Ales,
I am reading your article 'Spring and EJB 3.0 in Harmony'
Quote:
anonymous wrote :
| However, one big problem with EJB 3.0 dependency injection is that there's
no way of configuring, defining, and injecting plain Java beans.
| You can only inject Java EE component types and <env-entry> only lets you
inject primitive types. Sure, EJBs look a lot like POJOs and JBoss has the
concept of a @Service bean, which is a singleton, but do we really have to
define and inject these component objects that have to run in containers?
| And what about beans from third-party libraries and pre-existing code.
|
Well, how about this?
| @Stateless
| public class OrderEntryBean implements OrderEntry {
|
| @PersistenceContext(unitName = "titan")
| private EntityManager manager;
|
| private PersonDao personDao;
|
| @Resource(name = "personDaoImplName")
| private String personDaoImplName;
|
| @PostConstruct
| public void postConstruct() {
| try {
| personDao = (PersonDao) (Class.forName(personDaoImplName))
| .newInstance();
| } catch (Exception e) {
| throw new ValidationException(e);
| }
| personDao.setManager(manager);
| }
| }
|
| <enterprise-beans>
| <session>
| <ejb-name>OrderEntryBean</ejb-name>
| <env-entry>
<env-entry-name>personDaoImplName</env-entry-name>
|
<env-entry-type>java.lang.String</env-entry-type>
| <env-entry-value>
| com.arno.dao.impl.PersonDaoImpl
| </env-entry-value>
| </env-entry>
| </session>
| </enterprise-beans>
|
It might be heavy, it might be not-elegant the way Spring provides solution
(LOC), injected object cannot be configured externally. But to all practical
purposes as long as a class has an interface it can be injected into EJB and
serve the purpose of injection - runtime definition of implementation. Not so?
;)
Cheers,
Arno
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