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Mybatis Spring注释异常

[英]Mybatis Spring annotation exception

 原文  2015-02-05 07:02:39  1   4    java/ spring/ mybatis

问题描述

嗨，我在使用spring和mybatis进行自动装配注释时遇到问题。 我做错了-在教程中，我们只应在servlet配置中自动连接xml文件和scan文件夹所映射的接口。

Tomcat返回NoSuchBeanDefintionException就像不看到UserMapper接口。 在se4vlet config中创建bean返回错误，它无法从接口创建bean。

感谢帮助。 

    <annotation-driven />
    <!-- enable autowire -->
    <context:annotation-config />
    <context:component-scan base-package="pl.xxx.eppm.controllers">        /context:component-scan>
    <context:component-scan base-package="pl.xxx.mappers"></context:component-scan>

    <resources mapping="/css/**" location="/WEB-INF/frontend/css/" />
    <resources mapping="/js/**" location="/WEB-INF/frontend/js/" /> 


    <beans:bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
         <beans:property name="driverClassName" value="com.mysql.jdbc.Driver"/>
         <beans:property name="url" value="jdbc:mysql://localhost:3306/eppm"/>
         <beans:property name="username" value="root"/>
         <beans:property name="password" value=""/>
    </beans:bean>

    <beans:bean id="templateResolver" class="org.thymeleaf.templateresolver.ServletContextTemplateResolver">
        <beans:property name="prefix" value="/WEB-INF/frontend/" />
        <beans:property name="suffix" value=".htm"   />
        <beans:property name="templateMode" value="HTML5" />        
    </beans:bean>

    <beans:bean id="templateEngine" class="org.thymeleaf.spring4.SpringTemplateEngine">
        <beans:property name="templateResolver" ref="templateResolver" />
    </beans:bean>

    <beans:bean class="org.thymeleaf.spring4.view.ThymeleafViewResolver">
        <beans:property name="templateEngine" ref="templateEngine" />
    </beans:bean>

    <beans:bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <beans:property name="dataSource" ref="dataSource" />
        <beans:property name="typeAliasesPackage" value="pl.xxx.mappers"/>
        <beans:property name="mapperLocations" value="classpath*:/resources/mappers/*.xml" />       
    </beans:bean>

    <beans:bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <beans:property name="basePackage" value="pl.xxx.mybatis.mappers" />
    </beans:bean>

userMapper.xml 

    <?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='pl.xxx.mappers.UserMapper'>

    <select id="getUserById" parameterType="int" resultType="pl.xxx.users.User">
        SELECT  id,
                username,
                password,
                isActive
        FROM USERS
        WHERE id = #{userId}
    </select>

    <select id="getUserByName" parameterType="string" resultType="pl.xxx.users.User">
        SELECT  id,
                username,
                password,
                isActive
        FROM USERS
        WHERE username = #{username}
    </select>   

    <resultMap type="User" id="UserResult">
        <id property="id" column="id" />
        <result property="username" column="username" />
        <result property="password" column="password" />        
        <result property="isActive" column="isActive" />
    </resultMap>

    <select id="getAllUsers" resultMap="UserResult">
        SELECT * FROM USERS
    </select>

    <insert id="insertUser" parameterType="User" useGeneratedKeys="true" keyProperty="id">
        INSERT INTO 
            USERS(username, password, isActive) 
            VALUES(#{username}, #{password}, #{isActive})
    </insert>

    <update id="updateUser" parameterType="User">
        UPDATE 
            USERS
        SET
            username = #{username},
            password = #{password},
            isActive = #{isActive}
        WHERE 
            id = #{id}
    </update> 

    <delete id="deleteUser" parameterType="int">
        DELETE FROM 
            USERS
        WHERE
            id = #{id} 
    </delete>

</mapper>

UserService.java 

    @Service
    public class UserDAO implements UserMapper {

    @Autowired
    private UserMapper userMapper;

    public void insertUser(User user) {
        // TODO Auto-generated method stub

    }

    public User getUserById(Integer userId) {
        return userMapper.getUserById(userId);
    }

    public User getUserByName(String username) {
        // TODO Auto-generated method stub
        return null;
    }

    public List<User> getAllUsers() {
        // TODO Auto-generated method stub
        return null;
    }

    public void updateUser(User user) {
        // TODO Auto-generated method stub

    }

    public void deleteUser(Integer userId) {
        // TODO Auto-generated method stub

    }


}

UserMapper.java 

     package pl.xxx.mappers;

     import java.util.List;

     import org.springframework.stereotype.Service;

     import pl.xxx.users.User; 


    public interface UserMapper {
     public void insertUser(User user);

     public User getUserById(Integer userId);

     public User getUserByName(String username);

     public List<User> getAllUsers();

     public void updateUser(User user);

     public void deleteUser(Integer userId);
     }

调节器 

    @Controller
    public class MainPageController {

    private UserMapper UserDao;

    @RequestMapping(value="/")
    public String mainController(){
        System.out.println(UserDao.getUserById(1));
        return "index";
    }

    @RequestMapping(value="/test")
    public String testController(){
        return "index";
    }
    }

跟踪： 

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

    type Exception report

    message Servlet.init() for servlet SpringDispatcherServlet threw exception

    description The server encountered an internal error that prevented it from fulfilling this request.

    exception

    javax.servlet.ServletException: Servlet.init() for servlet SpringDispatcherServlet threw exception
        org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
        org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
        org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953)
        org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
        org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1023)
        org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
        org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:312)
        java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
        java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
        java.lang.Thread.run(Thread.java:745)
    root cause

    org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'userDAO': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: private pl.xxx.mappers.UserMapper pl.xxx.mappers.UserDAO.userMapper; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [pl.xxx.mappers.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)}
        org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:334)
        org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1202)
        org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:537)
        org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:476)
        org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:303)
        org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)
        org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:299)
        org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:194)
        org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:762)
        org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:757)
        org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:480)
        org.springframework.web.servlet.FrameworkServlet.configureAndRefreshWebApplicationContext(FrameworkServlet.java:663)
        org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:629)
        org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:677)
        org.springframework.web.servlet.FrameworkServlet.initWebApplicationContext(FrameworkServlet.java:548)
        org.springframework.web.servlet.FrameworkServlet.initServletBean(FrameworkServlet.java:489)
        org.springframework.web.servlet.HttpServletBean.init(HttpServletBean.java:136)
        javax.servlet.GenericServlet.init(GenericServlet.java:160)
        org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
        org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
        org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953)
        org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
        org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1023)
        org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
        org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:312)
        java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
        java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
        java.lang.Thread.run(Thread.java:745)
    root cause

    org.springframework.beans.factory.BeanCreationException: Could not autowire field: private pl.xxx.mappers.UserMapper pl.xxx.mappers.UserDAO.userMapper; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [pl.xxx.mappers.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)}
        org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:561)
        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:1202)
        org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:537)
        org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:476)
        org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:303)
        org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)
        org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:299)
        org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:194)
        org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:762)
        org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:757)
        org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:480)
        org.springframework.web.servlet.FrameworkServlet.configureAndRefreshWebApplicationContext(FrameworkServlet.java:663)
        org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:629)
        org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:677)
        org.springframework.web.servlet.FrameworkServlet.initWebApplicationContext(FrameworkServlet.java:548)
        org.springframework.web.servlet.FrameworkServlet.initServletBean(FrameworkServlet.java:489)
        org.springframework.web.servlet.HttpServletBean.init(HttpServletBean.java:136)
        javax.servlet.GenericServlet.init(GenericServlet.java:160)
        org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
        org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
        org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953)
        org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
        org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1023)
        org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
        org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:312)
        java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
        java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
        java.lang.Thread.run(Thread.java:745)
    root cause

    org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [pl.xxx.mappers.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)}
        org.springframework.beans.factory.support.DefaultListableBeanFactory.raiseNoSuchBeanDefinitionException(DefaultListableBeanFactory.java:1308)
        org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1054)
        org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:949)
        org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:533)
        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:1202)
        org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:537)
        org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:476)
        org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:303)
        org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)
        org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:299)
        org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:194)
        org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:762)
        org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:757)
        org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:480)
        org.springframework.web.servlet.FrameworkServlet.configureAndRefreshWebApplicationContext(FrameworkServlet.java:663)
        org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:629)
        org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:677)
        org.springframework.web.servlet.FrameworkServlet.initWebApplicationContext(FrameworkServlet.java:548)
        org.springframework.web.servlet.FrameworkServlet.initServletBean(FrameworkServlet.java:489)
        org.springframework.web.servlet.HttpServletBean.init(HttpServletBean.java:136)
        javax.servlet.GenericServlet.init(GenericServlet.java:160)
        org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
        org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
        org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953)
        org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
        org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1023)
        org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
        org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:312)
        java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
        java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
        java.lang.Thread.run(Thread.java:745)
    note The full stack trace of the root cause is available in the Apache Tomcat/7.0.42 logs.

    Apache Tomcat/7.0.42

我还有一个问题： 

         org.springframework.web.util.NestedServletException: Request processing failed; nested exception is java.lang.NullPointerException
    org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:978)
    org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:857)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
    org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:842)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
root cause

java.lang.NullPointerException
    pl.xxx.eppm.controllers.MainPageController.mainController(MainPageController.java:22)
    sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    java.lang.reflect.Method.invoke(Method.java:483)
    org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:221)
    org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:137)
    org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:110)
    org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:777)
    org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:706)
    org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85)
    org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:943)
    org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:877)
    org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:966)
    org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:857)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
    org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:842)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
note The full stack trace of the root cause is available in the Apache Tomcat/7.0.42 logs.

然后是最后一个错误 

        org.springframework.web.util.NestedServletException: Request processing failed; nested exception is org.apache.ibatis.binding.BindingException: Invalid bound statement (not found): pl.xxx.mappers.UserMapper.getUserById
        org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:978)
        org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:857)
        javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
        org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:842)
        javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
    root cause

    org.apache.ibatis.binding.BindingException: Invalid bound statement (not found): pl.xxx.mappers.UserMapper.getUserById
        org.apache.ibatis.binding.MapperMethod$SqlCommand.<init>(MapperMethod.java:189)
        org.apache.ibatis.binding.MapperMethod.<init>(MapperMethod.java:43)
        org.apache.ibatis.binding.MapperProxy.cachedMapperMethod(MapperProxy.java:58)
        org.apache.ibatis.binding.MapperProxy.invoke(MapperProxy.java:51)
        com.sun.proxy.$Proxy132.getUserById(Unknown Source)
        pl.xxx.mappers.UserDAO.getUserById(UserDAO.java:22)
        pl.xxx.eppm.controllers.MainPageController.mainController(MainPageController.java:24)
        sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        java.lang.reflect.Method.invoke(Method.java:483)
        org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:221)
        org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:137)
        org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:110)
        org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:777)
        org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:706)
        org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85)
        org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:943)
        org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:877)
        org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:966)
        org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:857)
        javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
        org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:842)
        javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
    note The full stack trace of the root cause is available in the Apache Tomcat/7.0.42 logs.

    Apache Tomcat/7.0.42

4 个解决方案

解决方案1
 1 已采纳  2015-02-05 09:36:36

检查“ pl.xxx.mybatis.mappers”程序包名称中额外的mybatis部分。 我猜只是它的“ pl.xxx.mappers” 

<beans:bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <beans:property name="basePackage" value="pl.xxx.mybatis.mappers" />
</beans:bean>

解决方案2
 0  2015-06-09 13:21:11

尝试添加以下内容： 

<configuration>
    <...>
    <mappers>
        <mapper resource="UserMapper.xml" />
    <mappers>
</configuration>

UserMapper.xml： 

<!-- Using ResultMap -->
<resultMap id="result" type="pl.xxx.users.User">
    <id property="id" column="id"/>
    <result property="username" column="username" />
    <result property="password" column="password" />
    <result property="isactive" column="active" />
</resultMap>

检查User.id类型（java.lang.Integer？Long）： 

<select id="getUserById" parameterType="java.lang.Long" resultType="result">
    SELECT  id,
            username,
            password,
            isActive
    FROM USERS
    WHERE id = #{userId}
</select>

相反，您可以使用XML： 

import org.apache.ibatis.annotations.Select;

public interface UserMapper {
@Select("SELECT * FROM users WHERE id = #{userid}")
Employee getUserById(Long id);

@Select("SELECT * FROM users)
List<User> getAllUsers();

}

解决方案3
 0  2016-02-19 05:52:06

我有一个类似的问题，我在dao的sql查询中使用 

GROUP_CONCAT(xyz SEPARATOR '<br/>')

问题出在
<br />
，它期望的是\\＆\\ l \\ t \\; br / \\＆\\ g \\ t \\;

寄希望于此可以对遇到类似问题的人有所帮助。 请不要给予负面评价。

解决方案4
 0  2016-11-08 13:09:41

我认为您只是在面对功能（不是错误）:-)，其中Java类名必须与映射器XML文件完全相同。

您的用户映射器XML是camel Case，而不是pascal case Java类名。

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