java - UnsatisfiedDependencyException:创建名称为'procjectController'的bean时出错:通过字段表示的不满足的依赖关系

我正在使用Spring JAP建立简单的ManyToOne关系。我得到UnsatisfiedDependencyException错误，bean名称通过字段表示不满意的依赖关系


  UnsatisfiedDependencyException：创建名称为“ procjectController”的bean时出错：不满意


这是我的档案。

project.java

package com.ganesh.dto;

import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.ManyToOne;

import com.fasterxml.jackson.annotation.JsonIgnore;


@Entity
public class Project {

    @Id
    private int projectId;
    private String projectName;

    //Relation establish
    @ManyToOne(
            fetch = FetchType.LAZY,
            optional = false
            )
    @JoinColumn(
            name = "employee_id",
            nullable = false
            )
    @JsonIgnore
    private Employee employee;


    public Project() {

    }

    public Project(int projectId, String projectName, int eId) {
        super();
        this.projectId = projectId;
        this.projectName = projectName;
        //Adding employee
        this.employee = new Employee(eId,"","");
    }

    public int getProjectId() {
        return projectId;
    }

    public void setProjectId(int projectId) {
        this.projectId = projectId;
    }

    public String getProjectName() {
        return projectName;
    }

    public void setProjectName(String projectName) {
        this.projectName = projectName;
    }

    //Adding getter and setters Employee reference
        public Employee getEmployee() {
            return employee;
        }

        public void setEmployee(Employee employee) {
            this.employee = employee;
        }

}

ProjectDao.java

package com.ganesh.dao;

import java.util.List;

import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.stereotype.Repository;

import com.ganesh.dto.Project;

@Repository
public interface ProjectDao extends JpaRepository<Project, Integer> {

    List<Project> findEmployeeById(int eId);

}

ImpProjectService.java

package com.ganesh.service;

import java.util.List;

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

import com.ganesh.dao.*;
import com.ganesh.dto.Project;

@Service
public class ImpProjectService implements ProjectService {

    @Autowired
    private ProjectDao projectDao;


    @Override
    public List<Project> getProjectList(int eId) {
        System.out.println("in Dao class employee id"+ eId);
        return projectDao.findEmployeeById(eId);
    }

    @Override
    public Project getProjectById(int id) {
        return projectDao.getOne(id);
    }

    @Override
    public void addProject(Project project) {
        projectDao.save(project);

    }

    @Override
    public void updateProject(Project project) {
        projectDao.save(project);

    }

    @Override
    public void deleteProjectById(int id) {
        projectDao.deleteById(id);
    }

    @Override
    public List<Project> getAllProject() {
        return projectDao.findAll();
    }

}

ProcjectController.java

package com.ganesh.controller;

import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;

import com.ganesh.dto.*;
import com.ganesh.service.*;

@RestController
public class ProcjectController {

    @Autowired
    private ImpProjectService projectService;


    @RequestMapping("/projects")
    public List<Project> getProjectList(){
       return projectService.getAllProject();
    }


    @RequestMapping("/employees/{eId}/projects")
    public List<Project> getAllProjects(@PathVariable int eId){
        System.out.println("In Project Controller");
        List<Project> projList = projectService.getProjectList(eId);
        System.out.println(projList);
        return projList;
    }

    @RequestMapping("/employees/{eId}/projects/{id}")
    public Project getProjectById(@PathVariable int id) {
        return projectService.getProjectById(id);
    }

    @RequestMapping(method = RequestMethod.POST, value="/employees/{eId}/projects")
    public void addProject(@RequestBody Project project, @PathVariable int eId) {
        project.setEmployee(new Employee(eId,"",""));
        projectService.addProject(project);
    }

    @RequestMapping(method = RequestMethod.PUT, value="/employees/{eId}/projects/{id}")
    public void updateProject(@RequestBody Project project, @PathVariable int eId) {
        project.setEmployee(new Employee(eId,"",""));
        projectService.updateProject(project);
    }

    @RequestMapping(method = RequestMethod.DELETE, value="/projects/{id}")
    public void deleteProjecstById(@PathVariable int id) {
        projectService.deleteProjectById(id);
    }
}

最佳答案

注意：此答案基于数据不足，因为堆栈跟踪不可用。使用正确且完整的堆栈跟踪，我们也许可以提供更精确的答案。

回答：
在您的Dao课堂上看起来像是一个问题。

你写

@Repository
public interface ProjectDao extends JpaRepository<Project, Integer> {

    List<Project> findEmployeeById(int eId);

}

这意味着您正在创建类型为Project的存储库，并尝试将查询作为findEmployeeById触发。它应该是findByEmployee（接受Employee作为参数），或者根本不存在。因为查询语法和Template参数不匹配。因此，Spring将无法为其初始化查询处理程序。

如果可以满足您的目的，请尝试如下进行更改。
    @资料库
    公共接口ProjectDao扩展了JpaRepository {

    List<Project> findAllByEmployee(Employee emp);

}

请检查相同，然后更正。如果仍然无法使用，请发布完整的堆栈跟踪，我们会为您提供帮助。