF Page I am calling the TopLink Query to update a record if it exists else insert a new record. I have an issue where first time if the record doesn't exist a new record is inserted in the Database table, next time if another call is made the record is updated. Now if I go and delete a Record in the Table and again Run the Query from my ADF Page the record is never inserted as it should insert a Record because I manaully deleted the Record before running the query again. Any idea what might be wrong looks like something is cached and when the query runs again it never creates the record. If I don't delete a record and manually update the data and run the query again it still doesn't update the record. Looks like only first time it works i.e. inserts a record and then updates it but after that any requests never do anything in the table. As it should update or insert a record for each request coming from ADF Page. Here is the code I have:
          Session session = getSessionFactory().acquireSession() ;
        UnitOfWork uow = session.acquireUnitOfWork() ;
        ExpressionBuilder builder = new ExpressionBuilder() ;
        Expression expression = builder.get("stateName").equal("TX").and(builder.get("deptDesc").equal("HR")).and(builder.get("id").equal("1234")).and(builder.get("user").equal("XASW")).and(builder.get("mngCont").equal("3A45")) ;
        DepartmentDescription dd = (DepartmentDescription)uow.readObject(DepartmentDescription.class,
                                                                        expression) ;
        if (dd == null)
            dd = new DepartmentDescription() ;
            dd.setStateName("TX") ;
            dd.setId("1234") ;
            dd.setDeptDesc("HR") ;
            dd.setUser("XASW") ;
            dd.setMngCont("3A45") ;
            dd.setValue("Record Inserted") ;
        else
            dd.setValue("Record Updated") ;
        uow.registerObject(dd) ;
        uow.commit() ;
        session.release();
          Thanks

Answer 1

This is because the object is still in the TopLink cache.
<p>
You can either invalidate the object in the TopLink cache (session.getIdentityMapAccessor().invalidateObject()), or use registerNewObject to force the insert. If it is just a test, you could also clear the cache (session.getIdentityMapAccessor().initializeIdentityMaps()), ).
<p>
You could also disable the cache by setting your descriptor to be isolated.
<p>
-- James : EclipseLink