zj155818 2021-06-20 22:28 采纳率: 0%
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创建名为“studentController”的bean时出错？

有没有大哥知道这是什么原因谢谢

 报错

类型 异常报告

消息 Servlet[springmvc]的Servlet.init（）引发异常

描述 服务器遇到一个意外的情况，阻止它完成请求。

例外情况

javax.servlet.ServletException: Servlet[springmvc]的Servlet.init（）引发异常
	org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:492)
	org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:104)
	org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:1025)
	org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:452)
	org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1201)
	org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:654)
	org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.doRun(AprEndpoint.java:2531)
	org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:2520)
	java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
	java.lang.Thread.run(Thread.java:748)
根本原因。

org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'studentController': Unsatisfied dependency expressed through field 'studentService'; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'com.it.service.IStudentService' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
	org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:643)
	org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:130)
	org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessProperties(AutowiredAnnotationBeanPostProcessor.java:399)
	org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1422)
	org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:594)
	org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:517)
	org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:323)
	org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)
	org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:321)
	org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202)
	org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:882)
	org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:878)
	org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:550)
	org.springframework.web.servlet.FrameworkServlet.configureAndRefreshWebApplicationContext(FrameworkServlet.java:702)
	org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:668)
	org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:716)
	org.springframework.web.servlet.FrameworkServlet.initWebApplicationContext(FrameworkServlet.java:591)
	org.springframework.web.servlet.FrameworkServlet.initServletBean(FrameworkServlet.java:530)
	org.springframework.web.servlet.HttpServletBean.init(HttpServletBean.java:170)
	javax.servlet.GenericServlet.init(GenericServlet.java:158)
	org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:492)
	org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:104)
	org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:1025)
	org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:452)
	org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1201)
	org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:654)
	org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.doRun(AprEndpoint.java:2531)
	org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:2520)
	java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
	java.lang.Thread.run(Thread.java:748)
根本原因。

org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'com.it.service.IStudentService' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
	org.springframework.beans.factory.support.DefaultListableBeanFactory.raiseNoMatchingBeanFound(DefaultListableBeanFactory.java:1700)
	org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1256)
	org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1210)
	org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:640)
	org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:130)
	org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessProperties(AutowiredAnnotationBeanPostProcessor.java:399)
	org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1422)
	org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:594)
	org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:517)
	org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:323)
	org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)
	org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:321)
	org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202)
	org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:882)
	org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:878)
	org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:550)
	org.springframework.web.servlet.FrameworkServlet.configureAndRefreshWebApplicationContext(FrameworkServlet.java:702)
	org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:668)
	org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:716)
	org.springframework.web.servlet.FrameworkServlet.initWebApplicationContext(FrameworkServlet.java:591)
	org.springframework.web.servlet.FrameworkServlet.initServletBean(FrameworkServlet.java:530)
	org.springframework.web.servlet.HttpServletBean.init(HttpServletBean.java:170)
	javax.servlet.GenericServlet.init(GenericServlet.java:158)
	org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:492)
	org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:104)
	org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:1025)
	org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:452)
	org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1201)
	org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:654)
	org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.doRun(AprEndpoint.java:2531)
	org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:2520)
	java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
	java.lang.Thread.run(Thread.java:748)
):注意 主要问题的全部 stack 信息可以在 server logs 里查看

控制类

package com.it.controller;

import java.util.List;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;
import com.it.entity.Student;
import com.it.service.IStudentService;



@Controller
public class StudentController{
	
	@Autowired
	IStudentService studentService;
	
	@RequestMapping("/add.do")
	public ModelAndView add(Student student) {
		ModelAndView mv=new ModelAndView();
		studentService.add(student);
		mv.setViewName("redirect:findAll.do");
		return mv;
	}	
	
	
	@RequestMapping("/delete.do")
	public ModelAndView delete(int id) {
		ModelAndView mv=new ModelAndView();
		studentService.delete(id);
		mv.setViewName("redirect:findAll.do");
		return mv;
	}
	
	@RequestMapping("/update.do")
	public ModelAndView update(Student student) {
		ModelAndView mv=new ModelAndView();
		studentService.update(student);
		mv.setViewName("redirect:findAll.do");
		return mv;
	}
	
	@RequestMapping("/findAll.do")
	public ModelAndView findAll() {
		ModelAndView mv=new ModelAndView();
		List<Student> list=studentService.findAllStudents();
		mv.addObject("list",list);
//		mv.setViewName("forward:/WEB-INF/jsp/list.jsp");
		mv.setViewName("list");
		
		return mv;
	}
	
	
	@RequestMapping("/findSingle.do")
	public ModelAndView detail(int id) {
		ModelAndView mv=new ModelAndView();
		Student stu=studentService.findStudentById(id);
		mv.addObject("stu",stu);
//		System.out.println(stu.getSname());
		mv.setViewName("detail");
		return mv;
	}
	
	
	@RequestMapping("/toUpdate.do")
	public ModelAndView toUpdate(int id) {
		ModelAndView mv=new ModelAndView();
		Student stu=studentService.findStudentById(id);
		mv.addObject("stu",stu);
		mv.setViewName("update");
		return mv;
	}
	
	@RequestMapping("/toadd.do")
	public ModelAndView toAdd() {
		ModelAndView mv=new ModelAndView();		
		mv.setViewName("add");
		return mv;
	}
	

	

	
}

dao层

package com.it.dao;

import java.util.List;

import com.it.entity.Student;

public interface IStudentDao {
	
	public void add(Student stu);
	public void delete(int id);
	public void update(Student stu);
	public List<Student> findAllStudents();
	public Student findStudentById(int id);
	
}

<?xml version="1.0" encoding="utf-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.it.dao.IStudentDao">
	<resultMap id="studentResultMap" type="com.it.entity.Student">
		<id property="sid" column="id" />
		<result property="sname" column="studentname" />
		<result property="sex" column="gender" />
		<result property="age" column="age" />		
	</resultMap>
	 	
   <select id="findAllStudents" resultType="com.it.entity.Student" resultMap="studentResultMap">
		SELECT
		*
		FROM STUDENT
 	</select>  	
 	
 	<select id="findStudentById"  parameterType="int"  resultMap="studentResultMap">
		SELECT 
			id,
			studentname,
			gender,
			age		
		FROM STUDENT where id=#{id}
 	</select> 	
 	
 	<!--   主键自增长 -->
 	<insert id="add" parameterType="Student"  keyProperty="sid" useGeneratedKeys="true">
		INSERT INTO student(studentname, gender, age)
		VALUES
		(#{sname}, #{sex}, #{age})
   </insert>    
   <delete id="delete" parameterType="int">
  	  delete from student where id=#{id}   
   </delete>   
    <update id="update" parameterType="Student">
		UPDATE Student SET studentname=#{sname},gender=#{sex},age=#{age} 
	    WHERE id= #{sid}
    </update>
</mapper>

service

package com.it.service;

import java.util.List;

import com.it.entity.Student;


public interface IStudentService {
	public void add(Student stu);
	public void delete(int id);
	public void update(Student stu);
	public List<Student> findAllStudents();
	public Student findStudentById(int id);
	
	public void testTransaction();
}

package com.it.service;


import java.util.List;

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

import com.it.dao.IStudentDao;

import com.it.entity.Student;

@Service
public class StudentServiceImpl implements IStudentService{
	
	@Autowired
	private IStudentDao studentDao;
//	public void setStudentDao(IStudentDao studentDao) {
//		this.studentDao = studentDao;
//	}
//	public StudentServiceImpl(){
//
//	}
	
	@Override
	public void add(Student stu) {
		studentDao.add(stu);		
	}

	@Override
	public void delete(int id) {
		studentDao.delete(id);		
	}

	@Override
	public void update(Student stu) {
		studentDao.update(stu);				
	}

	@Override
	public List<Student> findAllStudents() {		
		return studentDao.findAllStudents();
	}

	@Override
	public Student findStudentById(int id) {		
		return studentDao.findStudentById(id);
	}
	
	public void testTransaction(){
		delete(4);
		Integer.parseInt("a");
		delete(3);
	}
}

 applicationContext.xml

<?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:tx="http://www.springframework.org/schema/tx" xmlns:aop="http://www.springframework.org/schema/aop"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context.xsd
        http://www.springframework.org/schema/cache
        http://www.springframework.org/schema/cache/spring-cache.xsd
        http://www.springframework.org/schema/aop
        https://www.springframework.org/schema/aop/spring-aop.xsd">

    <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource">
        <property name="driverClassName" value="com.mysql.jdbc.Driver"/>
        <property name="url" value="jdbc:mysql://localhost:3306/big1905"/>
        <property name="username" value="root"/>
        <property name="password" value="190448"/>
    </bean>
    <!--定义事务管理器-->
    <bean id="txManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSource"/>
    </bean>
    <!--编写通知-->
    <tx:advice id="txAdvice" transaction-manager="txManager">
        <tx:attributes>
            <tx:method name="*" propagation="REQUIRED" isolation="DEFAULT" read-only="false"/>
        </tx:attributes>
    </tx:advice>
    <!--编写AOP,让spring自动切入事务到目标切面-->
    <aop:config>
        <!--定义切入点-->
        <aop:pointcut id="txPointcut" expression="execution(* com.it.service.*.*(..))" />
        <!--将事务通知与切入点组合-->
        <aop:advisor advice-ref="txAdvice" pointcut-ref="txPointcut"/>
    </aop:config>
    <!--配置sqlSessionFactory-->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource"/>
        <!--指定mybatis配置文件的位置-->
        <property name="configLocation" value="classpath:mybatis-config.xml"/>
    </bean>
    <!--配置mapper-->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="com.it.dao"/>
    </bean>
    <!--配置扫描-->
    <context:component-scan base-package="com.it"/>
</beans>

mybatis-config.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
    <typeAliases>
        <typeAlias alias="Student" type="com.it.entity.Student"/>
    </typeAliases>
    <mappers>
        <mapper resource="com/it/dao/StudentMapper.xml"/>
    </mappers>
</configuration>

spring-web.xml

<?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/beans
        http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context.xsd
        http://www.springframework.org/schema/mvc
        https://www.springframework.org/schema/mvc/spring-mvc.xsd">
<!--    配置扫描-->
    <context:component-scan base-package="com.it.controller"/>
<!--加载驱动-->
    <mvc:annotation-driven/>
<!--视图解析器-->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<!--        逻辑视图前缀-->
        <property name="prefix" value="/WEB-INF/jsp/"/>
<!--        逻辑视图后缀，匹配模式：前缀+逻辑视图+后缀，形成完整路径名-->
        <property name="suffix" value=".jsp"/>
    </bean>
</beans>

web.xml

<!DOCTYPE web-app PUBLIC
 "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
 "http://java.sun.com/dtd/web-app_2_3.dtd" >

<web-app>
<!--注册spring配置文件的位置-->
  <context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>classpath:applicationContext.xml</param-value>
  </context-param>
<!--注册字符集过滤器-->
  <filter>
    <filter-name>cef</filter-name>
    <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
    <init-param>
      <param-name>encoding</param-name>
      <param-value>UTF-8</param-value>
    </init-param>
  </filter>
  <filter-mapping>
    <filter-name>cef</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping>
  <!--注册servletContext监听器，创建spring容器-->
  <listener>
    <listener-class>org.springframework.web.context.ContextCleanupListener</listener-class>
  </listener>
<!--配置springMVC核心控制器-->
  <servlet>
    <servlet-name>springmvc</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <init-param>
      <param-name>contextConfigLocation</param-name>
      <param-value>classpath:spring-web.xml</param-value>
    </init-param>
  </servlet>
  <servlet-mapping>
    <servlet-name>springmvc</servlet-name>
    <url-pattern>/</url-pattern>
  </servlet-mapping>
</web-app>
  • 写回答

6条回答 默认 最新

  • CSDN专家-赖老师（软件之家） 2021-06-20 22:44
    关注

    无法注入

    com.it.service.IStudentService

    检查一下是否有逻辑错误。

    评论

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