1 Reply Latest reply on Mar 7, 2002 7:25 PM by Dain Sundstrom

    Can you explain this? Weird behavior when changing a field.

    Vicent Ramon Palasí Lallana Newbie


      I am newbie to JBoss and I am making my first CMP program following the example found at the free volunteer documentation. I use PostgreSQL but this is not important for my question.

      I programmed a Web application "llibre.jar", which manages a database table of Books, the same way as the documentation example, "cd.jar" manage a table of CDs.

      I have also programmed a client ("LLibreClient")which displays the title of the first book in the table. I run this client with help of the following file (named "run.bat"-I am working with Windows)

      set CP= <... here the classpath ...>
      java -Djava.naming.factory.initial=org.jnp.interfaces.NamingContextFactory -Djava.naming.provider.url=localhost:1099 -Djava.naming.factory.url.pkgs=org.jboss.naming:org.jnp.interfaces -classpath %CP% CMPBiblio.LlibreClient

      THIS WORKS GREAT but I found a weird behavior and I would like the CMP experts to explain me.

      Let us suppose that the first row of the table contains a book named "Romeo and Juliet" (that is, the contents of its field "title" is "Romeo and Juliet"). When I run the client, the following sentence is displayed on screen:

      First book title: "Romeo and Juliet".

      But, now, I change the field "title" of the first row (from OUTSIDE the program, that is, from PostgreSQL directly, without using the client neither JBoss), to "The Bible". Then, I run again "run.bat" and I get

      First book title: "Romeo and Juliet".

      That is, the program has not become aware about the change of field. I have to restart JBoss in order to get what I want, that is:

      First book title: "The Bible".

      (This problem does not occur if I change the field from the same client, only when I change the field from outside JBoss).

      Is this JBoss normal behavior? I find it extremely weird. Or am I doing something bad?

      Thanks for your help,

      Vicent Palasí