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 com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Data source rejected establishment of connection, message from server: "Too many connections" ### The error may exist in file [D:\Tomcat8089\webapps\mnsfdxhxhg\WEB-INF\classes\com\obe\webobe\dao\mapping\SysparamMapper.xml] ### The error may involve com.obe.webobe.dao.SysparamMapper.selectByParam ### The error occurred while executing a query ### Cause: org.springframework.jdbc.CannotGetJdbcConnectionException: Could not get JDBC Connection; nested exception is com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Data source rejected establishment of connection, message from server: "Too many connections"

org.mybatis.spring.MyBatisExceptionTranslator.translateExceptionIfPossible(MyBatisExceptionTranslator.java:75)

org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:371)

com.sun.proxy.$Proxy996.selectOne(Unknown Source)

org.mybatis.spring.SqlSessionTemplate.selectOne(SqlSessionTemplate.java:163)

org.apache.ibatis.binding.MapperMethod.execute(MapperMethod.java:69)

org.apache.ibatis.binding.MapperProxy.invoke(MapperProxy.java:53)

com.sun.proxy.$Proxy1060.selectByParam(Unknown Source)

com.obe.webobe.service.impl.SysparamServiceImpl.getSysparamByParam(SysparamServiceImpl.java:20)

com.obe.webobe.service.impl.SysparamServiceImpl.getValue(SysparamServiceImpl.java:24)

com.obe.webobe.service.impl.SysparamServiceImpl$$FastClassBySpringCGLIB$$9a3a9987.invoke()

org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:204)

org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:717)

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

org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:99)

org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:281)

org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:96)

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

org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:92)

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

org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:653)

com.obe.webobe.service.impl.SysparamServiceImpl$$EnhancerBySpringCGLIB$$d6fd0138.getValue()

com.obe.web.LoginDo.loginjsp(LoginDo.java:199)

sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)

sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)

java.lang.reflect.Method.invoke(Unknown Source)

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:776)

org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:705)

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

org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:959)

org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:893)

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:634)

org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:842)

javax.servlet.http.HttpServlet.service(HttpServlet.java:741)

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

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

org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)

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

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

com.alibaba.druid.support.http.WebStatFilter.doFilter(WebStatFilter.java:123)

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

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

org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:85)

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

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

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

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

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

org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)

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

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

org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:651)

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

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

org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:417)

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

org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:754)

org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1376)

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

java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)

java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)

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

java.lang.Thread.run(Unknown Source)