启动时 Spring Boot UnsatisfiedDependencyException

Question

我在 spring 中创建了一个带有 CrudRepository 实现的 MVC API 并接收 UnsatisfiedDependencyException。

我第一次尝试使用@Autowired注解，但不起作用

控制器代码：

    package marcel.pirlog.licenta.userManagement.controllers;

    import marcel.pirlog.licenta.userManagement.services.IAccountService;
    import org.springframework.http.ResponseEntity;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RequestMethod;
    import org.springframework.web.bind.annotation.RestController;

    @RestController("/account")
    public class LoginController {

        IAccountService accountService;

        public LoginController(IAccountService accountService) {
            this.accountService = accountService;
        }

        @RequestMapping(name = "/", method = RequestMethod.GET)
        public ResponseEntity<String> getAll(){
            return ResponseEntity.ok(accountService.findAll().toString());
        }

    }

服务代码：

    package marcel.pirlog.licenta.userManagement.services;

    import marcel.pirlog.licenta.userManagement.entities.AccountEntity;
    import marcel.pirlog.licenta.userManagement.repositorys.IAccountRepository;
    import org.springframework.stereotype.Service;

    import java.util.List;

    @Service
    public class AccountService implements IAccountService {

        private final IAccountRepository accountRepository;

        public AccountService(IAccountRepository accountRepository) {
            this.accountRepository = accountRepository;
        }

        @Override
        public List<AccountEntity> findAll() {
            List<AccountEntity> result = (List<AccountEntity>)accountRepository.findAll();

            return result;
        }
    }

存储库代码：

    @Repository
    public interface IAccountRepository extends CrudRepository<AccountEntity, Long> {
    }

收到UnsatisfiedDependencyException：

org.springframework.beans.factory.UnsatisfiedDependencyException： 使用文件中定义的名称“/帐户”创建 bean 时出错 [C:\Users\parlo\Documents\GitHub\licenta\ProiectLicenta\Server\user-management\target\classes\marcel\pirlog\licenta\userManagement\controllers\LoginController.class]： 通过构造函数参数 0 表示的不满足的依赖关系； 嵌套异常是 org.springframework.beans.factory.UnsatisfiedDependencyException： 创建文件中定义的名称为“accountService”的 bean 时出错 [C:\Users\parlo\Documents\GitHub\licenta\ProiectLicenta\Server\user-management\target\classes\marcel\pirlog\licenta\userManagement\services\AccountService.class]： 通过构造函数参数 0 表示的不满足的依赖关系； 嵌套异常是 org.springframework.beans.factory.BeanCreationException：错误 创建名为“IAccountRepository”的bean：调用init 方法失败；嵌套异常是 java.lang.IllegalArgumentException： 不是托管类型：类 marcel.pirlog.licenta.userManagement.entities.AccountEntity ...

Answer 1

正如 cmets 中提到的，在您的 AccountEntity 上使用 @Entity。

插入

@RestController("/account")
public class LoginController {

试试

@RestController
@RequestMapping("account")
public class LoginController {

Answer 2

向我们展示 AccountEntity 类。是否带有注释@Entity，您是否有来自 Long 类型的 id。应该是这样的：

import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;

@Entity
    public class AccountEntity {

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    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; }
}

Answer 3

尝试添加@EnableJpaRepositories("your.package.name") 并确保你有@ComponentScan("base.package.name") 到SpringInitializer。