Posted under Glassfish
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Tags EJB, JNDI, Tutorial
Much of this has already been covered here, but I am posting these somewhat raw notes from an earlier investigative email as they include one or two links and points not covered elsewhere. I don’t have the time or inclination at present to rework everything into an existing post :-
1/ For local beans, you can just use defaults in @Stateless (in the bean) and in @EJB (in the referring code)
Note that when you do not use all the defaults, you must declare both the beaninterface and the name attributes
@EJB(name=”ejb/JPAGlassFishIce/SimpleBean”, beanInterface=SimpleBeanLocal.class)
private SimpleBean simpleBean;
2/ For remote beans, you can use e.g.
@Stateless(mappedName=”ejb/JPAGlassFishIceEJB/SimpleBean”)
Then
@EJB(beanInterface=SimpleBeanRemote.class, mappedName=”ejb/JPAGlassFishIceEJB/SimpleBean”)
private SimpleBean simpleBean;
Note – you must pass the class of the remote interface as above or it will not work, and you just get name not found exception.
3/ The above methods work for both access from one bean to another, and from a JSF managed bean to a remote (or local) bean
It also works from any POJO called from e.g. a JSF manged bean.
Note that this ability is container specific – Glassfish does it, other containers may vary in what/if/how they support.
4/ If doing JNDI lookups yourself to a local bean (via context.lookup), you need to add <ejb-local-ref> to web.xml as follows :-
<ejb-local-ref>
<ejb-ref-name>ejb/JPAGlassFishIce/SimpleBean</ejb-ref-name>
<ejb-ref-type>Session</ejb-ref-type>
<local-home></local-home>
<local>uk.co.salientsoft.jpaglassfishice.domain.SimpleBeanLocal</local>
</ejb-local-ref>
This would be used if using e.g. Spring or a custom EL resolver to inject references into JSF managed beans (via JSF DI)
Note that the JNDI name for the above local reference would be
“java:comp/env/ejb/JPAGlassFishIce/SimpleBean”
i.e. this is picking up from the <ejb-ref-name> above, and is prefixed java:comp/env
java:comp/env is a reference to the JNDI “Environment” service provider for Java EE
you can also use this to look up environment variables etc.
see here http://java.sun.com/developer/technicalArticles/xml/WebAppDev4/
The <ejb-local-ref> stuff is done for you automatically if you use @EJB
5/ Note that JNDI names are container specific at present (fixed in java ee6)
See here for a good SUN post on all the EJB reference stuff :-
https://glassfish.dev.java.net/javaee5/ejb/EJB_FAQ.html
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