In our project, we use Spring request scoped beans. Now we've a requirement to support async requests and request scoped beans don't work for child threads. I'm aware of RequestContextFilter and it's "support" for async but it appears that RequestContextFilter
expects the main thread to wait for the child threads to finish, which isn't the case for us. Our main thread immediately returns after spawning new threads using @Async
annotation and DispatcherServlet
clears out the RequestContextHolder
. Thus when the child threads get to the point where they need a request scoped bean, @Autowired
fails.
I'm also aware of SimpleThreadScope but it doesn't clean up thread-local attributes and in a thread-pooling situation, is not only dangerous to use but downright useless.
What I need is a custom scope. So far, I've found 3 useful examples but all of them fall short in that the beans they instantiate as part of the custom scope are plain POJOs without any dependencies. Needless to say that's non-existent in a real life application. Can anyone suggest a way to instantiate custom scoped beans that have @Autowired
dependencies on beans from other scopes?
What I found so far:
https://github.com/spring-by-example/spring-by-example/tree/master/modules/sbe-thread-scope/src/main/java/org/springbyexample/bean/scope/thread
https://github.com/billkoch/spring-async-mdc
Spring Bean Custom Scope JMS