java - Spring 3+如何 Autowiring 相互使用的bean？

Question

比如我有

@Service
public class UserSerice {
  @Autowired
  private HouseService houseService;
}

和

@Service
public class HouseService {
  @Autowired
  private UserSerice userService;
}

Spring 将如何 Autowiring 它？以这种方式配置 bean 是一种好的做法吗？

Answer 1

Circular dependencies (spring-framework-reference):

For example: Class A requires an instance of class B through constructor injection, and class B requires an instance of class A through constructor injection...throws a BeanCurrentlyInCreationException.

it is not recommended... One possible solution is to edit the source code of some classes to be configured by setters rather than constructors...

加上:

我以 setter 方式调试了循环依赖。 序列似乎是:

-> 开始创建bean A

-> 开始创建bean B

-> 将A注入(inject)B，虽然A从Spring生命周期的角度来看并没有完全创建

->Bean B 创建完成

-> 将 bean B 注入(inject) A

-> Bean A 创建