Spring: injecting @RequestBody into @Bean

Question

I want to populate requestScopedBean.userDetails when my controller's update(...) gets executed / before it is executed.

In my spring web project I have java based MyConfiguration extends WebMvcConfigurerAdapter in which I have:

@Bean(name = "requestScopedBean")
@Scope(value = "prototype")
public RequestScopedBean requestScopedBean() {
    return new RequestScopedBean();
}

While in RequestScopedBean.java :

public class RequestScopedBean {

    public @Autowired UserDetails userDetails;

    public void setUserDetails(UserDetails pUserDetails){
        userDetails = pUserDetails;
    }

    @Override
    public String toString() {
        return "" + (userDetails != null) ;
    }
}

And UserDetails.java

public class UserDetails {
    private Long id;
    private String name;

    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }
}

And I have UsersController.java containing :

@RestController
@RequestMapping("/users")
@Scope("request")
public class UsersController {

    @Autowired
    private RequestScopedBean requestScopedBean;

     @RequestMapping(
         value = {"{uid}" }, 
         method = RequestMethod.PUT, 
         produces = MediaType.APPLICATION_JSON_UTF8_VALUE
    )
    public ResponseEntity<?> update(
        @PathVariable String uid,
        @RequestBody UserDetails pUserDetails
    ) throws Exception {

        // LOCATION 1

        // return ResponseEntity;
    }
}

What can I do such that at LOCATION 1, requestScopedBean.userDetails holds variable pUserDetails received in this functions as parameter.

I am looking for some setter-based dependency injection or some factory method based injection though please do advise if some other method is more suitable. Thanks

Answer 1

If you just want to keep the UserDetails object which came from Request, just set the object to requestScopedBean.

@RestController
@RequestMapping("/users")
@Scope("request")
public class UsersController {

    @Autowired
    private RequestScopedBean requestScopedBean;

     @RequestMapping(
         value = {"{uid}" }, 
         method = RequestMethod.PUT, 
         produces = MediaType.APPLICATION_JSON_UTF8_VALUE
    )
    public ResponseEntity<?> update(
        @PathVariable String uid,
        @RequestBody UserDetails pUserDetails
    ) throws Exception {

        requestScopedBean.setUserDetails(pUserDetails);

        // return ResponseEntity;
    }
}

Apart from this, I advice you not to Autowire in your UserDetails object in RequestScopedBean

public class RequestScopedBean {

    public UserDetails userDetails;

    public void setUserDetails(UserDetails pUserDetails){
        userDetails = pUserDetails;
    }

    @Override
    public String toString() {
        return "" + (userDetails != null) ;
    }
}

Let me know, what is the problem you are facing with this approach.