无法使用服务 Class 对象自动装配 ServiceImpl Class Bean
Unable to Autowire ServiceImpl Class Bean with Service Class Object
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.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.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.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 Whosebug 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。
控制器Class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 Class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-调度员-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>
我也试过在 spring-dispatcher-servlet.xml 中定义所有的 bean，但是这样做也不能解决问题。
谁能帮我看看是哪里出了问题？ ....谢谢...
在您的 web.xml
中添加 ContextLoaderListener
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
Spring 组件扫描，将扫描您的基础包以查找所有用
注释的 beans
- @Repository（用于 DAO）
- @组件
- @Service（服务）
- @Controller（控制器）
由于Spring 没有找到 DAOImpl 和 ServiceImpl 的任何注释，因此它没有初始化它们，结果是您的 @Autowired 不起作用，因为没有合格的候选者。
所以将@Repository 添加到您的 DaoImpl 并将@Service 添加到您的 ServiceImpl 类 然后再试一次。
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;
}
}
}
尝试以下顺序
<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 post 中指出的那样（这可能是主要原因），将上下文侦听器置于您的 web.xml
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
行：
<context:component-scan base-package="com.frosters.firststep" />
应该在 applicationContext.xml 而不是 spring-dispatcher-servlet.xml.
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.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.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.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 Whosebug 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。
控制器Class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 Class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-调度员-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>
我也试过在 spring-dispatcher-servlet.xml 中定义所有的 bean，但是这样做也不能解决问题。
谁能帮我看看是哪里出了问题？ ....谢谢...
在您的 web.xml
中添加 ContextLoaderListener<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
Spring 组件扫描，将扫描您的基础包以查找所有用
注释的 beans- @Repository（用于 DAO）
- @组件
- @Service（服务）
- @Controller（控制器）
由于Spring 没有找到 DAOImpl 和 ServiceImpl 的任何注释，因此它没有初始化它们，结果是您的 @Autowired 不起作用，因为没有合格的候选者。
所以将@Repository 添加到您的 DaoImpl 并将@Service 添加到您的 ServiceImpl 类 然后再试一次。
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;
}
}
}
尝试以下顺序
<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 post 中指出的那样（这可能是主要原因），将上下文侦听器置于您的 web.xml
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
行：
<context:component-scan base-package="com.frosters.firststep" />
应该在 applicationContext.xml 而不是 spring-dispatcher-servlet.xml.