Which class do you use to handle an incoming JSON Message as a stream?

Which statement is true about JAX-RS resource implementation?

Given:

You are creating an Alarm management system. When you create a new alarm, you want it to create an alert that is triggered once at the specified time.
Which method should you call on Line 9 to create the timer?

What is true about Message-Driven Beans (MDBs)?

For an Item to be enabled for back-to-back order process, which attribute do you need to set?