spring mybatis 整合问题Error parsing Mapper XML. Cause: java.lang.NullPointerException

最新推荐文章于 2025-01-11 22:12:46 发布
最新推荐文章于 2025-01-11 22:12:46 发布
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文章标签： java 网络
原文链接：http://www.cnblogs.com/waising/p/4462963.html
本文讨论了在使用MyBatis框架时遇到的初始化错误问题，特别是当配置文件路径设置不当时，如何导致多次扫描同一配置文件并引发错误。提供了修正配置的方法，避免了此类问题的发生。

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14:30:40,872 DEBUG SqlSessionFactoryBean:431 - Parsed configuration file: 'class path resource [mybatis/mybatis-config.xml]'
14:30:40,883  WARN XmlWebApplicationContext:489 - Exception encountered during context initialization - cancelling refresh attempt
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.mybatis.spring.mapper.MapperScannerConfigurer#0' defined in file

[E:\IdeaProjects\xgexpress\target\xgexpress\WEB-INF\classes\spring\spring-context.xml]: Initialization of bean failed; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sqlSessionFactory' defined in file

[E:\IdeaProjects\xgexpress\target\xgexpress\WEB-INF\classes\spring\spring-context.xml]: Invocation of init method failed; nested exception is org.springframework.core.NestedIOException: Failed to parse mapping resource:

'file [E:\IdeaProjects\xgexpress\target\xgexpress\WEB-INF\classes\mybatis\mybatis-config.xml]';

nested exception is org.apache.ibatis.builder.BuilderException: Error parsing Mapper XML. Cause: java.lang.NullPointerException
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.

doCreateBean(AbstractAutowireCapableBeanFactory.java:547)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:475)
    at org.springframework.beans.factory.support.AbstractBeanFactory1.getObject(AbstractBeanFactory.java:302)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:228)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:298)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:198)
    at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors(PostProcessorRegistrationDelegate.java:116)
    at org.springframework.context.support.AbstractApplicationContext.invokeBeanFactoryPostProcessors(AbstractApplicationContext.java:611)
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:464)
    at org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:403)
    at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:306)
    at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:106)
    at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4973)
    at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5467)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
    at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:901)
    at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:877)
    at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:632)
    at org.apache.catalina.startup.HostConfig.manageApp(HostConfig.java:1763)
    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.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:301)
    at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:819)
    at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:801)
    at org.apache.catalina.mbeans.MBeanFactory.createStandardContext(MBeanFactory.java:618)
    at org.apache.catalina.mbeans.MBeanFactory.createStandardContext(MBeanFactory.java:565)
    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.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:301)
    at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:819)
    at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:801)
    at javax.management.remote.rmi.RMIConnectionImpl.doOperation(RMIConnectionImpl.java:1487)
    at javax.management.remote.rmi.RMIConnectionImpl.access300(RMIConnectionImpl.java:97)
    at javax.management.remote.rmi.RMIConnectionImplPrivilegedOperation.run(RMIConnectionImpl.java:1328)
    at javax.management.remote.rmi.RMIConnectionImpl.doPrivilegedOperation(RMIConnectionImpl.java:1420)
    at javax.management.remote.rmi.RMIConnectionImpl.invoke(RMIConnectionImpl.java:848)
    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 sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:322)
    at sun.rmi.transport.Transport1.run(Transport.java:177)
    at sun.rmi.transport.Transport1.run(Transport.java:174)
    at java.security.AccessController.doPrivileged(Native Method)
    at sun.rmi.transport.Transport.serviceCall(Transport.java:173)
    at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:556)
    at sun.rmi.transport.tcp.TCPTransportConnectionHandler.run0(TCPTransport.java:811)
    at sun.rmi.transport.tcp.TCPTransportConnectionHandler.run(TCPTransport.java:670)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
    at java.util.concurrent.ThreadPoolExecutorWorker.run(ThreadPoolExecutor.java:615)
    at java.lang.Thread.run(Thread.java:745)

原因:

当配置

<property name="configLocation" value="classpath:mybatis/mybatis-config.xml"></property>

<property name="mapperLocations" value="classpath:mybatis/**/*.xml"></property>

会扫描两遍mybatis-config.xml文件 并没有按照文件夹级别扫描,而是文件也一起扫描了,不知道是不是mybatis的bug.

 

配置文件更改为

即可

转载于:https://www.cnblogs.com/waising/p/4462963.html

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namespace="com.itheima.mapper.MemberDaoMapper"> <!-- 插入会员（主键自增，不指定member_id） --> <insert id="insert" parameterType="com.itheima.pojo.Member" keyProperty="member_id" useGeneratedKeys="true"> insert into ms_member(uname, password, email, sex, mobile) values (#{uname}, #{password}, #{email}, #{sex}, #{mobile}) </insert> <!-- 批量插入（无需指定member_id） --> <insert id="insert1"> insert into ms_member(uname, password, email, sex, mobile) values ('李白', '123456', 'aabb@qq.com', 0, '2434234'), ('程咬金', '123456', 'yyrry@qq.com', 0, '234324') </insert> <!-- 根据ID查询会员 --> <select id="getMemberById" resultType="com.itheima.pojo.Member"> select member_id, uname, password, email, sex, mobile from ms_member where member_id = #{member_id} </select> <!-- 查询所有会员 --> <select id="findAll" resultType="com.itheima.pojo.Member"> select * from ms_member </select> <!-- 按用户名和性别查询（方法1：参数顺序传递） --> <select id="getMemberByUnameAndSex" resultType="com.itheima.pojo.Member"> select * from ms_member where uname = #{0} and sex = #{1} </select> <!-- 按用户名和性别查询（方法2：@Param注解命名参数） --> <select id="getMemberByUnameAndSex1" resultType="com.itheima.pojo.Member"> select * from ms_member where uname = #{uname} and sex = #{sex} </select> <!-- 按用户名和性别查询（方法3：Map参数） --> <select id="getMemberByUnameAndSex2" resultType="com.itheima.pojo.Member"> select * from ms_member where uname = #{uname} and sex = #{sex} </select> <!-- 按用户名和手机号查询（动态SQL） --> <select id="findMemberByUnameAndMobile" resultType="com.itheima.pojo.Member" parameterType="com.itheima.pojo.Member"> select * from ms_member where 1=1 <if test="uname != null and uname != ''"> and uname like concat('%', #{uname}, '%') </if> <if test="mobile != null and mobile != ''"> and mobile like concat('%', #{mobile}, '%') </if> </select> <!-- 删除会员 --> <delete id="deleteById" parameterType="Integer"> delete from ms_member where member_id = #{member_id} </delete> <!-- 更新会员 --> <update id="updateById" parameterType="com.itheima.pojo.Member"> update ms_member set uname = #{uname}, password = #{password}, email = #{email}, sex = #{sex}, mobile = #{mobile} where member_id = #{member_id} </update> </mapper>????<?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.itheima.mapper.MemberDaoMapper"> <!-- insert元素（修正后） --> <insert id="insert" parameterType="com.itheima.pojo.Member" keyProperty="member_id" useGeneratedKeys="true"> insert into ms_member(uname, password, email, sex, mobile) values (#{uname}, #{password}, #{email}, #{sex}, #{mobile}) </insert> <!-- 批量插入示例 --> <insert id="insert1"> insert into ms_member(uname, password, email, sex, mobile) values ('李白', '123456', 'aabb@qq.com', 0, '2434234'), ('程咬金', '123456', 'yyrry@qq.com', 0, '234324') </insert> <!-- 根据ID查询会员 --> <select id="getMemberById" resultType="com.itheima.pojo.Member"> select member_id, uname, password, email, sex, mobile from ms_member where member_id = #{member_id} </select> <!-- 查询所有会员 --> <select id="findAll" resultType="com.itheima.pojo.Member"> select * from ms_member </select> <!-- 按用户名和性别查询（修正方法名和SQL） --> <select id="getMemberByUnameAndSex" resultType="com.itheima.pojo.Member"> select * from ms_member where uname = #{uname} and sex = #{sex} </select> <select id="getMemberByUnameAndSex1" resultType="com.itheima.pojo.Member"> select * from ms_member where uname = #{uname} and sex = #{sex} </select> <select id="getMemberByUnameAndSex2" resultType="com.itheima.pojo.Member"> select * from ms_member where uname = #{uname} and sex = #{sex} </select> <!-- 按用户名和手机号查询（已修正mobile条件） --> <select id="findMemberByUnameAndMobile" resultType="com.itheima.pojo.Member" parameterType="com.itheima.pojo.Member"> select * from ms_member where 1=1 <if test="uname != null and uname != ''"> and uname like concat('%', #{uname}, '%') </if> <if test="mobile != null and mobile != ''"> and mobile like concat('%', #{mobile}, '%') </if> </select> <!-- delete元素 --> <delete id="deleteById" 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