在我的网络应用程序上，我经常遇到以下异常：
java.sql.SQLNonTransientConnectionException：无法发送查询：最后一个数据包未完成
它通常发生在系统长时间闲置之后。
重新启动 tomcat 可以暂时解决该问题。
我最近在生产服务器上迁移到了 RHEL7（运行 tomcat7 和 mariaDB 5.5）。
这个错误并没有发生在旧服务器上（使用 mySQL 运行 RHEL5）。
我将旧服务器上使用的 mysql 驱动程序的 java 数据库驱动程序更新为最新的稳定 mariadb 连接器：mariadb-java-client-1.1.7.jar。
有什么想法可以解决问题或解决方法吗？
这是此异常的完整日志：
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
我们没有足够的信息，但我在 mysql 服务器上遇到了类似的问题。更改超时设置后问题得到解决my.cnf
wait_timeout = 28800
interactive_timeout = 28800
28800 秒 - 8 小时
重新启动服务器以应用更改
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