使用springmvc+mybatis时遇到的问题总结

1.运行起来后，输入url报如下信息：

HTTP Status 500 - Servlet.init() for servlet springmvc threw exception

javax.servlet.ServletException: Servlet.init() for servlet springmvc threw exceptionorg.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:503)org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:950)org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:421)org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1070)org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:611)org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.doRun(AprEndpoint.java:2466)org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:2455)java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)java.lang.Thread.run(Unknown Source)

root cause

org.springframework.beans.factory.BeanDefinitionStoreException: Failed to read candidate component class: file [D:\J2EEwork\.metadata\.plugins\org.eclipse.wst.server.core\tmp0\wtpwebapps\springmvc1210\WEB-INF\classes\cn\itcast\ssm\controller\ItemsController3.class]; nested exception is java.lang.IllegalArgumentExceptionorg.springframework.context.annotation.ClassPathScanningCandidateComponentProvider.findCandidateComponents(ClassPathScanningCandidateComponentProvider.java:281)org.springframework.context.annotation.ClassPathBeanDefinitionScanner.doScan(ClassPathBeanDefinitionScanner.java:242)org.springframework.context.annotation.ComponentScanBeanDefinitionParser.parse(ComponentScanBeanDefinitionParser.java:84)org.springframework.beans.factory.xml.NamespaceHandlerSupport.parse(NamespaceHandlerSupport.java:73)org.springframework.beans.factory.xml.BeanDefinitionParserDelegate.parseCustomElement(BeanDefinitionParserDelegate.java:1435)org.springframework.beans.factory.xml.BeanDefinitionParserDelegate.parseCustomElement(BeanDefinitionParserDelegate.java:1425)org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.parseBeanDefinitions(DefaultBeanDefinitionDocumentReader.java:184)org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.doRegisterBeanDefinitions(DefaultBeanDefinitionDocumentReader.java:140)org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.registerBeanDefinitions(DefaultBeanDefinitionDocumentReader.java:111)org.springframework.beans.factory.xml.XmlBeanDefinitionReader.registerBeanDefinitions(XmlBeanDefini

解决方案：<!-- <context:component-scan base-package="cn.itcast.ssm.controller"/> --><bean class="cn.itcast.ssm.controller.ItemsController3" /> 

配置handler的时候，将扫描的方式改成handler单个配置

2.如图springmvc1210是在springmvc1209编译过后复制过来的，可以看到springmvc1210的url中的项目名是springmvc1209而不是springmvc1210,要注意。

3.工程目录如下：要注意：在启用spring的相关配置的时候，路径不能写成config/spring/applicationContext.xml,而是写成spring/applicationContext.xml

4.如报以下错误信息，有可能是因为spring配置文件的路径不对，要仔细检查路径

root cause

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'selectController': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: com.JJL.Inter.UserServiceI com.JJL.Controller.SelectController.userMapper; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No matching bean of type [com.JJL.Inter.UserServiceI] 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:287)org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1106)org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:517)org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:456)org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:294)
5.遇到如下错误时，可能是加载db.properties出错了，可以不加载db.properties，将属性直接配置出来（如图）。
root cause 
org.mybatis.spring.MyBatisSystemException: nested exception is org.apache.ibatis.exceptions.PersistenceException: ### Error querying database.  Cause: org.springframework.jdbc.CannotGetJdbcConnectionException: Could not get JDBC Connection; nested exception is org.apache.commons.dbcp.SQLNestedException: Cannot load JDBC driver class '${jdbc.driver}'### The error may exist in file [D:\J2EEwork\.metadata\.plugins\org.eclipse.wst.server.core\tmp0\wtpwebapps\TestSB4\WEB-INF\classes\com\JJL\Mapper\UserMapper.xml]### The error may involve com.JJL.Inter.UserServiceI.selectById### The error occurred while executing a query### Cause: org.springframework.jdbc.CannotGetJdbcConnectionException: Could not get JDBC Connection; nested exception is org.apache.commons.dbcp.SQLNestedException: Cannot load JDBC driver class '${jdbc.driver}'org.mybatis.spring.MyBatisExceptionTranslator.translateExceptionIfPossible(MyBatisExceptionTranslator.java:73)

6.如碰到以下错误，有可能是配置的mapper扫描器不对
root cause 
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'selectController': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: com.JJL.Mapper.UserMapper com.JJL.Controller.SelectController.userMapper; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No matching bean of type [com.JJL.Mapper.UserMapper] 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)}
root cause 
org.springframework.beans.factory.BeanCreationException: Could not autowire field: com.JJL.Mapper.UserMapper com.JJL.Controller.SelectController.userMapper; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No matching bean of type [com.JJL.Mapper.UserMapper] 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)}
root cause 
org.springframework.beans.factory.NoSuchBeanDefinitionException: No matching bean of type [com.JJL.Mapper.UserMapper] 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)}
7.如碰到以下错误：有可能是web.xml中的spring配置有错或者有可能是因为applicationContext-*的缘故，将所有application文件配置在一起或许可以解决