Why is metadata being defined to provide for a JNDI name which will be
used to bind the JAX-RS/EJB instance?
Thanks,
Joel Smith
Marc Hadley <Marc.Hadley_at_Sun.COM>
Sent by: Marc.Hadley_at_Sun.COM
12/08/2008 09:51 AM
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Re: JSR311: JAX-RS and EJB
Last call for comments and preferences.
A slight tweak for #2 and #3 is that we'll need a way to specify an
interface name if a bean implements more than one but that should be
straightforward.
I'm leaning towards #3 since it is minimally invasive for application
code.
Marc.
On Nov 24, 2008, at 11:36 AM, Marc Hadley wrote:
> Experts,
>
> Its time to start discussing the work we want to do for the first
> maintenance release of JAX-RS. For 1.1 we'll be concentrating on
> alignment with EE 6 and fixing any bugs that may have come to light
> since 1.0 was finalized.
>
> One significant issue that we've only briefly touched on before is
> how to combine JAX-RS and EJB in a portable way to expose an EJB
> directly as a JAX-RS resource. There are a couple of technical
> issues that prevent that today:
>
> (i) Given an EJB class name there's no portable way to work out the
> JNDI name to use to obtain an instance.
> (ii) Given a JNDI name one can lookup an instance but, at least for
> the no-interface variant, the JAX-RS annotations will not be present
> on the returned proxy.
>
> We discussed this with the EJB and EE spec leads and came up with
> the following three potential solutions:
>
> (1) Declare a dependency on a resource EJB somewhere. E.g.:
>
> @EJB(name="OrdersResourceRef",
> beanInterface=com.acme.OrdersResource.class)
>
> is placed on the Application class. The JAX-RS runtime will use the
> following lookup to obtain an instance:
>
> OrdersResource o = (OrdersResource)
> new InitialContext().lookup("java:comp/env/OrdersResourceRef");
>
> and will reflect on the com.acme.OrdersResource.class to determine
> the JAX-RS annotations.
>
> (2) Declare the JNDI name on the resource class. E.g.:
>
> @Stateless
> @Path("somepath")
> @JNDIName("OrdersResourceRef")
> public class OrdersResource { ... }
>
> Assuming the name is added to the global namespace, the lookup to
> obtain an instance is:
>
> OrdersResource o = (OrdersResource)
> new InitialContext().lookup("java:global/OrdersResourceRef");
>
> The JAX-RS runtime will reflect on the resource class as normal.
>
> (3) Introduce a new java:module/... context that contains all
> components in the current module. Given:
>
> @Stateless
> @Path("somepath")
> public class OrdersResource { ... }
>
> The JAX-RS runtime would use the following lookup to obtain an
> instance:
>
> OrdersResource o = (OrdersResource)
> new InitialContext().lookup("java:module/OrdersResource");
>
> and will reflect on the resource class as normal.
>
> Thoughts, comments, preferences ?
>
> Thanks,
> Marc.
>
> ---
> Marc Hadley <marc.hadley at sun.com>
> CTO Office, Sun Microsystems.
>
>
>
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---
Marc Hadley <marc.hadley at sun.com>
CTO Office, Sun Microsystems.
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