Malcolm,
We looked into this carefully and found that modules are not
automatically decomposable. It is not possible to reliably automatically
subset java code in a jar file. For instance it is not possible to
determine what subtypes of a parameter type are needed for full use of a
Java object.
J2EE considers all jar files as architecturally indivisible.
-- Mark
Malcolm Sparks wrote:
>
> Hi,
>
> The J2EE specification introduces the notion of modules containing one
> or more components of the same module type (ejb, web, etc..).
> Furthermore, on page 8-1, the J2EE spec. refers to component
> libraries. Suppose that I wish to reuse one of the components from a
> module or library, for example, in a new application assembly. The
> specification as it currently stands means I have to take all the
> components from a module, since there is no way to infer which files
> from the ejb-jar must be extracted. An EJB may have certain
> dependencies, such as other non-EJB Java classes, gif files, etc..
>
> Would it not be useful to add an entry to the Bean's deployment descriptor,
> explicitly stating each dependency?
>
> For example, illustrating the use of a possible tag (jar-entry):
>
> <ejb-jar>
> <enterprise-beans>
>
> <session id="Bean1">
> <ejb-name>MySession</ejb-name>
> <home>com.wombat.empl.EmployeeServiceHome</home>
> <remote>com.wombat.empl.EmployeeService</remote>
>
> <jar-entry>com/wombat/empl/EmployeeServiceAdmin</jar-entry> <!-- see page 30
>of EJB1.1 -->
> <jar-entry>com/wombat/resources/logo.gif</jar-entry>
>
> </session>
>
> <session id="Bean2">
> <description>
> I'm not interested in using this Bean
> </description>
> </session>
>
> </enterprise-beans>
> </ejb-jar>
>
> This way, if I wanted to use Bean1, but not Bean2, I could extract it
> out of the jar into my new ejb-jar, perhaps to form part of a new
> assembly.
>
> Have I missed something?
>
> Malcolm
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