callback method invocation for a timer that is created for a stateless session bean or a message-driven
bean may be called on any bean instance in the pooled state.
The following steps describe the life cycle of a stateful session bean instance:
- A session bean instance's life starts when a client obtains a reference to a stateful session bean instance through dependency injection or JNDI lookup, or when the client invokes a create<METHOD> method on the session bean's home interface. This causes the container to invoke newInstance on the session bean class to create a new session bean instance.
... in BMT your message is deleted from the queue and can't be recovered. ...
If a message-driven bean uses bean-managed transaction demarcation and throws a RuntimeException, the container should not acknowledge the message
When the ORDER BY clause is used in a query, each element of the SELECT clause of the query must be one of the following:
1. an identification variable x, optionally denoted as OBJECT(x)
2. a single_valued_association_path_expression
3. a state_field_path_expression
In the first two cases, each orderby_item must be an orderable state-field of the entity abstract schema type value returned by the SELECT clause. In the third case,the orderby_item must evaluate to the same state-field of the same entity abstract schema type as the state_field_path_expression in the SELECT clause.
FROM Employee e JOIN e.department d
ORDER BY d.name, e.name DESC