Can you copy/paste the WebLogic complaint into an email back to this
list? I'm curious; I don't remember that in the spec and even if it
was, would argue why they would allow free-form text in the ejb-jar.xml
for <home> and <remote> if we couldn't re-use valid interfaces in them.
What exact version (and service pack) of WebLogic? I'd like to give
it a go...
--
[EMAIL PROTECTED] wrote:
> That's an interesting topic, if I might butt in :) The technique you
> mentioned below works great in jBoss, but when I tried to port the same code
> to another server running Darth WebLogic, it complained about some obscure
> j2ee specification requiring the home and remote interfaces being *unique*
> or having the same name as the EJB.
>
> The technique you use below is very powerful, as it allows a layer of
> abstraction. My question then is the technique below legal?
>
> Wes
>
> -----Original Message-----
> From: David Ward [mailto:[EMAIL PROTECTED]]
> Sent: Monday, July 02, 2001 10:18 AM
> To: [EMAIL PROTECTED]
> Subject: Re: [JBoss-user] Casting home interface to correct bean type
>
>
> Chris,
>
> You shouldn't have to cast your home interfaces; in fact, you can share
> the same remote and home interface for all your "Form" EJB
> implementations. Try this, for example:
>
> // interfaces/beans
>
> public interface Form extends EJBObject;
> public interface FormHome extends EJBHome;
> public class FooForm implements SessionBean;
> public class BarForm implements SessionBean;
>
> // inside servlet (bad code for ease of example)...
>
> public void service(HttpRequest req, HttpResponse res) {
> String formName = req.getParameter("formName");
> try {
> InitialContext ctx = new InitialContext();
> Object ref;
> if ( formName.equals("foo") )
> ref = ctx.lookup("java:comp/env/ejb/FooForm");
> else if ( formName.equals("bar") )
> ref = ctx.lookup("java:comp/env/ejb/BarForm");
> else
> // do something...
> FormHome home = (FormHome)PortableRemoteObject.narrow(ref,
> FormHome.class);
> Form form = home.create();
> // now use the generic form interface...
> } catch (Exception e) {
> throw new ServletException(e);
> }
> }
>
> Basically, your deployment descriptor will specifcy the same <remote>
> and <home> interfaces for both FooForm and BarForm, but will obviously
> have different <ejb-class>'s bound to different JNDI names. Your
> implementations of FooForm and BarForm can be radically different, but
> since you said they will have the same method signatures, the client
> code can just use the "Form" interface.
>
> Hope this helps,
> David
>
> --
>
> Chris Adams wrote:
>
>
>>Hi,
>>
>>Need some help with remote casting objects when using ejb's
>>
>>I'm going to have a set of bean which each represent a form. Each for has
>>the same set of methods, but they need to be independent ejb's because
>>
> each
>
>>has different details.
>>
>>The client is a servlet, which will receive a parameter
>>the type of form to return. This then needs to get the home interface of
>>the bean. I am going to have a properties file which pairs the form name
>>
> to
>
>>it's home interface class name.
>>
>>My problem is that the lookup method just returns an object, so how can I
>>cast this object to the correct home interface, as the type of form is not
>>know until the servlet is called.
>>
>>I've tried creating standard interfaces, which all form beans could
>>
> inheret
>
>>from, but came up with all sort of problems.
>>
>>I could use relfection to call the methods, but would prefer not to. Any
>>ideas.
>>
>>Many Thanks
>>
>>Chris Adams
>>
>>
>>
>>
>>Chris Adams
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>>==============================
>>
>>
>>
>>
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--
-----------------------------------------------------------------------
David Ward [EMAIL PROTECTED]
Senior Software Engineer http://www.dotech.com
Distributed Object Technologies, Inc. 716-381-8320 (phone)
500 Linden Oaks, Rochester, NY 14625 716-381-0598 (fax)
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