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javajakarta-eeejbjboss7.xserviceloader

ServiceLoader + EJB injection

I would like to know if I can combine the ServiceLoader with EJB and injection from Java EE 6.

Imagine I have an interface ServiceI that can be implemented by two EJB stateless beans BeanA and BeanB.

If I register these two classes in the MEAT-INF/services they will be instantiated in the Java SE way, rather than being managed by the Application Container (like when you use @Inject). This means that annotations like @Inject or @PostConstruct won't be resolved.

Is it possible to have something like a ServiceLoader which would allow me to go through EJB beans implementing a given interface and returning one based on some criteria?

Solution

  • I have found a solution.

    If both beans implements the Service interface you can do the following:

    @Inject
private javax.enterprise.inject.Instance.Instance<Service> services

    services implements Iterator<Service> and will allow to cycle through all the beans that implement the Service interface.

    Then you can choose one of the implementations based on some criteria and you have the equivalent of ServiceLoader for EJB!