我知道这个问题已经被问了很多次,我冒着重复提问的风险(可能是两次、三次或四次),但是提出的解决方案似乎对我不起作用。
我遇到了令人头疼的无法自动装配错误。这是我第一次从头开始设置完整的Spring项目,所以我不太清楚问题出在哪里。
这是我的当前设置:
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> {
}
项目服务:
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();
}
}
项目RestController:
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:
严重: 发送上下文初始化事件到类org.springframework.web.context.ContextLoaderListener的监听器实例时出现异常 org.springframework.beans.factory.BeanCreationException: 创建名为'projectRestController'的bean时注入自动装配依赖项失败;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时注入自动装配依赖项失败;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:未找到类型为[be.italent.repo.ProjectRepo]的合格bean,用于此依赖项:预期至少有1个bean符合此依赖项的自动装配候选项。依赖注释:{@org.springframework.beans.factory.annotation.Autowired(required=true)} at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:292) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1185) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:537) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:475) at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:304) at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:228) at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:300) at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:195) at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:700) at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:760) at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:482) at org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:403) at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:306) at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:106) at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:5068) at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5584) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:147) at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1572) at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1562) at java.util.concurrent.FutureTask.run(FutureTask.java:266) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) at java.lang.Thread.run(Thread.java:745) Caused by: 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时注入自动装配依赖项失败;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:未找到类型为[be.italent.repo.ProjectRepo]的合格bean,用于此依赖项:预期至少有1个bean符合此依赖项的自动装配候选项。依赖注释:{@org.springframework.beans.factory.annotation.Autowired(required=true)} at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:508) at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:87) at org.springframework.beans.factory.annotation.Autowired需要帮助吗?谢谢!
解决方案
将以下内容添加到我的spring-mvc.xml文件中:
<beans
...
jpa http://www.springframework.org/schema/data/jpa/spring-jpa.xsd">
...
<jpa:repositories base-package="be.italent.repo" entity-manager-factory-ref="emf"/>