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

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