Creating simple JMS application, understand JMS with basic example, JMS queue example

I hope you already have a basics of the JMS concpet, a bit more about it in different way.

1. when to use JMS or when a test case or secanrio to eligible for use JMS?
    1. When you want to decouple an application  and keep it loosly coupled with
    other systems/modules.
    2. When your application is growing and has growing responsibility to maintain
    interaction with modules.
    3.