注入自动装配的依赖项失败，无法自动装配字段

我知道这个问题已经被问了很多，我冒了一个双重（或三重或四重）的话题，但建议的解决方案似乎对我不起作用 .

我遇到了很多可怕的无法自动发送错误的问题 . 第一次从头开始设置一个完整的Spring项目，所以我真的不知道问题是什么 .

这是我目前的设置：ProjectRepo：

package be.italent.repo;

import be.italent.model.Project;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.stereotype.Repository;

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

}

ProjectService：

package be.italent.services;

import be.italent.model.Project;
import be.italent.repo.ProjectRepo;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;

@Service
public class ProjectService {

    @Autowired
    private ProjectRepo projectRepo;

    public List<Project> getAllProjects() {
        return projectRepo.findAll();
    }
}

ProjectRestController：

package be.italent.controllers;

import java.util.ArrayList;
import be.italent.services.ProjectService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;
import be.italent.model.Project;

@RestController
@RequestMapping("/projects")
public class ProjectRestController {

    @Autowired
    private ProjectService projectService;

    @RequestMapping(method = RequestMethod.GET, produces="application/json")
    public ArrayList<Project> getProjects(){
        ArrayList<Project> c = (ArrayList<Project>) projectService.getAllProjects();

        return c;
    }
}

spring mvc.xml

...
<context:component-scan base-package="be.italent"></context:component-scan>
...

错误：

SEVERE：异常将上下文初始化事件发送到类的监听器实例org.springframework.web.context.ContextLoaderListener org.springframework.beans.factory.BeanCreationException：创建名为'projectRestController'的bean时出错：注入自动连接的依赖项失败;嵌套异常是org.springframework.beans.factory.BeanCreationException：无法自动装配字段：private be.italent.services.ProjectService be.italent.controllers.ProjectRestController.projectService;嵌套异常是org.springframework.beans.factory.BeanCreationException：创建名为'projectService'的bean时出错：注入自动连接的依赖项失败;嵌套异常是org.springframework.beans.factory.BeanCreationException：无法自动装配字段：private be.italent.repo.ProjectRepo be.italent.services.ProjectService.projectRepo;嵌套异常是org.springframework.beans.factory.NoSuchBeanDefinitionException：没有为依赖项找到类型为[be.italent.repo.ProjectRepo]的限定bean：期望至少有一个bean可以作为此依赖项的autowire候选者 . 依赖注释：{org.springframework.beans.factory.annotation.Autowired（required = true）}位于org.springframework.beans的org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues（AutowiredAnnotationBeanPostProcessor.java:292） . factory.support.AbstractAutowireCapableBeanFactory.populateBean（AbstractAutowireCapableBeanFactory.java:1185）在org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean（AbstractAutowireCapableBeanFactory.java:537）在org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean（位于org.springframework.beans.factory.support.AbstractBeanFactory $ 1.getObject（AbstractBeanFactory.java:304）的org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton（DefaultSingletonBeanRegistry.java:228）处的AbstractAutowireCapableBeanFactory.java:475） org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean（AbstractBeanFactory.java ：300）在org.springframework的org.springframework.beans.factory.support.AbstractBeanFactory.getBean（AbstractBeanFactory.java:195）org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons（DefaultListableBeanFactory.java:700） . 在org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext（ContextLoader.java）的org.springframework.context.support.AbstractApplicationContext.refresh（AbstractApplicationContext.java:482）上的context.support.AbstractApplicationContext.finishBeanFactoryInitialization（AbstractApplicationContext.java:760）： 403）org.springframework.web.context.ContextLoader.initWebApplicationContext（ContextLoader.java:306）org.apringframework.web.context.ContextLoaderListener.contextInitialized（ContextLoaderListener.java:106）at org.apache.catalina.core.StandardContext .listenerStart（StandardContext.java:5068）位于org.apache.catali的org.apache.catalina.core.StandardContext.startInternal（StandardContext.java:5584） na.util.LifecycleBase.start（LifecycleBase.java:147）位于org.apache.catalina.core.ContainerBase $ StartChild.call（ContainerBase.java:1572）org.apache.catalina.core.ContainerBase $ StartChild.call（ ContainerBase.java:1562）java.util.conc当前的java.util.concurrent.FutureTask.run（FutureTask.java:266）java.util.concurrent.ThreadPoolExecutor.runWorker（ThreadPoolExecutor.java:1142）java.util.concurrent.ThreadPoolExecutor $ Worker .run（ThreadPoolExecutor.java:617）at java.lang.Thread.run（Thread.java:745）引起：org.springframework.beans.factory.BeanCreationException：无法自动装配字段：private be.italent.services.ProjectService be.italent.controllers.ProjectRestController.projectService;嵌套异常是org.springframework.beans.factory.BeanCreationException：创建名为'projectService'的bean时出错：注入自动连接的依赖项失败;嵌套异常是org.springframework.beans.factory.BeanCreationException：无法自动装配字段：private be.italent.repo.ProjectRepo be.italent.services.ProjectService.projectRepo;嵌套异常是org.springframework.beans.factory.NoSuchBeanDefinitionException：没有为依赖项找到类型为[be.italent.repo.ProjectRepo]的限定bean：期望至少有一个bean可以作为此依赖项的autowire候选者 . 依赖注释：org.springframework.beans.factory上的org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor $ AutowiredFieldElement.inject（AutowiredAnnotationBeanPostProcessor.java:508）中的{@ org.springframework.beans.factory.annotation.Autowired（required = true）} .annotation.InjectionMetadata.inject（InjectionMetadata.java:87）at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues（AutowiredAnnotationBeanPostProcessor.java:289）... 22更多引起：org.springframework.beans.factory . BeanCreationException：创建名为'projectService'的bean时出错：注入自动连接的依赖项失败;嵌套异常是org.springframework.beans.factory.BeanCreationException：无法自动装配字段：private be.italent.repo.ProjectRepo be.italent.services.ProjectService.projectRepo;嵌套异常是org.springframework.beans.factory.NoSuchBeanDefinitionException：没有为依赖项找到类型为[be.italent.repo.ProjectRepo]的限定bean：期望至少有一个bean可以作为此依赖项的autowire候选者 . 依赖注释：{org.springframework.beans.factory.annotation.Autowired（required = true）}位于org.springframework.beans的org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues（AutowiredAnnotationBeanPostProcessor.java:292） . 在org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean的org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean（AbstractAutowireCapableBeanFactory.java:537）上的factory.support.AbstractAutowireCapableBeanFactory.populateBean（AbstractAutowireCapableBeanFactory.java:1185）位于org.springframework.beans.factory.support.AbstractBeanFactory $ 1.getObject（AbstractBeanFactory.java:304）的org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton（DefaultSingletonBeanRegistry.java:228）处的AbstractAutowireCapableBeanFactory.java:475） org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean（AbstractBeanFactory.java ：300）在org.springframework的org.springframework.beans.factory.support.AbstractBeanFactory.getBean（AbstractBeanFactory.java:195）org.springframework.beans.factory.support.DefaultListableBeanFactory.findAutowireCandidates（DefaultListableBeanFactory.java:1014） . bean.factory.support.DefaultListableBeanFactory.doResolveDependency（DefaultListableBeanFactory.java:957）位于org.springframework.beans.factory.factory.ApreowiredAnnotationBeanPostProcessor上的org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency（DefaultListableBeanFactory.java:855） AutowiredFieldElement.inject（AutowiredAnnotationBeanPostProcessor.java:480）... 24更多引起：org.springframework.beans.factory.BeanCreationException：无法自动装配字段：private be.italent.repo.ProjectRepo be.italent.services.ProjectService.projectRepo ;嵌套异常是org.springframework.beans.factory.NoSuchBeanDefinitionException：没有为依赖项找到类型为[be.italent.repo.ProjectRepo]的限定bean：期望至少有一个bean可以作为此依赖项的autowire候选者 . 依赖注释：{org.springframework.beans.factory.annotation.Autowired（required = true）}在org.springframework的org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor $ AutowiredFieldElement.inject（AutowiredAnnotationBeanPostProcessor.java:508） . beans.factory.annotation.InjectionMetadata.inject（InjectionMetadata.java:87）at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues（AutowiredAnnotationBeanPostProcessor.java:289）... 35更多引起：org.springframework.beans .factory.NoSuchBeanDefinitionException：没有为依赖项找到[be.italent.repo.ProjectRepo]类型的限定bean：期望至少有一个bean可以作为此依赖项的autowire候选者 . 依赖注释：{@ org.springframework.beans.factory.annotation.Autowired（required = true）}位于org.springframework.beans的org.springframework.beans.factory.support.DefaultListableBeanFactory.raiseNoSuchBeanDefinitionException（DefaultListableBeanFactory.java:1100） . or.s.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency（DefaultListableBeanFactory.java:855）中的factory.support.DefaultListableBeanFactory.doResolveDependency（DefaultListableBeanFactory.java:960）位于org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor $ AutowiredFieldElement . inject（AutowiredAnnotationBeanPostProcessor.java:480）......还有37个

有帮助吗？谢谢！

Solution

将此添加到我的spring-mvc.xml：

<beans
...
jpa http://www.springframework.org/schema/data/jpa/spring-jpa.xsd">

...

<jpa:repositories base-package="be.italent.repo" entity-manager-factory-ref="emf"/>