问题记录——com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure...

梦里梦外; 2021-12-20 15:51 215阅读 0赞

最近在搞一个Spring boot + Mybatis + Mysql的项目，用Mybatis访问数据库时，报了如下的错误，先在网上搜索了，试了各种办法都不行，

奇葩的是，连接另外1个数据库又没问题。  最后发现是因为Mybatis的Mapper.xml文件中的SQL语句后面，多了个分号【;】，导致SQL查询要等待很久，直到返回下面的报错。

![1577453-20190416160837372-1653563516.png][]

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

The last packet successfully received from the server was 300,020 milliseconds ago. The last packet sent successfully to the server was 301,380 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:423)  
at com.mysql.jdbc.Util.handleNewInstance(Util.java:377)  
at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:1036)  
at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:3427)  
at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:3327)  
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3814)  
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:870)  
at com.mysql.jdbc.MysqlIO.readAllResults(MysqlIO.java:2274)  
at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2638)  
at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2530)  
at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:1907)  
at com.mysql.jdbc.PreparedStatement.execute(PreparedStatement.java:1199)  
at com.zaxxer.hikari.pool.ProxyPreparedStatement.execute(ProxyPreparedStatement.java:44)  
at com.zaxxer.hikari.pool.HikariProxyPreparedStatement.execute(HikariProxyPreparedStatement.java)  
at org.apache.ibatis.executor.statement.PreparedStatementHandler.query(PreparedStatementHandler.java:63)  
at org.apache.ibatis.executor.statement.RoutingStatementHandler.query(RoutingStatementHandler.java:79)  
at org.apache.ibatis.executor.SimpleExecutor.doQuery(SimpleExecutor.java:63)  
at org.apache.ibatis.executor.BaseExecutor.queryFromDatabase(BaseExecutor.java:324)  
at org.apache.ibatis.executor.BaseExecutor.query(BaseExecutor.java:156)  
at org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:109)  
at org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:83)  
at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:148)  
at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:141)  
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:498)  
at org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:433)  
at com.sun.proxy.$Proxy81.selectList(Unknown Source)  
at org.mybatis.spring.SqlSessionTemplate.selectList(SqlSessionTemplate.java:230)  
at org.apache.ibatis.binding.MapperMethod.executeForMany(MapperMethod.java:137)  
at org.apache.ibatis.binding.MapperMethod.execute(MapperMethod.java:75)  
at org.apache.ibatis.binding.MapperProxy.invoke(MapperProxy.java:59)  
at com.sun.proxy.$Proxy82.queryTransactionFileData(Unknown Source)  
at com.xxxxx.alipaygndemo.service.impl.AlipayGNDemoServiceImpl.buildTransactionFile(AlipayGNDemoServiceImpl.java:86)  
at com.xxxxx.alipaygndemo.controller.AlipayGNDemoController.buildTransactionFile(AlipayGNDemoController.java:135)  
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:498)  
at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:209)  
at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:136)  
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:102)  
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:891)  
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:797)  
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87)  
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:991)  
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:925)  
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:974)  
at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:877)  
at javax.servlet.http.HttpServlet.service(HttpServlet.java:661)  
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:851)  
at javax.servlet.http.HttpServlet.service(HttpServlet.java:742)  
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)  
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)  
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)  
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)  
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)  
at org.springframework.boot.actuate.web.trace.servlet.HttpTraceFilter.doFilterInternal(HttpTraceFilter.java:90)  
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)  
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)  
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)  
at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:99)  
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)  
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)  
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)  
at org.springframework.web.filter.HttpPutFormContentFilter.doFilterInternal(HttpPutFormContentFilter.java:109)  
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)  
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)  
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)  
at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:93)  
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)  
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)  
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)  
at org.springframework.boot.actuate.metrics.web.servlet.WebMvcMetricsFilter.filterAndRecordMetrics(WebMvcMetricsFilter.java:155)  
at org.springframework.boot.actuate.metrics.web.servlet.WebMvcMetricsFilter.filterAndRecordMetrics(WebMvcMetricsFilter.java:123)  
at org.springframework.boot.actuate.metrics.web.servlet.WebMvcMetricsFilter.doFilterInternal(WebMvcMetricsFilter.java:108)  
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)  
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)  
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)  
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:200)  
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)  
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)  
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)  
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:198)  
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)  
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:493)  
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140)  
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81)  
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)  
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342)  
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:800)  
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)  
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:806)  
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1498)  
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)  
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)  
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)  
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)  
at java.lang.Thread.run(Thread.java:748)  
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:2914)  
at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:3337)  
... 96 common frames omitted

转载于:https://www.cnblogs.com/caoweixiong/p/10717883.html

[1577453-20190416160837372-1653563516.png]: /images/20211220/84d0813204de49d8893c86835f3a102d.png