运行环境：jdk1.7.0_17+tomcat 7 + spring：3.2.0 +mybatis：3.2.7+ eclipse
错误：Could not autowire field: com.kjczwl.ssm.service.ItemsService com.kjczwl.ssm.controller.ItemsController.itemsservice;
错误原因：spring的@Autowired 无法注入service的bean（spring+mybatis）
解决办法： 在配置时候，写的mapper扫描注解，并且在接口实现出注解@Service都不能解决问题，在学习群中问了写大神，后面仔细检查了下，发现注解service id和 我的controller 里面注解引用的的不一样，我的service id “itemsService”，controller “itemsservice”,
错误代码：
1 Destroying singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@5c620819: defining beans [itemsController,org.springframework.context.annotation.internalConfigurationAnnotationProcessor,org.springframework.context.annotation.internalAutowiredAnnotationProcessor,org.springframework.context.annotation.internalRequiredAnnotationProcessor,org.springframework.context.annotation.internalCommonAnnotationProcessor,itemsServiceImpl,mvcContentNegotiationManager,org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping#0,org.springframework.format.support.FormattingConversionServiceFactoryBean#0,org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter#0,org.springframework.web.servlet.handler.MappedInterceptor#0,org.springframework.web.servlet.mvc.method.annotation.ExceptionHandlerExceptionResolver#0,org.springframework.web.servlet.mvc.annotation.ResponseStatusExceptionResolver#0,org.springframework.web.servlet.mvc.support.DefaultHandlerExceptionResolver#0,org.springframework.web.servlet.handler.BeanNameUrlHandlerMapping,org.springframework.web.servlet.mvc.HttpRequestHandlerAdapter,org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter,org.springframework.web.servlet.resource.DefaultServletHttpRequestHandler#0,org.springframework.web.servlet.handler.SimpleUrlHandlerMapping#0,org.springframework.web.servlet.view.InternalResourceViewResolver#0,org.springframework.context.annotation.ConfigurationClassPostProcessor.importAwareProcessor]; parent: org.springframework.beans.factory.support.DefaultListableBeanFactory@1afd5978 2 Context initialization failed 3 org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'itemsController': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: com.kjczwl.ssm.service.ItemsService com.kjczwl.ssm.controller.ItemsController.itemsssService; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No unique bean of type [com.kjczwl.ssm.service.ItemsService] is defined: expected single matching bean but found 2: [itemsServiceImpl, itemsService] 4 at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:288) 5 at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1120) 6 at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:522) 7 at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:461) 8 at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:295) 9 at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:223) 10 at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:292) 11 at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:194) 12 at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:607) 13 at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:932) 14 at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:479) 15 at org.springframework.web.servlet.FrameworkServlet.configureAndRefreshWebApplicationContext(FrameworkServlet.java:647) 16 at org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:598) 17 at org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:661) 18 at org.springframework.web.servlet.FrameworkServlet.initWebApplicationContext(FrameworkServlet.java:517) 19 at org.springframework.web.servlet.FrameworkServlet.initServletBean(FrameworkServlet.java:458) 20 at org.springframework.web.servlet.HttpServletBean.init(HttpServletBean.java:138) 21 at javax.servlet.GenericServlet.init(GenericServlet.java:160) 22 at org.apache.catalina.core.StandardWrapper.initServlet(StandardWrapper.java:1280) 23 at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1193) 24 at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:1088) 25 at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:5176) 26 at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5460) 27 at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) 28 at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1559) 29 at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1549) 30 at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334) 31 at java.util.concurrent.FutureTask.run(FutureTask.java:166) 32 at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) 33 at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) 34 at java.lang.Thread.run(Thread.java:722) 35 Caused by: org.springframework.beans.factory.BeanCreationException: Could not autowire field: com.kjczwl.ssm.service.ItemsService com.kjczwl.ssm.controller.ItemsController.itemsssService; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No unique bean of type [com.kjczwl.ssm.service.ItemsService] is defined: expected single matching bean but found 2: [itemsServiceImpl, itemsService] 36 at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:514) 37 at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:87) 38 at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:285) 39 ... 30 more 40 Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No unique bean of type [com.kjczwl.ssm.service.ItemsService] is defined: expected single matching bean but found 2: [itemsServiceImpl, itemsService] 41 at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:825) 42 at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:730) 43 at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:486) 44 ... 32 more
相关代码：
這是接口实现类
1 package com.kjczwl.ssm.service.impl; 2 3 import java.util.List; 4 5 import org.springframework.beans.factory.annotation.Autowired; 6 import org.springframework.stereotype.Service; 7 8 import com.kjczwl.ssm.mapper.ItemsMapperCustom; 9 import com.kjczwl.ssm.po.ItemsCustom; 10 import com.kjczwl.ssm.po.ItemsQueryVo; 11 import com.kjczwl.ssm.service.ItemsService; 12 13 /** 14 * 商品管理 15 * @author 唐烈 16 * 17 */ 18 @Service 19 public class ItemsServiceImpl implements ItemsService{ 20 @Autowired 21 ItemsMapperCustom itemsMapperCustom; 22 @Override 23 public List<ItemsCustom> findItemsList(ItemsQueryVo itemsQueryVo) throws Exception { 24 //通过ItemsMapperCustom来查询数据库 通过注解自动扫描 所以這里什么都不用写 25 return itemsMapperCustom.findItemsList(itemsQueryVo); 26 } 27 28 }
controller类
1 package com.kjczwl.ssm.controller; 2 3 import java.util.List; 4 5 import org.springframework.beans.factory.annotation.Autowired; 6 import org.springframework.stereotype.Controller; 7 import org.springframework.web.bind.annotation.RequestMapping; 8 import org.springframework.web.portlet.ModelAndView; 9 import com.kjczwl.ssm.po.ItemsCustom; 10 import com.kjczwl.ssm.service.ItemsService; 11 12 /** 13 *<p>package: com.kjczwl.ssm.controller</p> 14 *<p>Description:商品的controller(Handler) </p> 15 *<p>Company: Springmvc_Mybits_store</p> 16 *@author: 唐烈 17 * @date 2017下午5:30:58 18 */ 19 @Controller// 注解模式开发Controller 20 public class ItemsController { 21 // 注入 从service 中取得数据 22 @Autowired 23 ItemsService itemsservice; //错误问题出现這里 24 25 //注解扫描， 后面映射地址 可通过queryItems.action 访问 26 @RequestMapping("/queryItems") 27 public ModelAndView queryItems()throws Exception{ 28 //得到数据 29 List<ItemsCustom> itemsList = itemsssService.findItemsList(null); 30 // 构造ModelAndView 31 ModelAndView modelAndView = new ModelAndView(); 32 // 添加到内存区 外面直接“${} 条件表达式获取” 33 modelAndView.addObject("itemsList", itemsList); 34 //转发的路径 35 modelAndView.setViewName("pages/itemsList"); 36 37 return modelAndView; 38 } 39 }
applicationContext-service.xml 配置
1 <beans 2 xmlns="http://www.springframework.org/schema/beans" 3 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 4 xmlns:p="http://www.springframework.org/schema/p" 5 xmlns:context="http://www.springframework.org/schema/context" 6 xmlns:mvc="http://www.springframework.org/schema/mvc" 7 xmlns:tx="http://www.springframework.org/schema/tx" 8 xmlns:aop="http://www.springframework.org/schema/aop" 9 xsi:schemaLocation="http://www.springframework.org/schema/beans 10 http://www.springframework.org/schema/beans/spring-beans.xsd 11 http://www.springframework.org/schema/context 12 http://www.springframework.org/schema/context/spring-context-3.2.xsd 13 http://www.springframework.org/schema/mvc 14 http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd 15 http://www.springframework.org/schema/tx 16 http://www.springframework.org/schema/tx/spring-tx-3.2.xsd 17 http://www.springframectivework.org/schema/aop 18 http://www.springframework.org/schema/aop/spring-aop-3.2.xsd"> 19 <!-- 商品管理的service --> 20 <bean id="itemsService" class="com.kjczwl.ssm.service.impl.ItemsServiceImpl"/> 21 </beans>