Java Mybatis Spring注释异常_Java_Spring_Mybatis

Java Mybatis Spring注释异常

java spring

Java Mybatis Spring注释异常,java,spring,mybatis,Java,Spring,Mybatis,您好，我对使用spring和mybatis的autowire注释有问题。我做错了什么-在教程中，我们只应该在servlet配置中通过xml文件和扫描文件夹映射autowire接口 Tomcat返回NoSuchBeandFinitionException，比如看不到UserMapper接口。在se4vlet配置中创建bean返回错误它无法从接口创建bean 谢谢你的帮助 <annotation-driven /> <!-- enable autowire --&g

您好，我对使用spring和mybatis的autowire注释有问题。我做错了什么-在教程中，我们只应该在servlet配置中通过xml文件和扫描文件夹映射autowire接口

Tomcat返回NoSuchBeandFinitionException，比如看不到UserMapper接口。在se4vlet配置中创建bean返回错误它无法从接口创建bean

谢谢你的帮助

    <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>

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.

那么最后一个错误呢

        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

org.springframework.web.util.NestedServletException:请求处理失败；嵌套异常为org.apache.ibatis.binding.BindingException:无效的绑定语句（未找到）：pl.xxx.mappers.UserMapper.getUserById
org.springframework.web.servlet.FrameworkServlet.processRequest（FrameworkServlet.java:978）
org.springframework.web.servlet.FrameworkServlet.doGet（FrameworkServlet.java:857）
javaservlet.http.HttpServlet.service（HttpServlet.java:621）
org.springframework.web.servlet.FrameworkServlet.service（FrameworkServlet.java:842）
javaservlet.http.HttpServlet.service（HttpServlet.java:728）
根本原因
org.apache.ibatis.binding.BindingException:无效的绑定语句（未找到）：pl.xxx.mappers.UserMapper.getUserById
org.apache.ibatis.binding.MapperMethod$SqlCommand。（MapperMethod.java:189）
org.apache.ibatis.binding.MapperMethod.（MapperMethod.java:43）
org.apache.ibatis.binding.MapperProxy.cachedMapperMethod（MapperProxy.java:58）
org.apache.ibatis.binding.MapperProxy.invoke（MapperProxy.java:51）
com.sun.proxy.$Proxy132.getUserById（未知源）
pl.xxx.mappers.UserDAO.getUserById（UserDAO.java:22）
pl.xxx.eppm.controllers.MainPageController.mainController（MainPageController.java:24）
sun.reflect.NativeMethodAccessorImpl.invoke0（本机方法）
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）
javaservlet.http.HttpServlet.service（HttpServlet.java:621）
org.springframework.web.servlet.FrameworkServlet.service（FrameworkServlet.java:842）
javaservlet.http.HttpServlet.service（HttpServlet.java:728）
注意，Apache Tomcat/7.0.42日志中提供了根本原因的完整堆栈跟踪。
ApacheTomcat/7.0.42

检查“pl.xxx.mybatis.mappers”包名的额外mybatis部分。我猜它只是“pl.xxx.mappers”

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？长）：


选择id，
用户名，
密码，
活跃的
来自用户
其中id=#{userId}

相反，XML u可以做到这一点：

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();

}

import org.apache.ibatis.annotations.Select；
公共接口用户映射器{
@选择（“从id=#{userid}的用户中选择*）
员工getUserById（长id）；
@选择（“从用户中选择*）
列出getAllUsers（）；
}

我遇到了一个类似的问题，我在dao的sql查询中使用了它

GROUP_CONCAT(xyz SEPARATOR '<br/>')

GROUP_CONCAT（xyz分隔符“
”）

问题在于

，它在期待 \&\l\t\；br/\&\g\t\

发布这篇文章，希望这能帮助有类似问题的人。

请不要负面评价。

我认为您只是在面对特性（不是bug）：-）其中Java类名必须与mapper XML文件完全相同

您的用户映射器XML是针对pascal Case Java类名的camel Case

那么，你的问题是什么？什么不起作用？错误消息是什么？请小心Bowdzone谢谢，我对编辑帖子有问题，其中一部分被创建。你发布了一堆代码，却忘记了最重要的部分：异常的准确完整堆栈跟踪。好的，我添加了异常跟踪，只剩下一个问题-autowired字段未注入到控制器您在专用用户映射器UserDao的控制器中错过了@Autowired；Sergey您能再看到一个堆栈跟踪吗？尝试将parameterType更改为java.lang.Integer，同样。我将映射器保存在/resource/mappers/*.xml中-这是正确的语法？classpath*：/resources/mappers/*.xml

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

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

<!-- 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>

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

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();

}

GROUP_CONCAT(xyz SEPARATOR '<br/>')