急急急，为什么查询数据的时候老是报这个错误，点第二...

sykt

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

The last packet successfully received from the server was 519,685 milliseconds ago.  The last packet sent successfully to the server was 0 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:400)
        at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:1038)
        at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:3434)
        at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:3334)
        at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3774)
        at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2447)
        at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2594)
        at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2545)
        at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:1901)
        at com.mysql.jdbc.PreparedStatement.executeQuery(PreparedStatement.java:2002)
        at org.apache.tomcat.dbcp.dbcp.DelegatingPreparedStatement.executeQuery(DelegatingPreparedStatement.java:96)
        at org.apache.tomcat.dbcp.dbcp.DelegatingPreparedStatement.executeQuery(DelegatingPreparedStatement.java:96)
        at vpp.User.checkMobile(User.java:179)
        at vpp.User__do.checkMobile(User__do.java:107)
        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.justep.baas.action.Engine.execAction(Unknown Source)
        at com.justep.baas.action.Engine.execAction(Unknown Source)
        at com.justep.baas.servlet.BaasServlet.execService(Unknown Source)
        at com.justep.baas.servlet.BaasServlet.service(Unknown Source)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293)
        at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:861)
        at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:606)
        at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
        at java.lang.Thread.run(Thread.java:745)
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:2926)
        at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:3344)
        ... 31 more
2017-11-02 10:56:53 Action[vpp/user/checkMobile]执行失败，Already closed.
java.lang.reflect.InvocationTargetException
        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.justep.baas.action.Engine.execAction(Unknown Source)
        at com.justep.baas.action.Engine.execAction(Unknown Source)
        at com.justep.baas.servlet.BaasServlet.execService(Unknown Source)
        at com.justep.baas.servlet.BaasServlet.service(Unknown Source)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293)
        at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:861)
        at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:606)
        at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
        at java.lang.Thread.run(Thread.java:745)
Caused by: java.sql.SQLException: Already closed.
        at org.apache.tomcat.dbcp.dbcp.PoolableConnection.close(PoolableConnection.java:114)
        at org.apache.tomcat.dbcp.dbcp.PoolingDataSource$PoolGuardConnectionWrapper.close(PoolingDataSource.java:191)
        at com.justep.baas.action.ActionContext$CoreConnection.forcedClose(Unknown Source)
        at com.justep.baas.action.ActionContext$CoreConnection.close(Unknown Source)
        at com.justep.baas.action.ActionContext$ActionContextConnection.close(Unknown Source)
        at vpp.User.checkMobile(User.java:193)
        at vpp.User__do.checkMobile(User__do.java:107)
        ... 20 more
com.justep.baas.action.ActionException: Action[vpp/user/checkMobile]执行失败，Already closed.
        at com.justep.baas.action.Engine.execAction(Unknown Source)
        at com.justep.baas.action.Engine.execAction(Unknown Source)
        at com.justep.baas.servlet.BaasServlet.execService(Unknown Source)
        at com.justep.baas.servlet.BaasServlet.service(Unknown Source)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293)
        at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:861)
        at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:606)
        at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
        at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.reflect.InvocationTargetException
        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)
        ... 16 more
Caused by: java.sql.SQLException: Already closed.
        at org.apache.tomcat.dbcp.dbcp.PoolableConnection.close(PoolableConnection.java:114)
        at org.apache.tomcat.dbcp.dbcp.PoolingDataSource$PoolGuardConnectionWrapper.close(PoolingDataSource.java:191)
        at com.justep.baas.action.ActionContext$CoreConnection.forcedClose(Unknown Source)
        at com.justep.baas.action.ActionContext$CoreConnection.close(Unknown Source)
        at com.justep.baas.action.ActionContext$ActionContextConnection.close(Unknown Source)
        at vpp.User.checkMobile(User.java:193)
        at vpp.User__do.checkMobile(User__do.java:107)
        ... 20 more
十一月 02, 2017 10:56:53 上午 org.apache.catalina.core.StandardWrapperValve invoke
严重: Servlet.service() for servlet WeX5_Baas_Servlet threw exception
java.sql.SQLException: Already closed.
        at org.apache.tomcat.dbcp.dbcp.PoolableConnection.close(PoolableConnection.java:114)
        at org.apache.tomcat.dbcp.dbcp.PoolingDataSource$PoolGuardConnectionWrapper.close(PoolingDataSource.java:191)
        at com.justep.baas.action.ActionContext$CoreConnection.forcedClose(Unknown Source)
        at com.justep.baas.action.ActionContext$CoreConnection.close(Unknown Source)
        at com.justep.baas.action.ActionContext$ActionContextConnection.close(Unknown Source)
        at vpp.User.checkMobile(User.java:193)
        at vpp.User__do.checkMobile(User__do.java:107)
        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.justep.baas.action.Engine.execAction(Unknown Source)
        at com.justep.baas.action.Engine.execAction(Unknown Source)
        at com.justep.baas.servlet.BaasServlet.execService(Unknown Source)
        at com.justep.baas.servlet.BaasServlet.service(Unknown Source)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)

liangyongfei

http://docs.wex5.com/wex5-server-question-list-2004/

sykt

问题已解决，可结帖

dzq

sykt 发表于 2017-11-2 14:00
问题已解决，可结帖

您好，我也遇到了您这个问题，你是怎么解决的了？给兄弟说说呗，万分感谢