如何避免具有相同ID的bean？

Question

I have a problem familiar with this bean override

2 beans are with same id, but their package is different. Bean A was overridden by bean B. I spent lots of time to find the cause.

So I want to prevent the case. My request is that the spring throw a exception then shutdown the process of initializing if encounter case like this.

Answer 1

You can @Inject ( @Autowire ) by type, not by id. Read on Autowiring collaborators .

Answer 2

Spring can't have two beans with the same id in one context. So solution is obvious - use different ids.

If you are using xml context it should be :

<bean id="foo" class="what.ever.foo.Class" />

<bean id="bar" class="what.ever.package1.Class" />

If you are using annotations and component scan:

@Component("foo")
@Component("bar")

Annotation based context use different method names:

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