报错如下：

org.apache.ibatis.binding.BindingException: Invalid bound statement (not found): com.newhope.interview.dao.UserMapper.add

    at org.apache.ibatis.binding.MapperMethod$SqlCommand.<init>(MapperMethod.java:225)

    at org.apache.ibatis.binding.MapperMethod.<init>(MapperMethod.java:48)

    at org.apache.ibatis.binding.MapperProxy.cachedMapperMethod(MapperProxy.java:65)

    at org.apache.ibatis.binding.MapperProxy.invoke(MapperProxy.java:58)

    at com.sun.proxy.$Proxy60.add(Unknown Source)

    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)

    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

    at java.lang.reflect.Method.invoke(Method.java:498)

    at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:333)

    at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:190)

    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157)

    at org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:136)

    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)

    at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:213)

    at com.sun.proxy.$Proxy62.add(Unknown Source)

    at com.newhope.interview.service.impl.UserServiceImpl.add(UserServiceImpl.java:29)

    at com.newhope.interview.controller.UserController.add(UserController.java:66)

    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)

    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

    at java.lang.reflect.Method.invoke(Method.java:498)

    at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:205)

    at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:133)

    at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:97)

    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:827)

    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:738)

    at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85)

    at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:967)

    at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:901)

    at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970)

    at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:872)

    at javax.servlet.http.HttpServlet.service(HttpServlet.java:661)

    at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846)

    at javax.servlet.http.HttpServlet.service(HttpServlet.java:742)

    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)

    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)

    at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)

    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)

    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)

    at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:99)

    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)

    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)

    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)

    at org.springframework.web.filter.HttpPutFormContentFilter.doFilterInternal(HttpPutFormContentFilter.java:108)

    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)

    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)

    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)

    at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:81)

    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)

    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)

    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)

    at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:197)

    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)

    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)

    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)

    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:199)

    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)

    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:478)

    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140)

    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81)

    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)

    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342)

    at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:803)

    at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)

    at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:868)

    at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1459)

    at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)

    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)

    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)

    at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)

    at java.lang.Thread.run(Thread.java:748)

分析问题：

出现方法找不到的问题，在spring boot项目中，有几个原因

1.application.properties配置文件中指定mybatis的mapper.xml映射文件位置是否和项目中xml文件位置相一致

2.xml中指定的namespace位置是否可以对应实际mapper.java映射接口的位置

3.映射文件中的方法名  是否对应  映射接口中的方法名

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