Injecting JBoss EJB3 beans into Tomcat6

Injecting EJB's into a managed bean (a bean spawned by appserver, of a JSF managed bean) inside an application server is simple:

public class AppManagedBean
{
   @EJB(mappedName="ejb/myBean")
   private MyBeanRemote session;

The container looks up the mapped bean and injects it. Easy.

However in tomcat it gets a little messy. Tomcat doesn't document how to inject them. It assumes something annotated with @EJB is in the context somewhere and tries to look it up.
It has documented how to lookup ejb's by defining entries in your context.xml or server.xml. But there isn't anything documented for defining EJB's. Looking at the soure it has support for <Ejb/> references but no real clue on how to configure it. So after stepping through the code I came up with the following soloution:

My environment is JBoss 5 running remotely (on localhost). A seperate instance of Tomcat 6. In it I have defined a session bean:

@Stateful(mappedName="userSession")
public class UserSessionBean implements UserSessionRemote 

This bean is used by a JSF backing bean (i.e. a managed bean):

public class TomcatManagedBean
{
   @EJB(name="ejb/myBean")
   private MyBeanRemote session;

In order for this bean to bound to the context, you need to configure Tomcat. There are 2 ways: in the server.xml or in the context.xml
I find that putting it in META-INF/context.xml is the easiest, as it gets reloaded nicely in Eclipse. The name="ejb/myBean" corresponds to the name attribute in the <Ejb/> below. In the URL is the appserver name, port, then the mapped name (it could be myProject/ejb/bean or whatever you feel like) - as long as it matched the mappedName on the EJB.

<Context>
   <!-- Makes Tomcat manage the ejb for you. -->
   <Ejb name="ejb/myBean" type="Session" factory="org.jnp.interfaces.NamingContextFactory" URL="jnp://localhost:1099/userSession" />
</Context>

Update 2010/02/02: Correct the mappedName in AppManagedBean