JavaEE: Context and Dependency Injection

Real important Annotation for your injectable Class!

@Named
public class DateConvertHelper implements Serializable {

   // ...

}

If you forget to add the Annotation @Named the Container will not be able to get an object of yout Helper-Class if he needs one.
Also dont forget to implement Serializable, it would produce an Exception while deploying your application to the aplication server.