accessing entity beans with servlets

[navneet]

Hi,

I have an container managed entity bean which implements loachome interface and i want to access this from a servlet.

i have put the servlet in a WAR file and the entity beans with the interfaces are in a jar file. And both these war and jar are in one EAR file

My ejb-jar.xml look like the folloing
----------------------------------------
...
<ejb-jar>
<enterprise-beans>

<display-name>User</display-name>
<ejb-name>User</ejb-name>
<local-home>mobile.entity.LocalUserHome</local-home>
mobile.entity.LocalUser
<ejb-class>mobile.entity.UserBean</ejb-class>
<persistence-type>Container</persistence-type>
<prim-key-class>java.lang.String</prim-key-class>
False
<cmp-version>2.x</cmp-version>
<abstract-schema-name>User</abstract-schema-name>
<cmp-field>
<field-name>username</field-name>
</cmp-field>
.....
-------------------------------------

while the web.xml looks the following
-------------------------------------
...
<web-app>
<ejb-ref>
<ejb-ref-name>local/User</ejb-ref-name>
<ejb-ref-type>Entity</ejb-ref-type>
mobile.entity.LocalUserHome
mobile.entity.LocalUser
<ejb-link>User</ejb-link>

</ejb-ref>

</web-app>
-------------------------------------------

and my code in the servlet is like this:
---------------------------------------------
....
Object objRef = ctx.lookup("java:comp/env/ejb/User");
LocalUserHome home=(LocalUserHome)PortableRemoteObject.narrow(objRef, LocalUserHome.class);
....
----------------------------------------------

but this gives me an error

16:40:06,250 ERROR [STDERR] javax.naming.NameNotFoundException: User not bound
16:40:06,250 ERROR [STDERR] at org.jnp.server.NamingServer.getBinding(Naming
Server.java:495)
....


Am i doing something wrong. Can i access the entity bean with local interface from the servlet in same EAR. Please help

[seven]

I am not sure if u really can do that, I mean access a bean's local interface from an external domain (servlets). I think any bean should have a remote interface in order to be accessed by a client that is calling from outside the jboss.

[jmoring]

You need a local ref in your web.xml. Here is an example

<ejb-local-ref>
<ejb-ref-name>ejb/local/ClientSupportModel</ejb-ref-name>
<ejb-ref-type>Session</ejb-ref-type>
<local-home>com.clarity.admin.ClientSupportModelLocalHome</local-home>
com.clarity.admin.ClientSupportModelLocal
<ejb-link>ClientSupportModel</ejb-link>
</ejb-local-ref>


Access it via: "java:comp/env/ejb/local/ClientSupportModel"

[navneet]

Hi jmoring,

I tried to give the ejb-local-ref in web.xml but it gives be an xml error that ejb-local-ref is not a valid tag.

I am using the following doctype:

<!DOCTYPE web-app
PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.2//EN"
"http://java.sun.com/j2ee/dtds/web-app_2_2.dtd">


even if you go to the above url you will see that ejb-local-ref is not defined.

thanks for help anyway!

[nhebert]

Navneet,

From the previous exchanges about your web.xml and its
DTD being ".../DTD Web Application 2.2..." then perhaps
you trying to use J2EE 1.2? Are you using JBoss 2.x or
3.0? This is important as this limits your choices of
accessing an entity bean efficiently.

If you are using JBoss 3.0 it is possible to use an
Entity Bean via its local interface from a co-deployed
servlet. If you are using JBoss 2.x then, as you have
discovered, you cannot do that.

What version of JBoss are you using?

After knowing that we can help you.

Cheers,

Noel.

[nhebert]

Naveet,

I may have been too quick on the reply!

Since after reading your post (again) I
noticed in your ejb.jar xml that you reference
<cmp-version>2.

Hmmm, this then indicates that you *may* be using
JBoss 3

It is a concern that your web.xml DTD on the other hand
refernces Servlet 2.2 which is part of J2EE 1.2. This
could cause a problem with JBoss 3.0 especially since
you said you are 2.2 and you intend to use a 2.3 feature.

Just a thought.

Cheers,

Noel.

[navneet]

Hi nhebert,

thanks for your help. I think the DTD is the problem. I should have used 2.3. It was a mistake as i copied the DTD from another file which was for earlier version.