错误运行Spring Boot（通过字段表示的不满足的依赖关系）[重复]

Posted 2023-02-26

【中文标题】错误运行Spring Boot（通过字段表示的不满足的依赖关系）[重复]

【英文标题】：Error Run Spring Boot (Unsatisfied dependency expressed through field) [duplicate]

【发布时间】：2020-02-13 20:40:36

【问题描述】：

我正在观看一堂课，我所做的一切都完全像一堂课，但编译时出错了。 遵循代码和类

2019-10-16 22:49:39.528 信息 7668 --- [主要] ConditionEvaluationReportLoggingListener：

启动 ApplicationContext 时出错。显示条件报告 在启用“调试”的情况下重新运行您的应用程序。 2019-10-16 22:49:39.544 错误 7668 --- [主] os.boot.SpringApplication : 应用程序运行失败

org.springframework.beans.factory.UnsatisfiedDependencyException： 创建名为“pessoaController”的 bean 时出错：不满意 通过字段“服务”表达的依赖关系；嵌套异常是 org.springframework.beans.factory.UnsatisfiedDependencyException： 创建名为“pessoaServiceImp”的 bean 时出错：不满意 通过字段“存储库”表达的依赖关系；嵌套异常是 org.springframework.beans.factory.BeanCreationException：错误 创建名为“pessoaRepository”的bean：调用init方法 失败的;嵌套异常是 java.lang.IllegalArgumentException: Failed 为方法 public abstract com.mydream.mydream.Pessoa 创建查询 com.mydream.mydream.PessoaRepository.findOne(java.lang.Long)！不 找到类型 Pessoa 的属性 findOne！在 org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:598) ~[spring-beans-5.1.10.RELEASE.jar:5.1.10.RELEASE] 在 org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:90) ~[spring-beans-5.1.10.RELEASE.jar:5.1.10.RELEASE] 在 org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessProperties(AutowiredAnnotationBeanPostProcessor.java:376) ~[spring-beans-5.1.10.RELEASE.jar:5.1.10.RELEASE] 在 org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1411) ~[spring-beans-5.1.10.RELEASE.jar:5.1.10.RELEASE] 在 org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:592) ~[spring-beans-5.1.10.RELEASE.jar:5.1.10.RELEASE] 在 org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:515) ~[spring-beans-5.1.10.RELEASE.jar:5.1.10.RELEASE] 在 org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:320)

Pessoa.java

package com.mydream.mydream;

import javax.persistence.*;

@Entity(name="PESSOA")
public class Pessoa 
    @Id
    @Column
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;

    private String nome;

    private String apelido;

    public Long getId() 
        return id;
    

    public void setId(final Long id) 
        this.id = id;
    

    public String getNome() 
        return nome;
    

    public void setNome(final String nome) 
        this.nome = nome;
    

    public String getApelido() 
        return apelido;
    

    public void setApelido(String apelido) 
        this.apelido = apelido;
    

PessoaService.java

package com.mydream.mydream;

import java.util.List;

public interface PessoaService 
    List<Pessoa>listar();

    Pessoa listarId(Long id);

    Pessoa add(Pessoa p);
    Pessoa edit(Pessoa p);
    Pessoa delete(Long id);

PessoaServiceImp.java

package com.mydream.mydream;

import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service
public class PessoaServiceImp implements PessoaService 

    @Autowired
    private PessoaRepository repository;

    @Override
    public List<Pessoa> listar() 
        return repository.findAll();
    

    @Override
    public Pessoa listarId(Long id) 
        // TODO Auto-generated method stub
        return null;
    

    @Override
    public Pessoa add(Pessoa p) 
        // TODO Auto-generated method stub
        return null;
    

    @Override
    public Pessoa edit(Pessoa p) 
        // TODO Auto-generated method stub
        return null;
    

    @Override
    public Pessoa delete(Long id) 
        // TODO Auto-generated method stub
        return null;
    

PessoaRepository.java

package com.mydream.mydream;

import com.mydream.mydream.Pessoa;
import java.util.List;
import org.springframework.data.repository.Repository;

public interface PessoaRepository extends Repository<Pessoa, Long>
    List<Pessoa> findAll();

    Pessoa findOne(Long id);
    Pessoa save(Pessoa p);
    void delete(Pessoa p);

PessoaController.java

package com.mydream.mydream;

import com.mydream.mydream.Pessoa;
import com.mydream.mydream.PessoaService;
import java.util.List;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.CrossOrigin;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@CrossOrigin(origins = "http://localhost:4200/", maxAge = 3600)
@RestController
@RequestMapping(path= "/pessoas")
public class PessoaController 

    @Autowired
    PessoaService service;

    @GetMapping
    public List<Pessoa>listar()
        return service.listar();
    

我已经做了我在其他帖子中所做的，但我没有解决办法

【问题讨论】：

正如您在link to duplicate（问题上方）中看到的，将方法重命名为findById，并将返回类型更改为Optional<Pessoa>。 --- 或者使用旧版本的 Spring Data (

【参考方案1】：

PessoaService 中缺少@Repository 注释

【讨论】：

在 PessoaService 中？出现错误感谢您的帮助！