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Mybatis Spring注釋異常

[英]Mybatis Spring annotation exception

 原文  2015-02-05 07:02:39  5   4    java/ spring/ mybatis

問題描述

嗨，我在使用spring和mybatis進行自動裝配注釋時遇到問題。 我做錯了-在教程中，我們只應在servlet配置中自動連接xml文件和scan文件夾所映射的接口。

Tomcat返回NoSuchBeanDefintionException就像不看到UserMapper接口。 在se4vlet config中創建bean返回錯誤，它無法從接口創建bean。

感謝幫助。 

    <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);
     }

調節器 

    @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";
    }
    }

跟蹤： 

    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

我還有一個問題： 

         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.

然后是最后一個錯誤 

        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 個解決方案

解決方案1
 1 已采納  2015-02-05 09:36:36

檢查“ pl.xxx.mybatis.mappers”程序包名稱中額外的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>

解決方案2
 0  2015-06-09 13:21:11

嘗試添加以下內容： 

<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>

檢查User.id類型（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();

}

解決方案3
 0  2016-02-19 05:52:06

我有一個類似的問題，我在dao的sql查詢中使用 

GROUP_CONCAT(xyz SEPARATOR '<br/>')

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

寄希望於此可以對遇到類似問題的人有所幫助。 請不要給予負面評價。

解決方案4
 0  2016-11-08 13:09:41

我認為您只是在面對功能（不是錯誤）:-)，其中Java類名必須與映射器XML文件完全相同。

您的用戶映射器XML是camel Case，而不是pascal case Java類名。

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