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POHow to get a 'JBoss service' with CDI in JMX with AS6?
 

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  1. POHow to get a 'JBoss service' with CDI in JMX with AS6?
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    <p>I'm currently migrating a JBoss service class from AS5.1 to AS6 (not going to AS7 for a variety of reasons). </p> <p>For AS5.1, the service implements a {serviceName}MBean and has a jboss-service.xml with attribute values. It's packaged in a jboss-sar, which is packaged in an EAR to be deployed. When deployed, the service fields are populated with the values from jboss-service.xml, and the service is automatically registered into JMX.</p> <p>I would like to achieve the same thing using AS6, but would like the service to support CDI - so I'd like its new @Inject injection points to be satisfied. I need these to be satisfied in the object registered with JMX, so that methods called via JMX can reference injected fields, but I'm struggling to achieve this.</p> <p>I've had to package the service in a jar, instead of a jboss-sar, for classloader reasons, but let's say it's otherwise unchanged. When deployed to AS6, all works as before - service goes into JMX, values from XML propagate to the object. However, the instance created does not have its CDI injection points satisfied, and neither does the object registered in JMX.</p> <p>If I annotate the service class with @Startup and @javax.ejb.Singleton, but keep its interface and the jboss-service.xml, the object registered into JMX still does not have its CDI injection points satisfied. However if I programmattically deregister that bean, and re-register the instance in a @PostConstruct method, then the bean in JMX DOES have its injection points satisfied. However that bean no longer has the values specified in the jboss-service.xml.</p> <p>So how can I get the best of both worlds? CDI and the usual JBoss service behaviour? What is the correct way to implement a JBoss service with CDI? I've been unable to find documentation on this. Hope someone can help.</p> <p>Thanks,</p> <p>Ben</p>
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    1. COIn J2EE terms, what kind of thing is a JBoss service? Is it an EJB, a servlet, a JAX-WS handler, or what? Or (as i suspect) is it not any kind of J2EE object? If it isn't, it's not clear that CDI can be applied to it. You mention trying making it a @Singleton, but it seems that what that does is makes the class play two disjoint roles - it is instantiated as an EJB, and separately instantiated as a service. The EJB copy gets injected, the service copy doesn't; the service copy gets the jboss-service.xml configuration, the EJB copy doesn't.
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      1. POHow to get a 'JBoss service' with CDI in JMX with AS6?
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    2. COApologies for being the bearer of bad news! Could you split the service into two parts - an EJB, and a sort of lightweight service adaptor which is loaded and configured via a jboss-service.xml, and does one explicit JNDI lookup to get hold of the bean?
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    3. COI think you're spot on with EJB/service behaviour in your first comment, Tom. I was thinking that it would still be treated as a bog-standard CDI managed bean - so would be able to have CDI. Appears not to be the case. Will definitely look into the 2-part service implementation...
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