jfinal中myslq异常Communications link failure

l2qq · 2019-10-16 10:57

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报错内容信息：

com.jfinal.plugin.activerecord.ActiveRecordException: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure

The last packet successfully received from the server was 7,711 milliseconds ago.  The last packet sent successfully to the server was 1 milliseconds ago.
	at com.jfinal.plugin.activerecord.Model.find(Model.java:586)
	at com.jfinal.plugin.activerecord.Model.find(Model.java:596)
	at com.seo.controller.AdminController.adminUser(AdminController.java:28)
	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:497)
	at com.jfinal.aop.Invocation.invoke(Invocation.java:73)
	at com.seo.intercepter.StoreInterceptor.intercept(StoreInterceptor.java:20)
	at com.jfinal.aop.Invocation.invoke(Invocation.java:67)
	at com.seo.intercepter.LoginSessionInterceptor.intercept(LoginSessionInterceptor.java:51)
	at com.jfinal.aop.Invocation.invoke(Invocation.java:67)
	at com.jfinal.core.ActionHandler.handle(ActionHandler.java:83)
	at com.seo.silian.SilianHandler.handle(SilianHandler.java:34)
	at com.seo.silian.SilianHandler.handle(SilianHandler.java:34)
	at com.jfinal.ext.handler.FakeStaticHandler.handle(FakeStaticHandler.java:58)
	at com.seo.silian.SilianHandler.handle(SilianHandler.java:34)
	at com.jfinal.core.JFinalFilter.doFilter(JFinalFilter.java:73)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:505)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:169)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
	at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:956)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:436)
	at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1078)
	at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:625)
	at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:316)
	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:745)
Caused by: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure

The last packet successfully received from the server was 7,711 milliseconds ago.  The last packet sent successfully to the server was 1 milliseconds ago.
	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
	at java.lang.reflect.Constructor.newInstance(Constructor.java:422)
	at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
	at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:1116)
	at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:3589)
	at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:3478)
	at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4019)
	at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2490)
	at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2651)
	at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2683)
	at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:2144)
	at com.mysql.jdbc.PreparedStatement.executeQuery(PreparedStatement.java:2310)
	at com.alibaba.druid.pool.DruidPooledPreparedStatement.executeQuery(DruidPooledPreparedStatement.java:228)
	at com.jfinal.plugin.activerecord.Model.find(Model.java:567)
	at com.jfinal.plugin.activerecord.Model.find(Model.java:584)
	... 34 more
Caused by: java.io.EOFException: Can not read response from server. Expected to read 4 bytes, read 0 bytes before connection was unexpectedly lost.
	at com.mysql.jdbc.MysqlIO.readFully(MysqlIO.java:3039)
	at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:3489)
	... 44 more

解决办法：

mysql 8小时超时设置

1、打开MySQL配置文件

2、添加

interactive_timeout=31536000

wait_timeout=31536000

3、重新启动服务

打开MySQL命令行界面查看设置是否成功