关于spring mvc 注解找不到bean 的问题

[潇湘暮雨]

以前没弄过spring的东东，最近有需要用spring弄报表相关的东东。这不，报表功能还没添加，各种配置问题，各种奇奇怪怪的问题出现了，“新手定理”被完美诠释了。
一直报错，不懂什么意思。明明已经写了自动注入和组件标记。
错误信息如下：
org.springframework.beans.factory.NoSuchBeanDefinitionException: No matching bean of type [com.cn.wuxiong.spring.school.dao.StudentDao] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}


对应的java实体类如下：

package com.cn.wuxiong.spring.school.domain;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.NamedQueries;
import javax.persistence.NamedQuery;
import javax.persistence.Table;

@Entity
@Table(name = "aastudent", catalog = "itsm")
@NamedQueries({
		@NamedQuery(name = "findAllStudents", query = "SELECT s FROM Student s"),
		@NamedQuery(name = "findStudentById", query = "SELECT s FROM Student s where s.id=?") })
public class Student {

	private Long id;
	private String stuNo;
	private String name;
	private Integer age;
	private String sex;

	public Student() {
	};

	public Student(Long id, String stuNo, String name, Integer age, String sex) {
		this.id = id;
		this.stuNo = stuNo;
		this.name = name;
		this.age = age;
		this.sex = sex;
	}

	@Id
	@GeneratedValue(strategy = GenerationType.IDENTITY)
	@Column(name = "ID", nullable = false)
	public Long getId() {
		return id;
	}

	public void setId(Long id) {
		this.id = id;
	}

	@Column(name = "stuNo", nullable = false)
	public String getStuNo() {
		return stuNo;
	}

	public void setStuNo(String stuNo) {
		this.stuNo = stuNo;
	}

	@Column(name = "name", nullable = false)
	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	@Column(name = "age", nullable = false)
	public Integer getAge() {
		return age;
	}

	public void setAge(Integer age) {
		this.age = age;
	}

	@Column(name = "sex", nullable = false)
	public String getSex() {
		return sex;
	}

	public void setSex(String sex) {
		this.sex = sex;
	}

}

============================================================================
然后对应的dao，这个类里面没什么具体的方法，只是个接口，方法都在上一级接口中：

package com.cn.wuxiong.spring.school.dao;

import org.springframework.data.repository.PagingAndSortingRepository;

import com.cn.wuxiong.spring.school.domain.Student;

public interface StudentDao extends PagingAndSortingRepository<Student, Long>,StudentDaoEx {//
}

========
对应的StudentDaoEx 接口：

package com.cn.wuxiong.spring.school.dao;

import org.springframework.stereotype.Repository;

import com.cn.wuxiong.spring.school.domain.Student;

@Repository
public interface StudentDaoEx {
	public int getCount();
	public void persist(Student st);
	public void testFunc();
}

===========
对应的上一个接口的实现类如下，为了测试，故而写了相当少的测试方法：

package com.cn.wuxiong.spring.school.dao;

import org.springframework.stereotype.Repository;

import com.cn.wuxiong.spring.school.domain.Student;

@Repository
public class StudentDaoImpl implements StudentDaoEx {

	@Override
	public void testFunc(){
		System.out.println("#############Test DAO");
	}
	
	public void persist(Student st){
		System.out.println(st);
	}
	
	public int getCount(){
		System.out.println("数量为：3");
		return 3;
	}
}

=========================================================================
而后对应的service如下：

package com.cn.wuxiong.spring.school.service;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.transaction.annotation.Transactional;

import com.cn.wuxiong.spring.school.dao.StudentDao;

@org.springframework.stereotype.Service
@Transactional
public class SchoolService {
	@Autowired
	private StudentDao dao;

	public void testService() {
		// dao.testFunc();
		System.out.println("###########################Test service");
	}

}

==========================================================
对应的controller为：

package com.cn.wuxiong.spring.school.controller;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;

import com.cn.wuxiong.spring.school.service.SchoolService;

@Controller
@RequestMapping(value = "/itsm/school")
public class SchoolCtrl {
	@Autowired
	private SchoolService schoolService;

	@RequestMapping(value="/student.do", method = RequestMethod.GET)
	public String pagingList() {
		schoolService.testService();
		return "school/studentManagement";
	}

	// 新建
	@RequestMapping(value = "/create", method = RequestMethod.GET)
	public String createPage(Model model) {
		model.addAttribute("action_type", "create");
		return "school/add_update_student";
	}

}

[zuxianghuang]

@Autowired,要有一个确定的类型，比如你在控制层注入SchoolService 用Autowired是可以的 因为SchoolService 就是一个确定的类。 但是你的StudentDaoImpl ，的实现，是实现了，几个接口，这时用Autowired是不可以的。 @Autowired private StudentDao dao;这里是StudentDao 不是一个确定的类， 要使用@Resource @Resource private StudentDao dao;这样

[潇湘暮雨]

spring 相关的 xml文件如下：

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
	xmlns:context="http://www.springframework.org/schema/context"
	xmlns:mvc="http://www.springframework.org/schema/mvc"

	xsi:schemaLocation="http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd
		http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.2.xsd
		http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.2.xsd"
	default-lazy-init="true">

	<context:annotation-config />

	<!-- 扫描组件路径 -->
	<context:component-scan base-package="com.cn.wuxiong.spring.*" />

	<!-- 启动Spring MVC的注解功能，完成请求和注解POJO的映射 -->
	<bean
		class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter" />

	<!-- 对模型视图名称的解析，即在模型视图名称添加前后缀 -->
	<bean
		class="org.springframework.web.servlet.view.InternalResourceViewResolver">
		<property name="prefix" value="/views/" />
		<property name="suffix" value=".jsp" />
	</bean>

	<bean id="multipartResolver"
		class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
		<property name="defaultEncoding" value="utf-8"></property>
	</bean>

	<!-- 异常跳转页面 -->
	<bean
		class="org.springframework.web.servlet.handler.SimpleMappingExceptionResolver">
		<property name="exceptionMappings">
			<props>
				<prop key="java.lang.Throwable">error/500</prop>
			</props>
		</property>
	</bean>

</beans>  

[潇湘暮雨]

引用 1 楼 ZuxiangHuang 的回复:

@Autowired,要有一个确定的类型，比如你在控制层注入SchoolService 用Autowired是可以的 因为SchoolService 就是一个确定的类。 但是你的StudentDaoImpl ，的实现，是实现了，几个接口，这时用Autowired是不可以的。 @Autowired private StudentDao dao;这里是StudentDao 不是一个确定的类， 要使用@Resource @Resource private StudentDao dao;这样

还是没效果，而且我看到其他类似的接口的地方直接用的 @Autowired，而不是@Resource。

[oh_Maxy]

<!-- 扫描组件路径 --> <context:component-scan base-package="com.cn.wuxiong.spring" /> 这样呢？ 还有，启动的时候有没有报错？

[潇湘暮雨]

引用 4 楼 oh_Maxy 的回复:

<!-- 扫描组件路径 --> <context:component-scan base-package="com.cn.wuxiong.spring" /> 这样呢？ 还有，启动的时候有没有报错？

就是在启动的时候报错的。改成 <context:component-scan base-package="com.cn.wuxiong.spring" /> 报一样的错误。

[oh_Maxy]

引用 5 楼 wxwinnie0903 的回复:

[quote=引用 4 楼 oh_Maxy 的回复:] <!-- 扫描组件路径 --> <context:component-scan base-package="com.cn.wuxiong.spring" /> 这样呢？ 还有，启动的时候有没有报错？

就是在启动的时候报错的。改成 <context:component-scan base-package="com.cn.wuxiong.spring" /> 报一样的错误。[/quote] 我的意思是，把报错信息贴出来看看吧~ 另外，配置文件要注意路径问题。你的配置文件放在什么目录下的？

[潇湘暮雨]

引用 6 楼 oh_Maxy 的回复:

[quote=引用 5 楼 wxwinnie0903 的回复:] [quote=引用 4 楼 oh_Maxy 的回复:] <!-- 扫描组件路径 --> <context:component-scan base-package="com.cn.wuxiong.spring" /> 这样呢？ 还有，启动的时候有没有报错？

就是在启动的时候报错的。改成 <context:component-scan base-package="com.cn.wuxiong.spring" /> 报一样的错误。[/quote] 我的意思是，把报错信息贴出来看看吧~ 另外，配置文件要注意路径问题。你的配置文件放在什么目录下的？[/quote] ######################################################################### 配置文件目录应该没有问题，spring-servlet.xml我放在WEB-INFO下，因为去掉service中的那个dao，就能正常了。也就说说，在没有service的时候controller能够正常工作。 ######################################################################### 严重: StandardWrapper.Throwable org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping': Initialization of bean failed; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'schoolCtrl': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: private com.cn.wuxiong.spring.school.service.SchoolService com.cn.wuxiong.spring.school.controller.SchoolCtrl.schoolService; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'schoolService': Injection of resource dependencies failed; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [com.cn.wuxiong.spring.school.dao.StudentDao] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@javax.annotation.Resource(shareable=true, mappedName=, description=, name=, type=class java.lang.Object, authenticationType=CONTAINER)} at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:529) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:458) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:289) at org.springframework.web.servlet.DispatcherServlet.createDefaultStrategy(DispatcherServlet.java:810) at org.springframework.web.servlet.DispatcherServlet.getDefaultStrategies(DispatcherServlet.java:779) at org.springframework.web.servlet.DispatcherServlet.initHandlerMappings(DispatcherServlet.java:549) at org.springframework.web.servlet.DispatcherServlet.initStrategies(DispatcherServlet.java:443) at org.springframework.web.servlet.DispatcherServlet.onRefresh(DispatcherServlet.java:432) at org.springframework.web.servlet.FrameworkServlet.onApplicationEvent(FrameworkServlet.java:772) at org.springframework.web.servlet.FrameworkServlet$ContextRefreshListener.onApplicationEvent(FrameworkServlet.java:1083) at org.springframework.web.servlet.FrameworkServlet$ContextRefreshListener.onApplicationEvent(FrameworkServlet.java:1080) at org.springframework.context.event.GenericApplicationListenerAdapter.onApplicationEvent(GenericApplicationListenerAdapter.java:51) at org.springframework.context.event.SourceFilteringListener.onApplicationEventInternal(SourceFilteringListener.java:96) at org.springframework.context.event.SourceFilteringListener.onApplicationEvent(SourceFilteringListener.java:68) at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:96) at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:334) at org.springframework.context.support.AbstractApplicationContext.finishRefresh(AbstractApplicationContext.java:948) at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:482) at org.springframework.web.servlet.FrameworkServlet.configureAndRefreshWebApplicationContext(FrameworkServlet.java:651) at org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:599) at org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:665) at org.springframework.web.servlet.FrameworkServlet.initWebApplicationContext(FrameworkServlet.java:518) at org.springframework.web.servlet.FrameworkServlet.initServletBean(FrameworkServlet.java:459) at org.springframework.web.servlet.HttpServletBean.init(HttpServletBean.java:136) at javax.servlet.GenericServlet.init(GenericServlet.java:160) at org.apache.catalina.core.StandardWrapper.initServlet(StandardWrapper.java:1280) at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1193) at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:1088) at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:5176) at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5460) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1559) at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1549) at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303) at java.util.concurrent.FutureTask.run(FutureTask.java:138) at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:895) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:918) at java.lang.Thread.run(Thread.java:662) Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'schoolCtrl': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: private com.cn.wuxiong.spring.school.service.SchoolService com.cn.wuxiong.spring.school.controller.SchoolCtrl.schoolService; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'schoolService': Injection of resource dependencies failed; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [com.cn.wuxiong.spring.school.dao.StudentDao] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@javax.annotation.Resource(shareable=true, mappedName=, description=, name=, type=class java.lang.Object, authenticationType=CONTAINER)} at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:289) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1146) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:519) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:458) at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:296) at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:223) at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:293) at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:194) at org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:1117) at org.springframework.web.servlet.handler.AbstractUrlHandlerMapping.registerHandler(AbstractUrlHandlerMapping.java:287) at org.springframework.web.servlet.handler.AbstractUrlHandlerMapping.registerHandler(AbstractUrlHandlerMapping.java:266) at org.springframework.web.servlet.handler.AbstractDetectingUrlHandlerMapping.detectHandlers(AbstractDetectingUrlHandlerMapping.java:82) at org.springframework.web.servlet.handler.AbstractDetectingUrlHandlerMapping.initApplicationContext(AbstractDetectingUrlHandlerMapping.java:58) at org.springframework.context.support.ApplicationObjectSupport.initApplicationContext(ApplicationObjectSupport.java:119) at org.springframework.web.context.support.WebApplicationObjectSupport.initApplicationContext(WebApplicationObjectSupport.java:72) at org.springframework.context.support.ApplicationObjectSupport.setApplicationContext(ApplicationObjectSupport.java:73) at org.springframework.context.support.ApplicationContextAwareProcessor.invokeAwareInterfaces(ApplicationContextAwareProcessor.java:117) at org.springframework.context.support.ApplicationContextAwareProcessor.postProcessBeforeInitialization(ApplicationContextAwareProcessor.java:92) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyBeanPostProcessorsBeforeInitialization(AbstractAutowireCapableBeanFactory.java:396) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1505) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:521) ... 37 more

[潇湘暮雨]

Caused by: org.springframework.beans.factory.BeanCreationException: Could not autowire field: private com.cn.wuxiong.spring.school.service.SchoolService com.cn.wuxiong.spring.school.controller.SchoolCtrl.schoolService; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'schoolService': Injection of resource dependencies failed; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [com.cn.wuxiong.spring.school.dao.StudentDao] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@javax.annotation.Resource(shareable=true, mappedName=, description=, name=, type=class java.lang.Object, authenticationType=CONTAINER)} at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:517) at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:87) at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:286) ... 57 more Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'schoolService': Injection of resource dependencies failed; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [com.cn.wuxiong.spring.school.dao.StudentDao] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@javax.annotation.Resource(shareable=true, mappedName=, description=, name=, type=class java.lang.Object, authenticationType=CONTAINER)} at org.springframework.context.annotation.CommonAnnotationBeanPostProcessor.postProcessPropertyValues(CommonAnnotationBeanPostProcessor.java:306) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1146) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:519) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:458) at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:296) at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:223) at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:293) at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:194) at org.springframework.beans.factory.support.DefaultListableBeanFactory.findAutowireCandidates(DefaultListableBeanFactory.java:912) at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:855) at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:770) at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:489) ... 59 more Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [com.cn.wuxiong.spring.school.dao.StudentDao] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@javax.annotation.Resource(shareable=true, mappedName=, description=, name=, type=class java.lang.Object, authenticationType=CONTAINER)} at org.springframework.beans.factory.support.DefaultListableBeanFactory.raiseNoSuchBeanDefinitionException(DefaultListableBeanFactory.java:988) at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:858) at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:770) at org.springframework.context.annotation.CommonAnnotationBeanPostProcessor.autowireResource(CommonAnnotationBeanPostProcessor.java:440) at org.springframework.context.annotation.CommonAnnotationBeanPostProcessor.getResource(CommonAnnotationBeanPostProcessor.java:418) at org.springframework.context.annotation.CommonAnnotationBeanPostProcessor$ResourceElement.getResourceToInject(CommonAnnotationBeanPostProcessor.java:546) at org.springframework.beans.factory.annotation.InjectionMetadata$InjectedElement.inject(InjectionMetadata.java:150) at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:87) at org.springframework.context.annotation.CommonAnnotationBeanPostProcessor.postProcessPropertyValues(CommonAnnotationBeanPostProcessor.java:303) ... 70 more 2013-12-11 15:48:19 org.apache.catalina.core.StandardContext loadOnStartup 严重: Servlet /SpringProject threw load() exception org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [com.cn.wuxiong.spring.school.dao.StudentDao] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@javax.annotation.Resource(shareable=true, mappedName=, description=, name=, type=class java.lang.Object, authenticationType=CONTAINER)} at org.springframework.beans.factory.support.DefaultListableBeanFactory.raiseNoSuchBeanDefinitionException(DefaultListableBeanFactory.java:988) at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:858) at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:770) at org.springframework.context.annotation.CommonAnnotationBeanPostProcessor.autowireResource(CommonAnnotationBeanPostProcessor.java:440) at org.springframework.context.annotation.CommonAnnotationBeanPostProcessor.getResource(CommonAnnotationBeanPostProcessor.java:418) at org.springframework.context.annotation.CommonAnnotationBeanPostProcessor$ResourceElement.getResourceToInject(CommonAnnotationBeanPostProcessor.java:546) at org.springframework.beans.factory.annotation.InjectionMetadata$InjectedElement.inject(InjectionMetadata.java:150) at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:87) at org.springframework.context.annotation.CommonAnnotationBeanPostProcessor.postProcessPropertyValues(CommonAnnotationBeanPostProcessor.java:303) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1146) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:519) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:458) at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:296) at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:223) at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:293) at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:194) at org.springframework.beans.factory.support.DefaultListableBeanFactory.findAutowireCandidates(DefaultListableBeanFactory.java:912) at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:855) at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:770) at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:489)

[潇湘暮雨]

at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:87) at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:286) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1146) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:519) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:458) at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:296) at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:223) at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:293) at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:194) at org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:1117) at org.springframework.web.servlet.handler.AbstractUrlHandlerMapping.registerHandler(AbstractUrlHandlerMapping.java:287) at org.springframework.web.servlet.handler.AbstractUrlHandlerMapping.registerHandler(AbstractUrlHandlerMapping.java:266) at org.springframework.web.servlet.handler.AbstractDetectingUrlHandlerMapping.detectHandlers(AbstractDetectingUrlHandlerMapping.java:82) at org.springframework.web.servlet.handler.AbstractDetectingUrlHandlerMapping.initApplicationContext(AbstractDetectingUrlHandlerMapping.java:58) at org.springframework.context.support.ApplicationObjectSupport.initApplicationContext(ApplicationObjectSupport.java:119) at org.springframework.web.context.support.WebApplicationObjectSupport.initApplicationContext(WebApplicationObjectSupport.java:72) at org.springframework.context.support.ApplicationObjectSupport.setApplicationContext(ApplicationObjectSupport.java:73) at org.springframework.context.support.ApplicationContextAwareProcessor.invokeAwareInterfaces(ApplicationContextAwareProcessor.java:117) at org.springframework.context.support.ApplicationContextAwareProcessor.postProcessBeforeInitialization(ApplicationContextAwareProcessor.java:92) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyBeanPostProcessorsBeforeInitialization(AbstractAutowireCapableBeanFactory.java:396) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1505) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:521) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:458) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:289) at org.springframework.web.servlet.DispatcherServlet.createDefaultStrategy(DispatcherServlet.java:810) at org.springframework.web.servlet.DispatcherServlet.getDefaultStrategies(DispatcherServlet.java:779) at org.springframework.web.servlet.DispatcherServlet.initHandlerMappings(DispatcherServlet.java:549) at org.springframework.web.servlet.DispatcherServlet.initStrategies(DispatcherServlet.java:443) at org.springframework.web.servlet.DispatcherServlet.onRefresh(DispatcherServlet.java:432) at org.springframework.web.servlet.FrameworkServlet.onApplicationEvent(FrameworkServlet.java:772) at org.springframework.web.servlet.FrameworkServlet$ContextRefreshListener.onApplicationEvent(FrameworkServlet.java:1083) at org.springframework.web.servlet.FrameworkServlet$ContextRefreshListener.onApplicationEvent(FrameworkServlet.java:1080) at org.springframework.context.event.GenericApplicationListenerAdapter.onApplicationEvent(GenericApplicationListenerAdapter.java:51) at org.springframework.context.event.SourceFilteringListener.onApplicationEventInternal(SourceFilteringListener.java:96) at org.springframework.context.event.SourceFilteringListener.onApplicationEvent(SourceFilteringListener.java:68) at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:96) at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:334) at org.springframework.context.support.AbstractApplicationContext.finishRefresh(AbstractApplicationContext.java:948) at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:482) at org.springframework.web.servlet.FrameworkServlet.configureAndRefreshWebApplicationContext(FrameworkServlet.java:651) at org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:599) at org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:665) at org.springframework.web.servlet.FrameworkServlet.initWebApplicationContext(FrameworkServlet.java:518) at org.springframework.web.servlet.FrameworkServlet.initServletBean(FrameworkServlet.java:459) at org.springframework.web.servlet.HttpServletBean.init(HttpServletBean.java:136) at javax.servlet.GenericServlet.init(GenericServlet.java:160) at org.apache.catalina.core.StandardWrapper.initServlet(StandardWrapper.java:1280) at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1193) at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:1088) at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:5176) at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5460) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1559) at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1549) at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303) at java.util.concurrent.FutureTask.run(FutureTask.java:138) at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:895) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:918) at java.lang.Thread.run(Thread.java:662)

[oh_Maxy]

嗯，你的Service使用到了StudentDao，但是没有找到StudentDao 的实现类啊？ 或者说，你把service里的dao类型换成StudentDaoEx 试试。

[whos2002110]

public interface StudentDao extends PagingAndSortingRepository<Student, Long>,StudentDaoEx {//
}

我初步估计是应为StudentDao集成了StudentDaoEx导致的,因为你这里的StudentDao是spring自己实现的,但是我估计他只针对PagingAndSortingRepository里面定义的方法,而一旦你继承了自己StudentDaoEx增加了方法spring无法实现,因此也就直接无法给你实例化出一个StudentDao. Spring Data我很久前了解过,你去掉后面继承的 StudentDaoEx试下能不能实例化成功

[赵琼]

你好，lz，最后这个问题解决了没有，是怎么解决的。我也遇到这样的问题