what is the use of JMS?
In which situations we are using JMS?
Can we send message from one server to another server using JMS?

You can use it in the context of mutithreading but it means JMS is not meant for Multithreading. Its basically meant for object communication.

It will be useful when you are writing some event based applications like Chat Server which needs a publish kind of event mechanism to send messages between the server to the clients who got connected with the server.

Moreover JMS gives Loosely-coupled kind of mechanism when compared with RMI which is tightly-coupled. In JMS there is no need for the destination object to be available online while sending a message from the client to the server. But in RMI it is necessary. So we can use JMS in place of RMI where we need to have loosely-coupled mechanism.

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