我在整合mybatis和Spring的时候遇到了空指针异常，请各位大神看看这是什么原因导致的。
以下是我的applicationContext-base.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:util="http://www.springframework.org/schema/util" xmlns:context="http://www.springframework.org/schema/context"
xmlns:jdbc="http://www.springframework.org/schema/jdbc" xmlns:jee="http://www.springframework.org/schema/jee"
xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:task="http://www.springframework.org/schema/task"
xsi:schemaLocation="
http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd
http://www.springframework.org/schema/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc-4.0.xsd
http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-4.0.xsd
http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.0.xsd
http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-4.0.xsd
http://www.springframework.org/schema/task http://www.springframework.org/schema/task/spring-task-4.0.xsd">
<description>Spring公共配置</description>
<!-- 开启定时任务 -->
<task:annotation-driven/>
<context:component-scan base-package="com.ivo"></context:component-scan>
<context:component-scan base-package="com.ivo.mappers"></context:component-scan>
<!-- MyBatis配置 -->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="dataSource" ref="dataSource" />
<property name="typeAliasesPackage" value="com.ivo.model" />
<property name="mapperLocations" value="classpath:com/ivo/mybatis/*Mapper.xml" />
<property name="configLocation" value="classpath:com/ivo/mybatis/mybatisConfig.xml"></property>
</bean>
<bean id="sqlSessionTemplate" class="org.mybatis.spring.SqlSessionTemplate">
<constructor-arg index="0" ref="sqlSessionFactory" />
<!-- 这个执行器会批量执行更新语句, 还有SIMPLE 和 REUSE -->
<constructor-arg index="1" value="BATCH" />
</bean>
<!-- 扫描basePackage接口 -->
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<property name="basePackage" value="com.ivo.mappers" />
</bean>
<!-- 使用annotation定义事务 -->
<bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="dataSource"></property>
</bean>
<tx:annotation-driven transaction-manager="transactionManager" proxy-target-class="true" />
<!-- 数据源配置, 使用Tomcat JDBC连接池 -->
<bean id="dataSource" class="org.apache.tomcat.jdbc.pool.DataSource" destroy-method="close">
<!-- Connection Info -->
<property name="driverClassName" value="com.mysql.jdbc.Driver" />
<property name="url" value="jdbc:mysql://10.20.2.9/newspidertest" />
<property name="username" value="root" />
<property name="password" value="root" />
</bean>
</beans>
以下是我遇到的异常
DEBUG 2015-08-10 11:30:17,139 org.springframework.web.servlet.DispatcherServlet: DispatcherServlet with name 'talentPool' processing POST request for [/talentPool3/lc/login.do]
DEBUG 2015-08-10 11:30:17,142 org.springframework.web.servlet.handler.AbstractHandlerMethodMapping: Looking up handler method for path /lc/login.do
DEBUG 2015-08-10 11:30:17,145 org.springframework.web.servlet.handler.AbstractHandlerMethodMapping: Returning handler method [public void com.ivo.controller.LoginController.test(javax.servlet.http.HttpServletResponse,javax.servlet.http.HttpServletRequest) throws java.io.IOException]
DEBUG 2015-08-10 11:30:17,145 org.springframework.beans.factory.support.AbstractBeanFactory: Returning cached instance of singleton bean 'loginController'
in
DEBUG 2015-08-10 11:30:17,195 org.springframework.jdbc.datasource.DataSourceUtils: Fetching JDBC Connection from DataSource
DEBUG 2015-08-10 11:30:17,939 org.springframework.jdbc.datasource.DataSourceUtils: Returning JDBC Connection to DataSource
DEBUG 2015-08-10 11:30:17,940 org.springframework.web.servlet.handler.AbstractHandlerExceptionResolver: Resolving exception from handler [public void com.ivo.controller.LoginController.test(javax.servlet.http.HttpServletResponse,javax.servlet.http.HttpServletRequest) throws java.io.IOException]: java.lang.NullPointerException
DEBUG 2015-08-10 11:30:17,942 org.springframework.web.servlet.handler.AbstractHandlerExceptionResolver: Resolving exception from handler [public void com.ivo.controller.LoginController.test(javax.servlet.http.HttpServletResponse,javax.servlet.http.HttpServletRequest) throws java.io.IOException]: java.lang.NullPointerException
DEBUG 2015-08-10 11:30:17,942 org.springframework.web.servlet.handler.AbstractHandlerExceptionResolver: Resolving exception from handler [public void com.ivo.controller.LoginController.test(javax.servlet.http.HttpServletResponse,javax.servlet.http.HttpServletRequest) throws java.io.IOException]: java.lang.NullPointerException
DEBUG 2015-08-10 11:30:17,944 org.springframework.web.servlet.FrameworkServlet: Could not complete request
java.lang.NullPointerException
at com.ivo.controller.LoginController.test(LoginController.java:25)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at org.springframework.web.method.support.InvocableHandlerMethod.invoke(InvocableHandlerMethod.java:215)
at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:132)
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:104)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:749)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:689)
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:83)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:938)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:870)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:961)
at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:863)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:641)
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:837)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:168)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1002)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:585)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:312)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:744)
DEBUG 2015-08-10 11:30:17,946 org.springframework.beans.factory.support.AbstractBeanFactory: Returning cached instance of singleton bean 'sqlSessionFactory'
八月 10, 2015 11:30:17 上午 org.apache.catalina.core.StandardWrapperValve invoke
严重: Servlet.service() for servlet [talentPool] in context with path [/talentPool3] threw exception [Request processing failed; nested exception is java.lang.NullPointerException] with root cause
java.lang.NullPointerException
at com.ivo.controller.LoginController.test(LoginController.java:25)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at org.springframework.web.method.support.InvocableHandlerMethod.invoke(InvocableHandlerMethod.java:215)
at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:132)
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:104)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:749)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:689)
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:83)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:938)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:870)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:961)
at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:863)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:641)
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:837)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:168)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1002)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:585)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:312)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:744)
刚刚DEBUG了一下
报错为：Source not found for $Proxy16.selectUser(String) line: not available
以下是我在xml中sql和接口关联的配置.
<?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.ivo.mappers.UserMapper">
<select id="selectUser" parameterType="String" resultType="User">
select * from user where user_fk=#{username}
</select>
</mapper>
Thanks in advance~
已经解决了，原来是把userMapper.xml放错了地方，在配置中是要放到resource目录下的。