Java 请求的bean当前正在创建中

我的控制器

@RestController
public class CheckUserDataRestController {
    private final UserSearchService userSearchService;
    @Autowired
    public CheckUserDataRestController(final UserSearchService userSearchService) {
        this.userSearchService = userSearchService;
    }
...
}

初始化bean服务

@Service("userSearchService")
public class UserSearchServiceImpl implements UserSearchService {
    private final UserRepository userRepository;
    private final AuthorizationService authorizationService;
    @Autowired
    public UserSearchServiceImpl(
            @NotNull final UserRepository userRepository,
            @NotNull final AuthorizationService authorizationService
    ) {
        this.userRepository = userRepository;
        this.authorizationService = authorizationService;
    }
...
}

它初始化另一个服务bean

@Service("authorizationService")
public class AuthorizationServiceImpl implements AuthorizationService {
    private final UserSearchService userSearchService;
    @Autowired
    public AuthorizationServiceImpl(final UserSearchService userSearchService) {
        this.userSearchService = userSearchService;
    }
...
}

编译期间引发以下错误：

2018-04-05 02:09:39.024  WARN 1864 --- [           main] ConfigServletWebServerApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.UnsatisfiedDependencyException: 
Error creating bean with name 'checkUserDataRestController' defined in file [C:\Users\Jonatan\Documents\GitHub\REST-Web-Services\web\out\production\classes\com\web\web\controller\CheckUserDataRestController.class]: Unsatisfied dependency expressed through constructor parameter 0; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: 
Error creating bean with name 'userSearchService' defined in file [C:\Users\Jonatan\Documents\GitHub\REST-Web-Services\core\out\production\classes\com\core\jpa\service\UserSearchServiceImpl.class]: Unsatisfied dependency expressed through constructor parameter 1; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: 
Error creating bean with name 'authorizationService' defined in file [C:\Users\Jonatan\Documents\GitHub\REST-Web-Services\core\out\production\classes\com\core\service\impl\AuthorizationServiceImpl.class]: Unsatisfied dependency expressed through constructor parameter 0; nested exception is org.springframework.beans.factory.BeanCurrentlyInCreationException: 
Error creating bean with name 'userSearchService': Requested bean is currently in creation: Is there an unresolvable circular reference?

---

该错误是由以下事实引起的：

UserSearchService

服务在控制器和

AuthorizationService

服务中同时自动连接。如何防止此错误？

问题是

AuthorizationServiceImpl

的构造函数需要连接

UserSearchService

的bean，这意味着将连接

UserSearchServiceImpl

，但是

usersearchserviceinpl

的构造函数需要连接

authorizationserviceinpl

的bean（这意味着将连接

authorizationserviceinpl

）。此依赖关系是循环的，如果没有开发人员的帮助，Spring无法解决此依赖关系：

AuthorizationServiceImpl

→ <代码>用户搜索服务impl→ <代码>授权ServiceImpl

打破这种循环依赖关系的一种方法是通过而不是通过将

UserSearchService

bean注入

authorizationserviceinpl

中。这允许Spring创建

AuthorizationServiceImpl

bean，而无需创建

UserSearchServiceImpl

bean。一旦

AuthorizationServiceImpl

被初始化，就可以初始化

UserSearchServiceImpl

bean。初始化

usersearchserviceinpl

后，可以使用其setter将其连接到

authorizationserviceinpl

。这将相关性减少到以下方面：

@Service("authorizationService")
public class AuthorizationServiceImpl implements AuthorizationService {
    private UserSearchService userSearchService;

    public AuthorizationServiceImpl() {}

    @Autowired
    public void setUserSearchService(UserSearchService userSearchService) {
        this.userSearchService = userSearchService;
    }

    ...

}

@Service("userSearchService")
public class UserSearchServiceImpl implements UserSearchService {

    private final UserRepository userRepository;
    private AuthorizationService authorizationService;

    @Autowired
    public UserSearchServiceImpl(@NotNull final UserRepository userRepository) {
        this.userRepository = userRepository;
    }

    @Autowired
    public void setAuthorizationService(AuthorizationService authorizationService) {
        this.authorizationService = authorizationService;
    }

    ...
}

UserSearchServiceImpl

→ <代码>授权ServiceImpl

为此，请将

authorizationserviceinpl

更改为以下内容：

@Service("authorizationService")
public class AuthorizationServiceImpl implements AuthorizationService {
    private UserSearchService userSearchService;

    public AuthorizationServiceImpl() {}

    @Autowired
    public void setUserSearchService(UserSearchService userSearchService) {
        this.userSearchService = userSearchService;
    }

    ...

}

@Service("userSearchService")
public class UserSearchServiceImpl implements UserSearchService {

    private final UserRepository userRepository;
    private AuthorizationService authorizationService;

    @Autowired
    public UserSearchServiceImpl(@NotNull final UserRepository userRepository) {
        this.userRepository = userRepository;
    }

    @Autowired
    public void setAuthorizationService(AuthorizationService authorizationService) {
        this.authorizationService = authorizationService;
    }

    ...
}

和

usersearchserviceinpl

到以下内容：

@Service("authorizationService")
public class AuthorizationServiceImpl implements AuthorizationService {
    private UserSearchService userSearchService;

    public AuthorizationServiceImpl() {}

    @Autowired
    public void setUserSearchService(UserSearchService userSearchService) {
        this.userSearchService = userSearchService;
    }

    ...

}

@Service("userSearchService")
public class UserSearchServiceImpl implements UserSearchService {

    private final UserRepository userRepository;
    private AuthorizationService authorizationService;

    @Autowired
    public UserSearchServiceImpl(@NotNull final UserRepository userRepository) {
        this.userRepository = userRepository;
    }

    @Autowired
    public void setAuthorizationService(AuthorizationService authorizationService) {
        this.authorizationService = authorizationService;
    }

    ...
}

---

需要注意的是，这项技术要求

userSearchService

和

authorizationService

字段是可变的（删除了

final

限定符）。

我认为您编写的内容有所帮助，但没有。今天我检查并抛出了错误@Super_Koks，明白了。也可以使用

UserSearchService

尝试setter注入（这样两者都有setter注入），看看这是否解决了问题。即通过setter注入将

AuthorizationService

注入

usersearchserviceinpl

。