关于mysql报 loopWaitCount 0, wait millis 60000 错误的解决办法

最近遇到个比较奇怪的问题,用户的网站百万级访问量,最近没有修改程序,也没有改过其他地方,最近总是运行20几个小时左右tomcat就假死一次,访问无响应!!经常过检查日志发现里面报了一个错误

com.alibaba.druid.pool.GetConnectionTimeoutException: loopWaitCount 0, wait millis 60000

at com.alibaba.druid.pool.DruidDataSource.pollLast(DruidDataSource.java:1076)

at com.alibaba.druid.pool.DruidDataSource.getConnectionInternal(DruidDataSource.java:756)

at com.alibaba.druid.pool.DruidDataSource.getConnectionDirect(DruidDataSource.java:644)

at com.alibaba.druid.filter.FilterChainImpl.dataSource_connect(FilterChainImpl.java:4530)

at com.alibaba.druid.filter.stat.StatFilter.dataSource_getConnection(StatFilter.java:659)

at com.alibaba.druid.filter.FilterChainImpl.dataSource_connect(FilterChainImpl.java:4526)

at com.alibaba.druid.pool.DruidDataSource.getConnection(DruidDataSource.java:626)

at com.alibaba.druid.pool.DruidDataSource.getConnection(DruidDataSource.java:618)

at com.sanyuan.dao.DBConnection.getConnection(DBConnection.java:267)

at com.sanyuan.dao.DBAccess.setPreparedSQL(DBAccess.java:65)

at com.clsoftware.sms.manager.SmsSenderLogManager.getTop1LogListByCondition(SmsSenderLogManager.java:641)

at org.apache.jsp.superadmin.sms.autoCheckInfor_jsp._jspService(autoCheckInfor_jsp.java:72)

at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)

at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)

at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:388)

at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313)

at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260)

at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)

at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)

at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)

at org.apache.struts2.dispatcher.FilterDispatcher.doFilter(FilterDispatcher.java:413)

at com.clsoftware.filter.MyFilterDispatcher.doFilter(MyFilterDispatcher.java:162)

at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)

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:102)

at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)

at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:291)

at org.apache.jk.server.JkCoyoteHandler.invoke(JkCoyoteHandler.java:190)

at org.apache.jk.common.HandlerRequest.invoke(HandlerRequest.java:291)

at org.apache.jk.common.ChannelSocket.invoke(ChannelSocket.java:776)

at org.apache.jk.common.ChannelSocket.processConnection(ChannelSocket.java:705)

at org.apache.jk.common.ChannelSocket$SocketConnection.runIt(ChannelSocket.java:898)

at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:690)

at java.lang.Thread.run(Thread.java:619)

loopWaitCount 0, wait millis 60000 一看字面意思就是数据库有问题了....找了N久才发现不是数据库的问题...

原来用户用了数据库连接池,由于我们的诶个虚拟主机都有数据库并发的限制,用户把数据库连接池最大连接数设置为50 , 造成了数据库连接池不够用,通知用户,增加数据库连接池后,重启tomcat恢复正常!!

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