CODEWITHSUNDEEP
javaspringjakarta-eedependency-injection
vdenotaris
vdenotaris

Reputation: 13637

How to inject an external-defined class in Java EE

Supposing I would like to use a Foo class defined by an external library written in JavaSE (and assuming that I cannot edit it).

In Spring, I can declare this class as bean by writing:

@Bean
public Foo foo() {
    return new Foo();
}

Then, it is possible to perform the DI:

@Autowired
private Foo foo;

Is there a way to do the same in Java EE (if possible, by avoiding the inheritance)?

Upvotes: 2

Views: 526

Answers (1)

maress
maress

Reputation: 3533

In CDI, you dont even have to annotate the pojo.

Consider that the following has been declared in an external library:

public class MyService{}

And then in your project, you can have a stateless ejb or just another CDI bean.

@Stateless
public class MyController{

 @Produces
 public MyService getMyService(){
  return new MyService();
 }
}

Now from somewher else in your controller

@SessionScoped
@Named
public class MySessionController implements Serializable{
  //simple, just inject and the producer method will be called automatically
  @Inject
  private MyService service;
}

You need to check on Producers and Stereotypes from the url:

Producers and Stereotypes

Upvotes: 4

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