Question

When I inject EJB 3.1 beans into POJO created by @Inject then injection works. When I construct POJO on my own then it doesn’t (Glassfish v3). Is it correct behavior?

My classes (in EJB module):

@Singleton
@LocalBean
@Startup
@Named
public class NewSingletonBean {

    @PostConstruct
    public void init(){
        System.out.println("NewSingletonBean INIT");
    }

}

_

public class MyPOJO {
        @Inject NewSingletonBean newSingletonBean;

        public void sth(){
            System.out.println("EJB injected into POJO: " + (newSingletonBean != null));
        }
}

This does not work:

@Singleton
@LocalBean
@Startup
@DependsOn(value="NewSingletonBean")
public class NewSingletonBean2 {

    @Inject NewSingletonBean newSingletonBean;

    @PostConstruct
    public void init(){
        System.out.println("NewSingletonBean2 INIT");
        System.out.println("EJB injected into EJB: " + (newSingletonBean != null));
        MyPOJO p = new MyPOJO();
        p.sth();
    }

}

_

And this works OK:

@Singleton
@LocalBean
@Startup
@DependsOn(value="NewSingletonBean")
public class NewSingletonBean2 {

    @Inject NewSingletonBean newSingletonBean;
    @Inject MyPOJO p;
    @PostConstruct
    public void init(){
        System.out.println("NewSingletonBean2 INIT");
        System.out.println("EJB injected into EJB: " + (newSingletonBean != null));
        p.sth();
    }

}

I’m using NetBeans 7.0.1.

dist directory structure:

│   CDITest.ear
│
└───gfdeploy
    └───CDITest
        ├───CDITest-ejb_jar
        │   │   .netbeans_automatic_build
        │   │   .netbeans_update_resources
        │   │
        │   ├───META-INF
        │   │       beans.xml
        │   │       MANIFEST.MF
        │   │
        │   └───tries
        │           MyPOJO.class
        │           NewSingletonBean.class
        │           NewSingletonBean2.class
        │
        ├───CDITest-war_war
        │   │   index.jsp
        │   │
        │   ├───META-INF
        │   │       MANIFEST.MF
        │   │
        │   └───WEB-INF
        │       └───classes
        │               .netbeans_automatic_build
        │               .netbeans_update_resources
        │
        └───META-INF
                MANIFEST.MF

Unpacked EAR structure:

│   CDITest-ejb.jar
│   CDITest-war.war
│
└───META-INF
        MANIFEST.MF

Unpacked EJB module jar structure:

├───META-INF
│       beans.xml
│       MANIFEST.MF
│
└───tries
        MyPOJO.class
        NewSingletonBean.class
        NewSingletonBean2.class

Is it correct behavior?

Answer 1

The following part might be an answer to your question:

As per CDI 1.0 specification:

3.7. Bean constructors

When the container instantiates a bean class, it calls the bean
constructor. The bean constructor is a constructor of the bean class.

The application may call bean constructors directly. However, if the
application directly instantiates the bean, no parameters are passed
to the constructor by the container; the returned object is not bound
to any context; no dependencies are injected by the container; and
the lifecycle of the new instance is not managed by the container.

HTH!