spring autowired aop circular dependency

问题

I'm using java config with @ComponentScanin order to initialize my beans and @EnableAspectJAutoProxy(proxyTargetClass=true)to use cglib proxies.

In this project we have a lots of generated services autowired between them using @Autowired. It works pretty well.

But, for some of these services I've added @Async (I've also added @EnableAsync(proxyTargetClass = true)on my @Configurationclass).

After that, I'm getting:

Caused by: org.springframework.beans.factory.BeanCurrentlyInCreationException: Error creating bean with name 'ConversationUserLocalService': Bean with name 'ConversationUserLocalService' has been injected into other beans [ConversationUserHistoryLocalService] i
n its raw version as part of a circular reference, but has eventually been wrapped. This means that said other beans do not use the final version of the bean. This is often the result of over-eager type matching - consider using 'getBeanNamesOfType' with the 'a
llowEagerInit' flag turned off, for example.

I guess this is because Spring is injecting the service with @Asyncmethod BEFORE AOP creates the proxy. This could be the problem? How I should fix it?

In order to try to clarify my problem, let's say I have:

@Service A,B & C

A has autowired B & C B has autowired A & C C has autowired A & B

C has a method marked as @Async.

When Spring initialize applicationContext, it tries to initialize A, but needs B & C, so it initializes them. But after all, AOP tries to make a proxy of C (because @Async) and then it detects that autowired C into B and A is not the same as proxy of C so it fails.

I hope this can explain a little more what is happening.

回答1:

AsyncConfigurer configuration classes get initialized early in the application context bootstrap. If you need any dependencies on other beans there, make sure to declare them 'lazy' as far as possible in order to let them go through other post-processors as well.

Reference JavaDoc: https://docs.spring.io/spring-framework/docs/current/javadoc-api/org/springframework/scheduling/annotation/EnableAsync.html

回答2:

Finally I sorted it out using @Lazyon services (with methods annotated with @Async), and also, where they were autowired. This way I guess Spring only initialize and autowires those services when they're required instead of on application context initialization.

回答3:

I managed to fix a similar issue by adding @Qualifier together with @Autowire, for example:

@Autowired
@Qualifier("publisher")
private Publisher publisher;

来源：https://stackoverflow.com/questions/28985144/spring-autowired-aop-circular-dependency