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EJB design: How to pass Object by Reference over the network in ejb?

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  1. How to pass Object by Reference over the network in ejb? (9 messages)

    • Posted by: Web Master
    • Posted on: September 06 2000 09:11 EDT
    Dear Friends,
              I am calling a method of session bean in ejb client. I am passing a vector to this method. I want the vector to be passed by reference so that whatever changes I make in it in session bean method, these are reflected beack in client without returning the vector.
    In general, how to pass the objects by reference over the network?

    Varun
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    Threaded Messages (9)

  2. How to pass Object by Reference over the network in ejb?[ Go to top ]

    Varun,

      In RMI (the communications protocol used by EJB), the vector you pass over gets serialized. That is, a complete copy of its current state gets passed over the wire to the EJB, which "deserializes" it into a copy of the original vector. I don't know of any way to pass by reference. You will just have to return a vector.

    Floyd
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  3. How to pass Object by Reference over the network in ejb?[ Go to top ]

    Support!
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  4. How to pass Object by Reference over the network in ejb?[ Go to top ]

    Hi,
    One Basic concept in RMI is nothing like pass by referance.All the parameters paased to the method are pass by value only.
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  5. How to pass Object by Reference over the network in ejb?[ Go to top ]

    You can instantiate RMI object which wraps your Vector and use it. This will achieve 'pass by reference' functionality.
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  6. How to pass Object by Reference over the network in ejb?[ Go to top ]

    Hi Dimitri Rakitine,

    Can you please elaborate on this point.
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  7. How to pass Object by Reference over the network in ejb?[ Go to top ]

    You can create RMI remote object in your client and use it as a parameter when calling your server - that will achieve 'pass by reference' behaviour.
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  8. How to pass Object by Reference over the network in ejb?[ Go to top ]

    For a heavyweight component making it an EJB could be a good solution, too. Maybe your vector is semantically just a property of a broader business logic object...
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  9. How to pass Object by Reference over the network in ejb?[ Go to top ]

    I believe that RMI simulates pass by reference by passing a stub of the remote object by value. That is, it serializes the stub and passes the stub to the other side.

    See page 521 of Mastering EJB which is downloadable from this site.

    -David
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  10. Re: How to pass Object by Reference over the network in ejb?[ Go to top ]

    You should see page 572 of the new version of the book:Mastering Enterprise JavaBeans 3.0
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