How to inject request scoped bean?

Question

I want to inject my request scoped bean to my other bean.

@Component
@Scope(value = WebApplicationContext.SCOPE_REQUEST)
public class UiCtx {

    @Autowired(required = true)
    private ApplicationContext ctx;

    @Autowired(required = true)
    private ServletWebRequest req;

    // [...]
}

I try to inject this bean to a JPage bean:

@Component
@Scope("prototype")
public class Jpage extends AbstractUiComponent {
   // [...]
}

public abstract class AbstractUiComponent  {

    @Autowired(required = true)
    private UiCtx ctx;
    // [...]
}

In the controller I have tried:

@RestController
class GreetingController {

    @RequestMapping("/jpage")
    void jpage(HttpServletRequest request, HttpServletResponse response,
            @Autowired @Qualifier("jpage") AbstractUiComponent jpage) throws IOException {
        WritePage.writeWebPage(request, response, jpage);
       }
    }
}

I got:

Failed to instantiate [pl.mirage.components.AbstractUiComponent]: Is it an abstract class?; nested exception is java.lang.InstantiationException

Another attempt. It doesn't work because @RestController is a singleton - you can't inject request scope into singleton scope:

@RestController
class GreetingController {

    @Autowired
    @Qualifier("jpage")
    AbstractUiComponent jpage;

    @RequestMapping("/jpage")
    void jpage(HttpServletRequest request, HttpServletResponse response) throws IOException {
        WritePage.writeWebPage(request, response, jpage);
    }
}

I got:

org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'greetingController': Unsatisfied dependency expressed through field 'jpage'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'jpage': Unsatisfied dependency expressed through field 'ctx'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'uiCtx': Scope 'request' is not active for the current thread; consider defining a scoped proxy for this bean if you intend to refer to it from a singleton; nested exception is java.lang.IllegalStateException: No thread-bound request found: Are you referring to request attributes outside of an actual web request, or processing a request outside of the originally receiving thread? If you are actually operating within a web request and still receive this message, your code is probably running outside of DispatcherServlet/DispatcherPortlet: In this case, use RequestContextListener or RequestContextFilter to expose the current request.

It is possible to fix this by annotating UICtx or JPage as @Scope(value = "[..]", proxyMode = ScopedProxyMode.TARGET_CLASS).

It only works when JPage is injected as a controller field. It doesn't work when JPage is injected as a method parameter.

How do I suppose to inject a request scoped bean?

Possible duplicate of [Inject request scoped bean into another bean](http://stackoverflow.com/questions/34090750/inject-request-scoped-bean-into-another-bean) — Tom, Apr 17 '17 at 09:30

score 0 · Answer 1 · answered Jan 05 '22 at 20:27

Follow the advice (which I emphasized in bold) given in error-message:

BeanCreationException: Error creating bean with name 'uiCtx': Scope 'request' is not active for the current thread; consider defining a scoped proxy for this bean if you intend to refer to it from a singleton;

You need the proxyMode to boot the app with UICtx dependency injected, e.g. define

@Component
@Scope(value = WebApplicationContext.SCOPE_REQUEST, proxyMode = ScopedProxyMode.TARGET_CLASS)
public class UiCtx {
   // omitted class body
}

or shorthand @RequestScope. See Baeldung Tutorial or duplicate linked in Tom's comment:

Inject request scoped bean into another bean

How to inject request scoped bean?

1 Answers1