Why to use JMS????

Hi All,
i am new to JMS, can any body tell me Why to use JMS??
i know it used to send message but for why???
if u answer me with an example it will be useful for me.
thanks in advance.

Hi,
Well one very good reason to use JMS is to keep applications that produce information decoupled from applications that consume information. With this decoupled approach, you can any number of producers and consumers sending and processing information...thus making your solution very scalable.
If you think of an online ordering system. A user plugs in a bunch of information about a product they wish to order. Once the form is completed, they hit the submit button. Now you can take one of two approaches:
1. You can have an Enterprise Java Bean ( EJB ) service the order request. That EJB could then communicate with other EJBs within an inventory system to perform a bunch of checks and eventually hand it off to the appropriate system to fulfill the order. From the user's perspective, they are going to have to wait until all of that processing has completed before they can move on. Not a very nice situation. There is a potential that the user could be sitting on their order screen for mintues!!
2. The other approach is to wrap all of the information supplied on the order form into a JMS message and forward the message to an appropriate Topic or Queue. On the other side of that Topic or Queue an inventory system subscribes for order messages. The nice thing about this approach: as soon as the message is sent off to the Topic or Queue, the user regains control of the screen and can continue browsing. Another benefit, you can have multiple consumers processing orders.
I apologize for the length of the response. These are only two benefits of using a Messaging-based approach....there are many, many more.
Regards,
J.

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Hi all,
          I have a doubt .I just want to know wether i can use JMS in this situation.
          By the end of processing in our module, we will have a ServiceRequest.Now we
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          is residing on another machine.
          So i was thinking of this
          1)our module end point is a servlet.
          2)there i construct the xml string with all the info related to
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          3)after that i create a text message and post it to JMS queue on another
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          4)Then there is an MDB which recieves the request using onMessage method
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          I was also just thinking,JMS is for asynchronous communication.
          Now don't u think that i can achieve this kind of asynchronous communication
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          module.That way also i acheive kind of asynchronous communication(i.e am not
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          So i just want to know is this the right scenario for going for JMS or we r
          just complicating things.
          Thnx in Advance
          Veena.


JMS is ideal for asynchronous behaviour, why try to build your own
          asynchornous behaviour. If you want to have two processes just for async
          behavior, u have to take into account many other issues, like one process
          going down. How would you scale your application.
          Why can't ur first servlet write directly to the database?
          -Vikas
          "Veena" <[email protected]> wrote in message
          news:[email protected]...
          > Hi all,
          >
          > I have a doubt .I just want to know wether i can use JMS in this
          situation.
          >
          > By the end of processing in our module, we will have a ServiceRequest.Now
          we
          > have to pass that ServiceRequest related information to other module which
          > is residing on another machine.
          >
          > So i was thinking of this
          >
          > 1)our module end point is a servlet.
          > 2)there i construct the xml string with all the info related to
          > ServiceRequest.
          > 3)after that i create a text message and post it to JMS queue on another
          > server(module)
          > 4)Then there is an MDB which recieves the request using onMessage method
          > and then that ServiceRequest related changes r made in the db.
          >
          > Is JMS an ideal solution in this scenario.
          >
          > I was also just thinking,JMS is for asynchronous communication.
          > Now don't u think that i can achieve this kind of asynchronous
          communication
          > by sending(posting using HttpURlConnection) the xml messaage from servlet1
          > in server 1 to servlet 2 in other module(server2) and have the jdbc code
          to
          > save the data related to ServiceRequest in the servlet in the other
          > module.That way also i acheive kind of asynchronous communication(i.e am
          not
          > getting any response back).Why shud i use JMS then.
          >
          > So i just want to know is this the right scenario for going for JMS or we
          r
          > just complicating things.
          >
          > Thnx in Advance
          > Veena.
          >
          >
          >

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          poorni wrote:
          > Hello everyone,
          > I need to send an alert message from the client to a server(which is
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          Yes.
          If so can anyone please suggest me
          > an open source JMS provider.
          WebLogic has JMS built-in.
          > Thank you,
          > poornima

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