Access environment properties in EJB3

Create a stateless session bean

@Stateless(name="personBean")
@Local(PersonManager.class)
public class PersonManagerBean implements PersonManager {

    @PersistenceContext(unitName="unit")
    private EntityManager em;
    
    @Resource
    private String defaultName;
    
    @Override
    public void save(Person person) {
        em.persist(new Person(defaultName));
    }
}

The defaultName is to be injected

In ejb-jar.xml

<enterprise-beans>
    <session>
        <ejb-name>personBean</ejb-name>
        <env-entry>
            <env-entry-name>
                session.PersonManagerBean/defaultName
            </env-entry-name>
            <env-entry-type>java.lang.String</env-entry-type>
            <env-entry-value>Tom</env-entry-value>
        </env-entry>
    </session>
</enterprise-beans>

Now the defaultName is initialised with the value ‘Tom’.

The xml equivalence of @Resource annotation:

<enterprise-beans>
    <session>
        <ejb-name>personBean</ejb-name>
        <env-entry>
            <env-entry-name>
                session.PersonManagerBean/defaultName
            </env-entry-name>
            <env-entry-type>java.lang.String</env-entry-type>
            <env-entry-value>Tom</env-entry-value>
            <injection-target>
                <injection-target-class>
                    session.PersonManagerBean
                </injection-target-class>
                <injection-target-name>
                    defaultName
                </injection-target-name>
            </injection-target>
        </env-entry>
    </session>
</enterprise-beans>