Spring: Attaching @Qualifer to Java-configured beans

Question

In spring, you can XML-configure a bean to have a qualifier. I can't seem to find how I can attach a qualifier if configuring beans through Java annotations. What's up with that? Do I have to use just plain old names?

Solution 1

If you're using annotations (not Java based configuration), you can use the following to add a qualifier (see the Spring documentation):

@Component
@Qualifier("myQualifier")
public class MyBean {
    //code
}

And to wire in the bean, use the following (again, see the Spring documentation):

public class MyClass {

    @Autowired
    @Qualifier("myQualifier")
    private MyBean myBean;

    //more code

}

Solution 2

What, like @Qualifier, you mean?

3.10.4 Defining bean metadata within components

Example:

  @Bean @Qualifier("public")
  public TestBean publicInstance() {
      return new TestBean("publicInstance");
  }

Comments

[Snowy Coder Girl]

+1. See also my answer for autowiring (didn't add it here b/c code would be hard to read).

[Nick]

And what's wrong with @Component("componentName")? How @Component @Qualifier is better?

[levant pied]

@Nick You can qualify multiple components with the same qualifier. Think of it as a grouping concept.