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Hibernate version: 2.17

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Code between sessionFactory.openSession() and session.close():

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Strange problem. My DAO layer is using Hibernate. I retrieve a POJO "Task" from the DAO. It has a Set which contains POJOs of type "TaskJob" (Task is parent of TaskJob).
I define a new TaskJob, set its parent to the Task I have retrieved; and then add it in the Set of the Task I have retrieved. Now I do not call the save method of my DAO and just commit the transaction. I expect Hibernate not to save it as I should call the save method of my DAO explicitly. What happening is Hibernate is saving it.

Can someboddy please explain? Thanks


This is my script :

String taskName = "Task A";

try {
HibernateUtil.getSession();
HibernateUtil.beginTransaction();

// creates a SchedulerDAOFactory
SchDAOFactory aSchDAOFactory = SchDatastoreSelector.getSchDAOFactory();

// creates a TaskDAO
TaskDAO aTaskDAO = aSchDAOFactory.getTaskDAO();

// retrieve the Task whose Name = ? and display it
Task aTask = aTaskDAO.getTaskByTaskName( taskName );

Set aTask_TaskJobs = aTask.getTaskJobs();

// define a new TaskJob for this Task
TaskJob aTaskJob = new TaskJob();
aTaskJob.setJob( new Integer(1) );
aTaskJob.setTask( aTask );

// add this new TaskJob to this Task
aTask_TaskJobs.add( aTaskJob );

HibernateUtil.commitTransaction();
}
catch (InfrastructureException iex) {
System.out.println( "index.jsp: iex.getMessage() = " + iex.getMessage() );
HibernateUtil.rollbackTransaction();
}
finally {
HibernateUtil.closeSession();
}

The funny thing is I am not even setting the Set "aTask_TaskJobs" back in the Task object after adding a TaskJob object to it. Still Hibernate saves it. This is quite dangerous. I must be doing something wrong. Any input?