java EE 网站如果第一次打开都500错误，刷新一下就好了，不知道为什么 报错

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java EE 网站如果第一次打开都500错误，刷新一下就好了，不知道为什么

HTTP Status 500 - Request processing failed; nested exception is org.springframework.dao.RecoverableDataAccessException: PreparedStatementCallback; SQL [SELECT * FROM dt_pin WHERE deleting = 0 AND is_private = 0 AND pin_id < ? ORDER BY pin_id DESC LIMIT ?]; Communications link failure

type Exception report

message Request processing failed; nested exception is org.springframework.dao.RecoverableDataAccessException: PreparedStatementCallback; SQL [SELECT * FROM dt_pin WHERE deleting = 0 AND is_private = 0 AND pin_id < ? ORDER BY pin_id DESC LIMIT ?]; Communications link failure

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.springframework.dao.RecoverableDataAccessException: PreparedStatementCallback; SQL [SELECT * FROM dt_pin WHERE deleting = 0 AND is_private = 0 AND pin_id < ? ORDER BY pin_id DESC LIMIT ?]; Communications link failure

The last packet successfully received from the server was 33,234,866 milliseconds ago. The last packet sent successfully to the server was 3 milliseconds ago.; nested exception is com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure

The last packet successfully received from the server was 33,234,866 milliseconds ago. The last packet sent successfully to the server was 3 milliseconds ago. org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:982) org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:861) javax.servlet.http.HttpServlet.service(HttpServlet.java:622) org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846) javax.servlet.http.HttpServlet.service(HttpServlet.java:729) org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:77) org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:121) org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) root cause

org.springframework.dao.RecoverableDataAccessException: PreparedStatementCallback; SQL [SELECT * FROM dt_pin WHERE deleting = 0 AND is_private = 0 AND pin_id < ? ORDER BY pin_id DESC LIMIT ?]; Communications link failure

The last packet successfully received from the server was 33,234,866 milliseconds ago. The last packet sent successfully to the server was 3 milliseconds ago.; nested exception is com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure

The last packet successfully received from the server was 33,234,866 milliseconds ago. The last packet sent successfully to the server was 3 milliseconds ago. org.springframework.jdbc.support.SQLExceptionSubclassTranslator.doTranslate(SQLExceptionSubclassTranslator.java:98) org.springframework.jdbc.support.AbstractFallbackSQLExceptionTranslator.translate(AbstractFallbackSQLExceptionTranslator.java:73) org.springframework.jdbc.support.AbstractFallbackSQLExceptionTranslator.translate(AbstractFallbackSQLExceptionTranslator.java:81) org.springframework.jdbc.core.JdbcTemplate.execute(JdbcTemplate.java:645) org.springframework.jdbc.core.JdbcTemplate.query(JdbcTemplate.java:680) org.springframework.jdbc.core.JdbcTemplate.query(JdbcTemplate.java:712) org.springframework.jdbc.core.JdbcTemplate.query(JdbcTemplate.java:722) org.springframework.jdbc.core.JdbcTemplate.query(JdbcTemplate.java:777) com.zhongshanwang.dao.impl.PinDaoImpl.getPinsByMax(PinDaoImpl.java:115) com.zhongshanwang.service.impl.PinServiceImpl.getPinsByMax(PinServiceImpl.java:190) com.zhongshanwang.service.impl.PinServiceImpl.pageAll(PinServiceImpl.java:901) sun.reflect.GeneratedMethodAccessor1467.invoke(Unknown Source) sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) java.lang.reflect.Method.invoke(Method.java:497) org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:302) org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:202) com.sun.proxy.$Proxy20.pageAll(Unknown Source) com.zhongshanwang.controller.AllController.all(AllController.java:67) 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:497) org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:222) 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.invokeHandlerMethod(RequestMappingHandlerAdapter.java:814) org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:737) 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:970) org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:861) javax.servlet.http.HttpServlet.service(HttpServlet.java:622) org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846) javax.servlet.http.HttpServlet.service(HttpServlet.java:729) org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:77) org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:121) org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) root cause

com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure

The last packet successfully received from the server was 33,234,866 milliseconds ago. The last packet sent successfully to the server was 3 milliseconds ago. sun.reflect.GeneratedConstructorAccessor433.newInstance(Unknown Source) sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) java.lang.reflect.Constructor.newInstance(Constructor.java:422) com.mysql.jdbc.Util.handleNewInstance(Util.java:404) com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:983) com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:3457) com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:3357) com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3797) com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2470) com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2617) com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2550) com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:1861) com.mysql.jdbc.PreparedStatement.executeQuery(PreparedStatement.java:1962) com.mchange.v2.c3p0.impl.NewProxyPreparedStatement.executeQuery(NewProxyPreparedStatement.java:379) org.springframework.jdbc.core.JdbcTemplate$1.doInPreparedStatement(JdbcTemplate.java:688) org.springframework.jdbc.core.JdbcTemplate.execute(JdbcTemplate.java:629) org.springframework.jdbc.core.JdbcTemplate.query(JdbcTemplate.java:680) org.springframework.jdbc.core.JdbcTemplate.query(JdbcTemplate.java:712) org.springframework.jdbc.core.JdbcTemplate.query(JdbcTemplate.java:722) org.springframework.jdbc.core.JdbcTemplate.query(JdbcTemplate.java:777) com.zhongshanwang.dao.impl.PinDaoImpl.getPinsByMax(PinDaoImpl.java:115) com.zhongshanwang.service.impl.PinServiceImpl.getPinsByMax(PinServiceImpl.java:190) com.zhongshanwang.service.impl.PinServiceImpl.pageAll(PinServiceImpl.java:901) sun.reflect.GeneratedMethodAccessor1467.invoke(Unknown Source) sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) java.lang.reflect.Method.invoke(Method.java:497) org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:302) org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:202) com.sun.proxy.$Proxy20.pageAll(Unknown Source) com.zhongshanwang.controller.AllController.all(AllController.java:67) 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:497) org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:222) 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.invokeHandlerMethod(RequestMappingHandlerAdapter.java:814) org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:737) 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:970) org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:861) javax.servlet.http.HttpServlet.service(HttpServlet.java:622) org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846) javax.servlet.http.HttpServlet.service(HttpServlet.java:729) org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:77) org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:121) org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) root cause

java.io.EOFException: Can not read response from server. Expected to read 4 bytes, read 0 bytes before connection was unexpectedly lost. com.mysql.jdbc.MysqlIO.readFully(MysqlIO.java:2949) com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:3367) com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:3357) com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3797) com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2470) com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2617) com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2550) com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:1861) com.mysql.jdbc.PreparedStatement.executeQuery(PreparedStatement.java:1962) com.mchange.v2.c3p0.impl.NewProxyPreparedStatement.executeQuery(NewProxyPreparedStatement.java:379) org.springframework.jdbc.core.JdbcTemplate$1.doInPreparedStatement(JdbcTemplate.java:688) org.springframework.jdbc.core.JdbcTemplate.execute(JdbcTemplate.java:629) org.springframework.jdbc.core.JdbcTemplate.query(JdbcTemplate.java:680) org.springframework.jdbc.core.JdbcTemplate.query(JdbcTemplate.java:712) org.springframework.jdbc.core.JdbcTemplate.query(JdbcTemplate.java:722) org.springframework.jdbc.core.JdbcTemplate.query(JdbcTemplate.java:777) com.zhongshanwang.dao.impl.PinDaoImpl.getPinsByMax(PinDaoImpl.java:115) com.zhongshanwang.service.impl.PinServiceImpl.getPinsByMax(PinServiceImpl.java:190) com.zhongshanwang.service.impl.PinServiceImpl.pageAll(PinServiceImpl.java:901) sun.reflect.GeneratedMethodAccessor1467.invoke(Unknown Source) sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) java.lang.reflect.Method.invoke(Method.java:497) org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:302) org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:202) com.sun.proxy.$Proxy20.pageAll(Unknown Source) com.zhongshanwang.controller.AllController.all(AllController.java:67) 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:497) org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:222) 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.invokeHandlerMethod(RequestMappingHandlerAdapter.java:814) org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:737) 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:970) org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:861) javax.servlet.http.HttpServlet.service(HttpServlet.java:622) org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846) javax.servlet.http.HttpServlet.service(HttpServlet.java:729) org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:77) org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:121) org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) note The full stack trace of the root cause is available in the Apache Tomcat/8.0.29 logs.

Apache Tomcat/8.0.29

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