6 Replies Latest reply on Mar 3, 2003 1:50 PM by petertje

    Entity Bean cache problem

    zyfno1
    zyfno1 Feb 27, 2003 10:44 PM

      My application is transfered from IBM Websphere. There are some matters. The one is entity bean's cache problem. I do not want the cache and how can I do?

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        • 1. Re: Entity Bean cache problem
          petertje Feb 28, 2003 5:46 AM (in response to zyfno1)

          > There are some matters. The one is entity bean's
          > cache problem. I do not want the cache

          Why not??? It won't do any harm, if you set the commit option correctly, it will re-load the entity from the database for every transaction.

          Peter

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          • 2. Re: Entity Bean cache problem
            zyfno1
            zyfno1 Mar 1, 2003 10:15 AM (in response to zyfno1)

            I used to change the value of a record with the Third Party tools or other SQL. But once I accessed the record from Entity Bean, The value resumed original state.
            This matter due to the cache of Entity Bean. Actually I want to save the value changed by the Third Party tools. So I want to know the solvent.

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            • 3. Re: Entity Bean cache problem
              petertje Mar 1, 2003 3:46 PM (in response to zyfno1)

              You should use commit option B.
              Quote from the ejb spec (chap. 10.5.9):
              "In this option the Container does not ensure that the instance has exclusive access to the state of the object in the persistent storage. Therefore, the Container must synchronize the instance's state from the persistent storage at the beginning of the next transaction"

              With JBoss, you can set the commit option in the container configuration; see standardjboss.xml in the /server/default/conf directory.

              Cheers,
              Peter

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              • 4. Re: Entity Bean cache problem
                zyfno1
                zyfno1 Mar 1, 2003 10:32 PM (in response to zyfno1)

                Thanks a lot.
                I had find the xml file and locate container-configuration. My EntityBean is 1.1 BMP EntityBean and what will I do next step?

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                • 5. Re: Entity Bean cache problem
                  zyfno1
                  zyfno1 Mar 1, 2003 10:39 PM (in response to zyfno1)

                  Oh I have got it.
                  Can you tell me the meaning of Option A. Where can I get the spec (Ejb spec (chap. 10.5.9))?

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                  • 6. Re: Entity Bean cache problem
                    petertje Mar 3, 2003 1:50 PM (in response to zyfno1)

                    > Can you tell me the meaning of Option A.
                    The container can assume it is the only one accessing the database, so it can cache entity data and use it in a transaction without reload it first.

                    > Where can I get the spec (Ejb spec (chap. 10.5.9))?
                    You can download the spec from http://java.sun.com
                    And of course, any good ejb book should explain it also...

                    Hth
                    Peter

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