How to use constructor injection CDI with a JNDI resource?

Question

I'm trying to figure out how to use constructor injection in CDI where one of the parameters is a JNDI lookup.

With normal field injection, I can do the following:

@Stateless
public class Publisher
{

  @Inject
  @JMSConnectionFactory("java:/jms/remoteCF")
  private JMSContext context;

  @Resource(lookup="java:global/remote")
  private InitialContext externalContext;

  private Topic genericTopic;

  @PostConstruct
  public void init(){
       try {  
            Object obj = externalContext.lookup(TOPIC);  
            genericTopic = (javax.jms.Topic) obj;  
       } catch (NamingException namingException) {  

       }  
  }
}  

However, I would like to switch this bean to constructor injection. Unfortunately, I cannot figure out how to create a constructor which injects my externalContext resource, given that it is a JNDI lookup.

Example:

 @Inject
  public Publisher( @JMSConnectionFactory("java:/jms/remoteCF") JMSContext context,  @Resource( "java:global/remote") InitialContext externalContext ){
      this.context = context;
      this.externalContext = externalContext;
  }

But @Resource is not an allowable annotation as a parameter.

How can I specify that the externalContext parameter is a bean retrieved via a JNDI lookup? Where do I specify the JNDI name?

Answer 1

You have two options.

1. Create an injection point for your topic using a qualifier. Something like:

@Produces @Named(TOPIC) public Topic findTopic(JMSContext context) { return context.createTopic(TOPIC); }

and then inject that into your constructor

2. Create a producer field/qualifier for your InitialContext.

@Produces @Named("someName") @Resource("java:global/remote") private InitialContext externalContext;