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POPersisting using hibernate/JPA
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copied!<p>I have been working with hibernate/JPA on JBoss for some months now and have one question that I can't find an answer or solution for.</p> <p>It seems like when creating new entity beans I'm not able to do a query before I at least have called EntityManager.persist(entityBean), or else I get the following error:</p> <p><code>TransientObjectException: object references an unsaved transient instance - save the transient instance before flushing</code></p> <p>An example:</p> <pre><code>Job job = new Job(); Collection<Task> tasks = job.getTasks(); //entityManager.persist(job); ActionPlan actionPlan = (ActionPlan) entityManager.createNamedQuery("ActionPlan.findByCommand"). setParameter("type", RunOperation.Install).getSingleResult(); Task task = Task.getTask(actionPlan); task.setActionPlan(actionPlan); tasks.add(task); task.setJob(job); </code></pre> <p>My problem is that I can't call createNamedQuery without first persisting 'job' (the line that is commented out). ActionPlan has a relation to Job, but the NamedQuery (findByCommand) does not join on Job. What bothers me is that I need to persist Job in order to query the database, when the new created Job is not even interesting in this context.<br> Moving the call to persist() to the end of the snippet yields the above mentioned error.</p> <p>I'm aware that the object I'm working on is not persisted, but persisting makes it impossible to rollback if an error occurs.</p> <p>I believe there is a solution for this, so if someone has the answer I would be very thankful. What am I missing?</p>

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