HTTP Status 500 - Request processing failed; nested exception is org.mybatis.spring.MyBatisSystemExc
根本原因：
你在某个数据库链接工具Navicat中打开了连接，在Navicat中关闭这个数据库，或者直接把数据库连接关闭，或者直接关闭Navicat
这个bug真艹蛋，浪费我几个小时查bug，难道没有一个前辈遇到过我这个bug吗？
HTTP Status 500 - Request processing failed; nested exception is org.mybatis.spring.MyBatisSystemException: nested exception is org.apache.ibatis.exceptions.PersistenceException:
type Exception report
message Request processing failed; nested exception is org.mybatis.spring.MyBatisSystemException: nested exception is org.apache.ibatis.exceptions.PersistenceException:
description The server encountered an internal error that prevented it from fulfilling this request.
exception
org.springframework.web.util.NestedServletException: Request processing failed; nested exception is org.mybatis.spring.MyBatisSystemException: nested exception is org.apache.ibatis.exceptions.PersistenceException:
Error querying database. Cause: org.springframework.jdbc.CannotGetJdbcConnectionException: Could not get JDBC Connection; nested exception is org.apache.commons.dbcp.SQLNestedException: Error preloading the connection pool
The error may exist in file [E:\workspace\idea\mmall\target\mmall\WEB-INF\classes\mappers\UserMapper.xml]
The error may involve com.mmall.dao.UserMapper.checkUsername
The error occurred while executing a query
Cause: org.springframework.jdbc.CannotGetJdbcConnectionException: Could not get JDBC Connection; nested exception is org.apache.commons.dbcp.SQLNestedException: Error preloading the connection pool
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:943)
org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:833)
javax.servlet.http.HttpServlet.service(HttpServlet.java:650)
org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:807)
javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:108)
root cause
org.mybatis.spring.MyBatisSystemException: nested exception is org.apache.ibatis.exceptions.PersistenceException:
Error querying database. Cause: org.springframework.jdbc.CannotGetJdbcConnectionException: Could not get JDBC Connection; nested exception is org.apache.commons.dbcp.SQLNestedException: Error preloading the connection pool
The error may exist in file [E:\workspace\idea\mmall\target\mmall\WEB-INF\classes\mappers\UserMapper.xml]
The error may involve com.mmall.dao.UserMapper.checkUsername
The error occurred while executing a query
Cause: org.springframework.jdbc.CannotGetJdbcConnectionException: Could not get JDBC Connection; nested exception is org.apache.commons.dbcp.SQLNestedException: Error preloading the connection pool
org.mybatis.spring.MyBatisExceptionTranslator.translateExceptionIfPossible(MyBatisExceptionTranslator.java:79)
org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:447)
com.sun.proxy.$Proxy17.selectOne(Unknown Source)
org.mybatis.spring.SqlSessionTemplate.selectOne(SqlSessionTemplate.java:167)
org.apache.ibatis.binding.MapperMethod.execute(MapperMethod.java:82)
org.apache.ibatis.binding.MapperProxy.invoke(MapperProxy.java:53)
com.sun.proxy.$Proxy18.checkUsername(Unknown Source)
com.mmall.service.impl.UserServiceImpl.login(UserServiceImpl.java:19)
com.mmall.controller.portal.UserController.login(UserController.java:25)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
java.lang.reflect.Method.invoke(Method.java:606)
org.springframework.web.method.support.InvocableHandlerMethod.invoke(InvocableHandlerMethod.java:214)
org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:132)
org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:104)
org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:748)
org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:689)
org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:83)
org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:945)
org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:876)
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:931)
org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:833)
javax.servlet.http.HttpServlet.service(HttpServlet.java:650)
org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:807)
javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:108)
root cause
org.apache.ibatis.exceptions.PersistenceException:
Error querying database. Cause: org.springframework.jdbc.CannotGetJdbcConnectionException: Could not get JDBC Connection; nested exception is org.apache.commons.dbcp.SQLNestedException: Error preloading the connection pool
The error may exist in file [E:\workspace\idea\mmall\target\mmall\WEB-INF\classes\mappers\UserMapper.xml]
The error may involve com.mmall.dao.UserMapper.checkUsername
The error occurred while executing a query
Cause: org.springframework.jdbc.CannotGetJdbcConnectionException: Could not get JDBC Connection; nested exception is org.apache.commons.dbcp.SQLNestedException: Error preloading the connection pool
org.apache.ibatis.exceptions.ExceptionFactory.wrapException(ExceptionFactory.java:30)
org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:150)
org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:141)
org.apache.ibatis.session.defaults.DefaultSqlSession.selectOne(DefaultSqlSession.java:77)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
java.lang.reflect.Method.invoke(Method.java:606)
org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:434)
com.sun.proxy.$Proxy17.selectOne(Unknown Source)
org.mybatis.spring.SqlSessionTemplate.selectOne(SqlSessionTemplate.java:167)
org.apache.ibatis.binding.MapperMethod.execute(MapperMethod.java:82)
org.apache.ibatis.binding.MapperProxy.invoke(MapperProxy.java:53)
com.sun.proxy.$Proxy18.checkUsername(Unknown Source)
com.mmall.service.impl.UserServiceImpl.login(UserServiceImpl.java:19)
com.mmall.controller.portal.UserController.login(UserController.java:25)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
java.lang.reflect.Method.invoke(Method.java:606)
org.springframework.web.method.support.InvocableHandlerMethod.invoke(InvocableHandlerMethod.java:214)
org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:132)
org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:104)
org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:748)
org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:689)
org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:83)
org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:945)
org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:876)
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:931)
org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:833)
javax.servlet.http.HttpServlet.service(HttpServlet.java:650)
org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:807)
javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:108)
root cause
org.springframework.jdbc.CannotGetJdbcConnectionException: Could not get JDBC Connection; nested exception is org.apache.commons.dbcp.SQLNestedException: Error preloading the connection pool
org.springframework.jdbc.datasource.DataSourceUtils.getConnection(DataSourceUtils.java:80)
org.mybatis.spring.transaction.SpringManagedTransaction.openConnection(SpringManagedTransaction.java:84)
org.mybatis.spring.transaction.SpringManagedTransaction.getConnection(SpringManagedTransaction.java:70)
org.apache.ibatis.executor.BaseExecutor.getConnection(BaseExecutor.java:336)
org.apache.ibatis.executor.SimpleExecutor.prepareStatement(SimpleExecutor.java:84)
org.apache.ibatis.executor.SimpleExecutor.doQuery(SimpleExecutor.java:62)
org.apache.ibatis.executor.BaseExecutor.queryFromDatabase(BaseExecutor.java:324)
org.apache.ibatis.executor.BaseExecutor.query(BaseExecutor.java:156)
org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:109)
org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:83)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
java.lang.reflect.Method.invoke(Method.java:606)
org.apache.ibatis.plugin.Invocation.proceed(Invocation.java:49)
com.github.pagehelper.SqlUtil._processPage(SqlUtil.java:401)
com.github.pagehelper.SqlUtil.processPage(SqlUtil.java:374)
com.github.pagehelper.PageHelper.intercept(PageHelper.java:250)
org.apache.ibatis.plugin.Plugin.invoke(Plugin.java:61)
com.sun.proxy. P r o x y 23. q u e r y ( U n k n o w n S o u r c e ) o r g . a p a c h e . i b a t i s . s e s s i o n . d e f a u l t s . D e f a u l t S q l S e s s i o n . s e l e c t L i s t ( D e f a u l t S q l S e s s i o n . j a v a : 148 ) o r g . a p a c h e . i b a t i s . s e s s i o n . d e f a u l t s . D e f a u l t S q l S e s s i o n . s e l e c t L i s t ( D e f a u l t S q l S e s s i o n . j a v a : 141 ) o r g . a p a c h e . i b a t i s . s e s s i o n . d e f a u l t s . D e f a u l t S q l S e s s i o n . s e l e c t O n e ( D e f a u l t S q l S e s s i o n . j a v a : 77 ) s u n . r e f l e c t . N a t i v e M e t h o d A c c e s s o r I m p l . i n v o k e 0 ( N a t i v e M e t h o d ) s u n . r e f l e c t . N a t i v e M e t h o d A c c e s s o r I m p l . i n v o k e ( N a t i v e M e t h o d A c c e s s o r I m p l . j a v a : 57 ) s u n . r e f l e c t . D e l e g a t i n g M e t h o d A c c e s s o r I m p l . i n v o k e ( D e l e g a t i n g M e t h o d A c c e s s o r I m p l . j a v a : 43 ) j a v a . l a n g . r e f l e c t . M e t h o d . i n v o k e ( M e t h o d . j a v a : 606 ) o r g . m y b a t i s . s p r i n g . S q l S e s s i o n T e m p l a t e Proxy23.query(Unknown Source) org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:148) org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:141) org.apache.ibatis.session.defaults.DefaultSqlSession.selectOne(DefaultSqlSession.java:77) sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) java.lang.reflect.Method.invoke(Method.java:606) org.mybatis.spring.SqlSessionTemplate Proxy23.query(UnknownSource)org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:148)org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:141)org.apache.ibatis.session.defaults.DefaultSqlSession.selectOne(DefaultSqlSession.java:77)sun.reflect.NativeMethodAccessorImpl.invoke0(NativeMethod)sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)java.lang.reflect.Method.invoke(Method.java:606)org.mybatis.spring.SqlSessionTemplateSqlSessionInterceptor.invoke(SqlSessionTemplate.java:434)
com.sun.proxy. P r o x y 17. s e l e c t O n e ( U n k n o w n S o u r c e ) o r g . m y b a t i s . s p r i n g . S q l S e s s i o n T e m p l a t e . s e l e c t O n e ( S q l S e s s i o n T e m p l a t e . j a v a : 167 ) o r g . a p a c h e . i b a t i s . b i n d i n g . M a p p e r M e t h o d . e x e c u t e ( M a p p e r M e t h o d . j a v a : 82 ) o r g . a p a c h e . i b a t i s . b i n d i n g . M a p p e r P r o x y . i n v o k e ( M a p p e r P r o x y . j a v a : 53 ) c o m . s u n . p r o x y . Proxy17.selectOne(Unknown Source) org.mybatis.spring.SqlSessionTemplate.selectOne(SqlSessionTemplate.java:167) org.apache.ibatis.binding.MapperMethod.execute(MapperMethod.java:82) org.apache.ibatis.binding.MapperProxy.invoke(MapperProxy.java:53) com.sun.proxy. Proxy17.selectOne(UnknownSource)org.mybatis.spring.SqlSessionTemplate.selectOne(SqlSessionTemplate.java:167)org.apache.ibatis.binding.MapperMethod.execute(MapperMethod.java:82)org.apache.ibatis.binding.MapperProxy.invoke(MapperProxy.java:53)com.sun.proxy.Proxy18.checkUsername(Unknown Source)
com.mmall.service.impl.UserServiceImpl.login(UserServiceImpl.java:19)
com.mmall.controller.portal.UserController.login(UserController.java:25)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
java.lang.reflect.Method.invoke(Method.java:606)
org.springframework.web.method.support.InvocableHandlerMethod.invoke(InvocableHandlerMethod.java:214)
org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:132)
org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:104)
org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:748)
org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:689)
org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:83)
org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:945)
org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:876)
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:931)
org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:833)
javax.servlet.http.HttpServlet.service(HttpServlet.java:650)
org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:807)
javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:108)
root cause
org.apache.commons.dbcp.SQLNestedException: Error preloading the connection pool
org.apache.commons.dbcp.BasicDataSource.createDataSource(BasicDataSource.java:1398)
org.apache.commons.dbcp.BasicDataSource.getConnection(BasicDataSource.java:1044)
org.springframework.jdbc.datasource.DataSourceUtils.doGetConnection(DataSourceUtils.java:111)
org.springframework.jdbc.datasource.DataSourceUtils.getConnection(DataSourceUtils.java:77)
org.mybatis.spring.transaction.SpringManagedTransaction.openConnection(SpringManagedTransaction.java:84)
org.mybatis.spring.transaction.SpringManagedTransaction.getConnection(SpringManagedTransaction.java:70)
org.apache.ibatis.executor.BaseExecutor.getConnection(BaseExecutor.java:336)
org.apache.ibatis.executor.SimpleExecutor.prepareStatement(SimpleExecutor.java:84)
org.apache.ibatis.executor.SimpleExecutor.doQuery(SimpleExecutor.java:62)
org.apache.ibatis.executor.BaseExecutor.queryFromDatabase(BaseExecutor.java:324)
org.apache.ibatis.executor.BaseExecutor.query(BaseExecutor.java:156)
org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:109)
org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:83)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
java.lang.reflect.Method.invoke(Method.java:606)
org.apache.ibatis.plugin.Invocation.proceed(Invocation.java:49)
com.github.pagehelper.SqlUtil._processPage(SqlUtil.java:401)
com.github.pagehelper.SqlUtil.processPage(SqlUtil.java:374)
com.github.pagehelper.PageHelper.intercept(PageHelper.java:250)
org.apache.ibatis.plugin.Plugin.invoke(Plugin.java:61)
com.sun.proxy. P r o x y 23. q u e r y ( U n k n o w n S o u r c e ) o r g . a p a c h e . i b a t i s . s e s s i o n . d e f a u l t s . D e f a u l t S q l S e s s i o n . s e l e c t L i s t ( D e f a u l t S q l S e s s i o n . j a v a : 148 ) o r g . a p a c h e . i b a t i s . s e s s i o n . d e f a u l t s . D e f a u l t S q l S e s s i o n . s e l e c t L i s t ( D e f a u l t S q l S e s s i o n . j a v a : 141 ) o r g . a p a c h e . i b a t i s . s e s s i o n . d e f a u l t s . D e f a u l t S q l S e s s i o n . s e l e c t O n e ( D e f a u l t S q l S e s s i o n . j a v a : 77 ) s u n . r e f l e c t . N a t i v e M e t h o d A c c e s s o r I m p l . i n v o k e 0 ( N a t i v e M e t h o d ) s u n . r e f l e c t . N a t i v e M e t h o d A c c e s s o r I m p l . i n v o k e ( N a t i v e M e t h o d A c c e s s o r I m p l . j a v a : 57 ) s u n . r e f l e c t . D e l e g a t i n g M e t h o d A c c e s s o r I m p l . i n v o k e ( D e l e g a t i n g M e t h o d A c c e s s o r I m p l . j a v a : 43 ) j a v a . l a n g . r e f l e c t . M e t h o d . i n v o k e ( M e t h o d . j a v a : 606 ) o r g . m y b a t i s . s p r i n g . S q l S e s s i o n T e m p l a t e Proxy23.query(Unknown Source) org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:148) org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:141) org.apache.ibatis.session.defaults.DefaultSqlSession.selectOne(DefaultSqlSession.java:77) sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) java.lang.reflect.Method.invoke(Method.java:606) org.mybatis.spring.SqlSessionTemplate Proxy23.query(UnknownSource)org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:148)org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:141)org.apache.ibatis.session.defaults.DefaultSqlSession.selectOne(DefaultSqlSession.java:77)sun.reflect.NativeMethodAccessorImpl.invoke0(NativeMethod)sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)java.lang.reflect.Method.invoke(Method.java:606)org.mybatis.spring.SqlSessionTemplateSqlSessionInterceptor.invoke(SqlSessionTemplate.java:434)
com.sun.proxy. P r o x y 17. s e l e c t O n e ( U n k n o w n S o u r c e ) o r g . m y b a t i s . s p r i n g . S q l S e s s i o n T e m p l a t e . s e l e c t O n e ( S q l S e s s i o n T e m p l a t e . j a v a : 167 ) o r g . a p a c h e . i b a t i s . b i n d i n g . M a p p e r M e t h o d . e x e c u t e ( M a p p e r M e t h o d . j a v a : 82 ) o r g . a p a c h e . i b a t i s . b i n d i n g . M a p p e r P r o x y . i n v o k e ( M a p p e r P r o x y . j a v a : 53 ) c o m . s u n . p r o x y . Proxy17.selectOne(Unknown Source) org.mybatis.spring.SqlSessionTemplate.selectOne(SqlSessionTemplate.java:167) org.apache.ibatis.binding.MapperMethod.execute(MapperMethod.java:82) org.apache.ibatis.binding.MapperProxy.invoke(MapperProxy.java:53) com.sun.proxy. Proxy17.selectOne(UnknownSource)org.mybatis.spring.SqlSessionTemplate.selectOne(SqlSessionTemplate.java:167)org.apache.ibatis.binding.MapperMethod.execute(MapperMethod.java:82)org.apache.ibatis.binding.MapperProxy.invoke(MapperProxy.java:53)com.sun.proxy.Proxy18.checkUsername(Unknown Source)
com.mmall.service.impl.UserServiceImpl.login(UserServiceImpl.java:19)
com.mmall.controller.portal.UserController.login(UserController.java:25)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
java.lang.reflect.Method.invoke(Method.java:606)
org.springframework.web.method.support.InvocableHandlerMethod.invoke(InvocableHandlerMethod.java:214)
org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:132)
org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:104)
org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:748)
org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:689)
org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:83)
org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:945)
org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:876)
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:931)
org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:833)
javax.servlet.http.HttpServlet.service(HttpServlet.java:650)
org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:807)
javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:108)
root cause
com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Data source rejected establishment of connection, message from server: “Too many connections”
sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
java.lang.reflect.Constructor.newInstance(Constructor.java:526)
com.mysql.jdbc.Util.handleNewInstance(Util.java:406)
com.mysql.jdbc.Util.getInstance(Util.java:381)
com.mysql.jdbc.SQLError.createSQLException(SQLError.java:984)
com.mysql.jdbc.SQLError.createSQLException(SQLError.java:956)
com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:1095)
com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2031)
com.mysql.jdbc.ConnectionImpl.(ConnectionImpl.java:718)
com.mysql.jdbc.JDBC4Connection.(JDBC4Connection.java:46)
sun.reflect.GeneratedConstructorAccessor22.newInstance(Unknown Source)
sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
java.lang.reflect.Constructor.newInstance(Constructor.java:526)
com.mysql.jdbc.Util.handleNewInstance(Util.java:406)
com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:302)
com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:282)
org.apache.commons.dbcp.DriverConnectionFactory.createConnection(DriverConnectionFactory.java:38)
org.apache.commons.dbcp.PoolableConnectionFactory.makeObject(PoolableConnectionFactory.java:582)
org.apache.commons.pool.impl.GenericObjectPool.addObject(GenericObjectPool.java:1617)
org.apache.commons.dbcp.BasicDataSource.createDataSource(BasicDataSource.java:1395)
org.apache.commons.dbcp.BasicDataSource.getConnection(BasicDataSource.java:1044)
org.springframework.jdbc.datasource.DataSourceUtils.doGetConnection(DataSourceUtils.java:111)
org.springframework.jdbc.datasource.DataSourceUtils.getConnection(DataSourceUtils.java:77)
org.mybatis.spring.transaction.SpringManagedTransaction.openConnection(SpringManagedTransaction.java:84)
org.mybatis.spring.transaction.SpringManagedTransaction.getConnection(SpringManagedTransaction.java:70)
org.apache.ibatis.executor.BaseExecutor.getConnection(BaseExecutor.java:336)
org.apache.ibatis.executor.SimpleExecutor.prepareStatement(SimpleExecutor.java:84)
org.apache.ibatis.executor.SimpleExecutor.doQuery(SimpleExecutor.java:62)
org.apache.ibatis.executor.BaseExecutor.queryFromDatabase(BaseExecutor.java:324)
org.apache.ibatis.executor.BaseExecutor.query(BaseExecutor.java:156)
org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:109)
org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:83)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
java.lang.reflect.Method.invoke(Method.java:606)
org.apache.ibatis.plugin.Invocation.proceed(Invocation.java:49)
com.github.pagehelper.SqlUtil._processPage(SqlUtil.java:401)
com.github.pagehelper.SqlUtil.processPage(SqlUtil.java:374)
com.github.pagehelper.PageHelper.intercept(PageHelper.java:250)
org.apache.ibatis.plugin.Plugin.invoke(Plugin.java:61)
com.sun.proxy. P r o x y 23. q u e r y ( U n k n o w n S o u r c e ) o r g . a p a c h e . i b a t i s . s e s s i o n . d e f a u l t s . D e f a u l t S q l S e s s i o n . s e l e c t L i s t ( D e f a u l t S q l S e s s i o n . j a v a : 148 ) o r g . a p a c h e . i b a t i s . s e s s i o n . d e f a u l t s . D e f a u l t S q l S e s s i o n . s e l e c t L i s t ( D e f a u l t S q l S e s s i o n . j a v a : 141 ) o r g . a p a c h e . i b a t i s . s e s s i o n . d e f a u l t s . D e f a u l t S q l S e s s i o n . s e l e c t O n e ( D e f a u l t S q l S e s s i o n . j a v a : 77 ) s u n . r e f l e c t . N a t i v e M e t h o d A c c e s s o r I m p l . i n v o k e 0 ( N a t i v e M e t h o d ) s u n . r e f l e c t . N a t i v e M e t h o d A c c e s s o r I m p l . i n v o k e ( N a t i v e M e t h o d A c c e s s o r I m p l . j a v a : 57 ) s u n . r e f l e c t . D e l e g a t i n g M e t h o d A c c e s s o r I m p l . i n v o k e ( D e l e g a t i n g M e t h o d A c c e s s o r I m p l . j a v a : 43 ) j a v a . l a n g . r e f l e c t . M e t h o d . i n v o k e ( M e t h o d . j a v a : 606 ) o r g . m y b a t i s . s p r i n g . S q l S e s s i o n T e m p l a t e Proxy23.query(Unknown Source) org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:148) org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:141) org.apache.ibatis.session.defaults.DefaultSqlSession.selectOne(DefaultSqlSession.java:77) sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) java.lang.reflect.Method.invoke(Method.java:606) org.mybatis.spring.SqlSessionTemplate Proxy23.query(UnknownSource)org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:148)org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:141)org.apache.ibatis.session.defaults.DefaultSqlSession.selectOne(DefaultSqlSession.java:77)sun.reflect.NativeMethodAccessorImpl.invoke0(NativeMethod)sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)java.lang.reflect.Method.invoke(Method.java:606)org.mybatis.spring.SqlSessionTemplateSqlSessionInterceptor.invoke(SqlSessionTemplate.java:434)
com.sun.proxy. P r o x y 17. s e l e c t O n e ( U n k n o w n S o u r c e ) o r g . m y b a t i s . s p r i n g . S q l S e s s i o n T e m p l a t e . s e l e c t O n e ( S q l S e s s i o n T e m p l a t e . j a v a : 167 ) o r g . a p a c h e . i b a t i s . b i n d i n g . M a p p e r M e t h o d . e x e c u t e ( M a p p e r M e t h o d . j a v a : 82 ) o r g . a p a c h e . i b a t i s . b i n d i n g . M a p p e r P r o x y . i n v o k e ( M a p p e r P r o x y . j a v a : 53 ) c o m . s u n . p r o x y . Proxy17.selectOne(Unknown Source) org.mybatis.spring.SqlSessionTemplate.selectOne(SqlSessionTemplate.java:167) org.apache.ibatis.binding.MapperMethod.execute(MapperMethod.java:82) org.apache.ibatis.binding.MapperProxy.invoke(MapperProxy.java:53) com.sun.proxy. Proxy17.selectOne(UnknownSource)org.mybatis.spring.SqlSessionTemplate.selectOne(SqlSessionTemplate.java:167)org.apache.ibatis.binding.MapperMethod.execute(MapperMethod.java:82)org.apache.ibatis.binding.MapperProxy.invoke(MapperProxy.java:53)com.sun.proxy.Proxy18.checkUsername(Unknown Source)
com.mmall.service.impl.UserServiceImpl.login(UserServiceImpl.java:19)
com.mmall.controller.portal.UserController.login(UserController.java:25)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
java.lang.reflect.Method.invoke(Method.java:606)
org.springframework.web.method.support.InvocableHandlerMethod.invoke(InvocableHandlerMethod.java:214)
org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:132)
org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:104)
org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:748)
org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:689)
org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:83)
org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:945)
org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:876)
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:931)
org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:833)
javax.servlet.http.HttpServlet.service(HttpServlet.java:650)
org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:807)
javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:108)
note The full stack trace of the root cause is available in the Apache Tomcat/7.0.70 logs.
Apache Tomcat/7.0.70