在我的webapp上，我经常会得到以下异常： java.sql.SQLNonTransientConnectionException：无法发送查询：最后一个数据包未完成 它通常会在很长一段时间后发生系统空闲。 重启tomcat可以暂时解决问题。MariaDB空闲一段时间后无法工作
我最近在我的生产服务器上运行了RHEL7（运行tomcat7和mariaDB 5.5）。 旧的服务器上没有发生这个错误（使用mySQL运行RHEL5）。 我更新了从旧服务器上使用的mysql驱动程序到最新的稳定mariadb连接器的java数据库驱动程序：mariadb-java-client-1.1.7.jar。
任何想法如何解决问题或解决方法？
以下是完整的日志中的异常：
Lexicon Message: Content.getData Error trying to excute: SELECT * FROM prefixes where prefix ='l' java.sql.SQLNonTransientConnectionException: Could not send query: Last packet not finished at org.mariadb.jdbc.internal.SQLExceptionMapper.get(SQLExceptionMapper.java:136) at org.mariadb.jdbc.internal.SQLExceptionMapper.throwException(SQLExceptionMapper.java:106) at org.mariadb.jdbc.MySQLStatement.executeQueryEpilog(MySQLStatement.java:264) at org.mariadb.jdbc.MySQLStatement.execute(MySQLStatement.java:288) at org.mariadb.jdbc.MySQLStatement.execute(MySQLStatement.java:338) at snaq.db.CachedStatement.execute(CachedStatement.java:339) at mila.lexicon.dbUtils.Connected.getData(Connected.java:257) at mila.lexicon.dbUtils.Prefixes.get(Prefixes.java:29) at mila.lexicon.analyse.Data.getPrefixes(Data.java:446) at mila.HMM.HMM2Morph.handlePrefixProperNameAnalysis(HMM2Morph.java:1196) at mila.HMM.HMM2Morph.parseXML(HMM2Morph.java:1791) at mila.HMM.HMM2Morph.process(HMM2Morph.java:2337) at org.apache.jsp.processAnalyzerXML_jsp._jspService(processAnalyzerXML_jsp.java:187) at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70) at javax.servlet.http.HttpServlet.service(HttpServlet.java:728) at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:432) at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390) at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334) at javax.servlet.http.HttpServlet.service(HttpServlet.java:728) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99) at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408) at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1024) at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589) at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:310) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) at java.lang.Thread.run(Thread.java:745) Caused by: org.mariadb.jdbc.internal.common.QueryException: Could not send query: Last packet not finished at org.mariadb.jdbc.internal.mysql.MySQLProtocol.executeQuery(MySQLProtocol.java:984) at org.mariadb.jdbc.MySQLStatement.execute(MySQLStatement.java:281) ... 31 more Caused by: java.io.IOException: Last packet not finished at org.mariadb.jdbc.internal.common.packet.PacketOutputStream.startPacket(PacketOutputStream.java:38) at org.mariadb.jdbc.internal.common.packet.commands.StreamedQueryPacket.send(StreamedQueryPacket.java:76) at org.mariadb.jdbc.internal.mysql.MySQLProtocol.executeQuery(MySQLProtocol.java:982) ... 32 more
听起来像是你连接池不发送次数不够保活消息 – Ordous 2014-11-05 12:34:17
你是怎么解决这个问题的？当我们迁移到DPCP时，我们遇到了完全相同的问题。 – proulxs 2015-04-02 12:35:22
我不记得确切。我提出了服务器上的超时或将客户端上的超时时间设置为比服务器上的超时时间短。目前thr java应用程序中的超时值为18000. – Slava 2015-04-04 08:52:33