无法使用服务类对象自动装配 ServiceImpl 类 Bean

【问题标题】：Unable to Autowire ServiceImpl Class Bean with Service Class Object无法使用服务类对象自动装配 ServiceImpl 类 Bean
【发布时间】：2015-11-13 09:58:57
【问题描述】：

我遇到的错误如下：

    root cause

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'loginAndSignUpController': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: private com.frosters.firststep.service.LoginAndSignUpService com.frosters.firststep.controller.LoginAndSignUpController.loginAndSignUpService; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [com.frosters.firststep.service.LoginAndSignUpService] 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)}
    org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:334)
    org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1214)
    org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:543)
    org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:482)
    org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:305)
    org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)
    org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:301)
    org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:196)
    org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:772)
    org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:834)
    org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:537)
    org.springframework.web.servlet.FrameworkServlet.configureAndRefreshWebApplicationContext(FrameworkServlet.java:667)
    org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:633)
    org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:681)
    org.springframework.web.servlet.FrameworkServlet.initWebApplicationContext(FrameworkServlet.java:552)
    org.springframework.web.servlet.FrameworkServlet.initServletBean(FrameworkServlet.java:493)
    org.springframework.web.servlet.HttpServletBean.init(HttpServletBean.java:136)
    javax.servlet.GenericServlet.init(GenericServlet.java:158)
    org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:505)
    org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
    org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:956)
    org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:423)
    org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1079)
    org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:625)
    org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:316)
    java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
    java.lang.Thread.run(Thread.java:745)
root cause

org.springframework.beans.factory.BeanCreationException: Could not autowire field: private com.frosters.firststep.service.LoginAndSignUpService com.frosters.firststep.controller.LoginAndSignUpController.loginAndSignUpService; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [com.frosters.firststep.service.LoginAndSignUpService] 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)}
    org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:571)
    org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:88)
    org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:331)
    org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1214)
    org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:543)
    org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:482)
    org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:305)
    org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)
    org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:301)
    org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:196)
    org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:772)
    org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:834)
    org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:537)
    org.springframework.web.servlet.FrameworkServlet.configureAndRefreshWebApplicationContext(FrameworkServlet.java:667)
    org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:633)
    org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:681)
    org.springframework.web.servlet.FrameworkServlet.initWebApplicationContext(FrameworkServlet.java:552)
    org.springframework.web.servlet.FrameworkServlet.initServletBean(FrameworkServlet.java:493)
    org.springframework.web.servlet.HttpServletBean.init(HttpServletBean.java:136)
    javax.servlet.GenericServlet.init(GenericServlet.java:158)
    org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:505)
    org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
    org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:956)
    org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:423)
    org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1079)
    org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:625)
    org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:316)
    java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
    java.lang.Thread.run(Thread.java:745)
root cause

org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [com.frosters.firststep.service.LoginAndSignUpService] 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)}
    org.springframework.beans.factory.support.DefaultListableBeanFactory.raiseNoSuchBeanDefinitionException(DefaultListableBeanFactory.java:1326)
    org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1072)
    org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:967)
    org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:543)
    org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:88)
    org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:331)
    org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1214)
    org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:543)
    org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:482)
    org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:305)
    org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)
    org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:301)
    org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:196)
    org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:772)
    org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:834)
    org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:537)
    org.springframework.web.servlet.FrameworkServlet.configureAndRefreshWebApplicationContext(FrameworkServlet.java:667)
    org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:633)
    org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:681)
    org.springframework.web.servlet.FrameworkServlet.initWebApplicationContext(FrameworkServlet.java:552)
    org.springframework.web.servlet.FrameworkServlet.initServletBean(FrameworkServlet.java:493)
    org.springframework.web.servlet.HttpServletBean.init(HttpServletBean.java:136)
    javax.servlet.GenericServlet.init(GenericServlet.java:158)
    org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:505)
    org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
    org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:956)
    org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:423)
    org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1079)
    org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:625)
    org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:316)
    java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
    java.lang.Thread.run(Thread.java:745)

我尝试通过使用@Component、@Service 注释来解决它，并尝试按照其他 StackOverflow 链接中的说明在 XML 配置中定义 bean，但我遇到了同样的错误。可能是我没有做对，或者我做错了什么。

ControllerClass如下：

package com.frosters.firststep.controller;

@RequestMapping(value="/login.html")
@Controller
public class LoginAndSignUpController {

    @Autowired
    private LoginAndSignUpService loginAndSignUpService;

    @ModelAttribute("userVO")
    public UserVO createUserVOBean(){
        return new UserVO();
    }

    @RequestMapping(method=RequestMethod.GET)
    public ModelAndView getLoginForm(){
        System.out.println("inside getLoginForm() method");
        return new ModelAndView("Login");
    }

    @RequestMapping(method=RequestMethod.POST)
    public ModelAndView verifyLogin(@ModelAttribute("userVO")UserVO userVO){
        System.out.println("inside verifyLogin");
        boolean result = loginAndSignUpService.verifyUser(userVO);
        ModelAndView model;
        if(!result){
            model = new ModelAndView("Login");
            model.addObject("loginError", "invalid username/password");
        }
        else
            model = new ModelAndView("LoginSuccess"); //temporary view
        return model;
    }

}

ServiceImplClass如下：

package com.frosters.firststep.serviceimpl;

public class LoginAndSignUpServiceImpl implements LoginAndSignUpService{

    @Autowired
    private LoginAndSignUpDAO loginAndSignUpDAO;

    public boolean verifyUser(UserVO userVO) {
        boolean result = loginAndSignUpDAO.validateUser(userVO);
        if(result)
            return true;
        else
            return false;
    }

}

DAOImpl 类如下：

package com.frosters.firststep.daoimpl;

public class LoginAndSignUpDAOImpl extends NamedParameterJdbcDaoSupport implements LoginAndSignUpDAO{

    public boolean validateUser(UserVO userVO) {
        String userName = userVO.getUserName();
        String password = userVO.getPassword();
        SqlParameterSource paramSource = new MapSqlParameterSource("username", userName);
        try{
        String pass = this.getNamedParameterJdbcTemplate().queryForObject(FSUtils.LOGIN_INFO, paramSource, String.class);
        if(pass != null && !pass.isEmpty()){
            if(pass.equals(password))
                return true;
            else
                return false;
        }
        else
            return false;
    }catch(EmptyResultDataAccessException ex){
        return false;
        }
    }


    }

web.xml 文件：

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
    xmlns="http://java.sun.com/xml/ns/javaee" 
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" 
    version="3.0">

  <display-name>Login And SignUp</display-name>

  <context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>/WEB-INF/classes/applicationContext.xml</param-value>
  </context-param>

    <servlet>
        <servlet-name>spring-dispatcher-servlet</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>/WEB-INF/classes/spring-dispatcher-servlet.xml</param-value>
        </init-param>
    </servlet>

    <servlet-mapping>
        <servlet-name>spring-dispatcher-servlet</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>

</web-app>

spring-dispatcher-servlet.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:aop="http://www.springframework.org/schema/aop"
    xmlns:context="http://www.springframework.org/schema/context"
    xmlns:jdbc="http://www.springframework.org/schema/jdbc"
    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/aop http://www.springframework.org/schema/aop/spring-aop-4.2.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.2.xsd
        http://www.springframework.org/schema/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc-4.2.xsd
        http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.2.xsd">

        <context:component-scan base-package="com.frosters.firststep" />
        <mvc:annotation-driven />

        <bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
            <property name="prefix" value="/WEB-INF/views/" />
            <property name="suffix" value=".jsp" />
        </bean>
</beans>

applicationContext.xml 我在其中定义了 bean：

<?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:jdbc="http://www.springframework.org/schema/jdbc"
    xmlns:lang="http://www.springframework.org/schema/lang"
    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-4.2.xsd
        http://www.springframework.org/schema/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc-4.2.xsd
        http://www.springframework.org/schema/lang http://www.springframework.org/schema/lang/spring-lang-4.2.xsd
        http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.2.xsd">

        <context:property-placeholder location="classpath:DbUtil.properties"/>

        <!-- <context:component-scan base-package="com.frosters.firststep" />
        <mvc:annotation-driven /> -->

        <bean name="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
            <property name="driverClassName" value="${jdbc.mysql.driverClassName}" />
            <property name="url" value="${jdbc.mysql.url}" />
            <property name="username" value="${jdbc.mysql.username}" />
            <property name="password" value="${jdbc.mysql.password}" />
        </bean>

        <bean id="loginAndSignUpDAO" class="com.frosters.firststep.daoimpl.LoginAndSignUpDAOImpl">
            <property name="dataSource" ref="dataSource" />
        </bean>

        <bean id="loginAndSignUpService" class="com.frosters.firststep.serviceimpl.LoginAndSignUpServiceImpl" />

</beans>

我也尝试在 spring-dispatcher-servlet.xml 中定义所有 bean，但这样做也不能解决问题。

谁能帮我看看哪里错了？ ....谢谢...

【问题讨论】：

    标签： java xml spring spring-mvc javabeans


    【解决方案1】：

    在您的 web.xml 中添加 ContextCLoaderListener

    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>

    【讨论】：

    • @Imran ..谢谢，但在我的 web.xml 中添加了这个之后，它正在分解更多.. 在重新部署战争期间，我遇到了更多异常，例如：上下文初始化期间遇到的异常 - 取消刷新尝试org.springframework.beans.factory.BeanCreationException：在 ServletContext 资源 [/WEB-INF/classes/applicationContext.xml] 中创建名称为“dataSource”的 bean 时出错：设置属性值时出错；嵌套异常是 org.springframework.beans.PropertyBatchUpdateException；嵌套的 PropertyAccessExceptions (1) 是：它现在无法创建任何 bean。
    • 你能发布完整的堆栈跟踪吗？还有一件事..我无法在 *DaoImpl 中找到 DataSource 属性。我认为这是错误。
    • 是的，那是因为我使用了 Spring DAO Support 并扩展了名为“NamedParameterJdbcDaoSupport”的超类（由 Spring 提供，并且在扩展此类之后，您不必定义 namedParameterJdbcTemplate 并在它通过自动装配。）和数据源可以通过 bean 提供，因为我在 ApplicationContext.xml 中提供了它。参考：link
    • 完整的堆栈跟踪超过了字符限制.. 所以我把它保存在 github.. 你可以在这里查看这些完整的堆栈跟踪：[github.com/guptaakashdeep/reflections/blob/master/StackTrace
    • 异常是因为无法加载驱动。在属性文件中放置“com.mysql.jdbc.Driver”而不是“com.mysql.jdbc.driver”。大写 D :)
    【解决方案2】：

    行：

    <context:component-scan base-package="com.frosters.firststep" />

    应该在 applicationContext.xml 中，而不是在 spring-dispatcher-servlet.xml 中。

    【讨论】：

      【解决方案3】：

      Spring 组件扫描，将扫描您的基础包中所有带有注释的 bean

      • @Repository（用于 DAO）
      • @组件
      • @Service（用于服务）
      • @Controller（用于控制器）

      由于 Spring 没有找到 DAOImpl 和 ServiceImpl 的任何注释，因此它不会初始化它们，因为你的 @Autowired 不起作用，因为没有合格的候选人。

      所以将@Repository 添加到您的DaoImpl 并将@Service 添加到您的ServiceImpl 类，然后重试。 

      package com.frosters.firststep.serviceimpl;

@Service
public class LoginAndSignUpServiceImpl implements LoginAndSignUpService{

    @Autowired
    private LoginAndSignUpDAO loginAndSignUpDAO;

    public boolean verifyUser(UserVO userVO) {
        boolean result = loginAndSignUpDAO.validateUser(userVO);
        if(result)
            return true;
        else
            return false;
    }

}

      和

      package com.frosters.firststep.daoimpl;

@Repository
public class LoginAndSignUpDAOImpl extends NamedParameterJdbcDaoSupport implements LoginAndSignUpDAO{

    public boolean validateUser(UserVO userVO) {
        String userName = userVO.getUserName();
        String password = userVO.getPassword();
        SqlParameterSource paramSource = new MapSqlParameterSource("username", userName);
        try{
        String pass = this.getNamedParameterJdbcTemplate().queryForObject(FSUtils.LOGIN_INFO, paramSource, String.class);
        if(pass != null && !pass.isEmpty()){
            if(pass.equals(password))
                return true;
            else
                return false;
        }
        else
            return false;
    }catch(EmptyResultDataAccessException ex){
        return false;
        }
    }


   }

      试试下面的顺序

      <mvc:annotation-driven />
<context:annotation-config />
<context:component-scan base-package="com.frosters.firststep" />

      或

      <mvc:annotation-driven />
<context:annotation-config />
<context:component-scan base-package="com.frosters.*" />

      正如 Imran 在他的帖子中指出的（这可能是主要原因），将上下文侦听器放入您的 web.xml

      <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>

      【讨论】：

      • @Raf...感谢您的建议，但我之前尝试过，但遇到了同样的错误，截至目前，我正在 applicationContext.xml中定义 bean >.
      • 我有时会在 Spring 上做噩梦，而且自动装配并不好玩。我们使用的是 Spring 和 Hibernate。无论如何，很久以前我为一个 uni 项目写了一个 spring 项目，看看那里的配置对你的情况有帮助吗github.com/rhamedy/SRPS/tree/master/src/main/webapp/WEB-INF
      • 我也试过这个，但是一旦我在我的 web.xml 中定义了监听器，它在重新部署时会抛出错误，因为它无法为 dataSource 设置属性：创建名称为 bean 时出错ServletContext 资源 [/WEB-INF/classes/applicationContext.xml] 中定义的 dataSource'：设置属性值时出错；嵌套异常是 org.springframework.beans.PropertyBatchUpdateException 属性“driverClassName”抛出异常；嵌套异常是 java.lang.IllegalStateException: 无法加载 JDBC 驱动程序类 [com.mysql.jdbc.driver]
      • 知道为什么在定义监听器后无法从属性文件中获取属性吗？
      • 如果你的 spring 配置中有很多错误，一个会抛出异常并且编译终止。一旦您修复了该错误，编译器就会继续检查其他错误，这就是为什么当您在 web.xml 中包含侦听器时会出现其他错误，这并不意味着侦听器导致了它。您的配置与我的不同（如 github 链接中所示），因此复制对您没有帮助，但请查看那里的配置组织结构。
      猜你喜欢
      • 1970-01-01
      • 1970-01-01
      • 1970-01-01
      • 1970-01-01
      • 2018-09-22
      • 2020-03-24
      • 2018-06-09
      • 2017-04-26
      • 2014-03-11
      相关资源
      最近更新 更多
      热门标签
      Java Python linux javascript Mysql C# Docker 算法 前端 SpringBoot Redis Vue spring 设计模式 .net core .net kubernetes c++ 数据库 数据结构 大数据 js 机器学习 微服务 Android Go 程序员 面试 JVM ASP.net core 云原生 人工智能 后端 PHP git CSS golang k8s Nginx Django mybatis 深度学习 多线程 React 架构 devops 爬虫 云计算 Spring Boot LeetCode