change_flight menu action fails with null pointer exception

Hi everybody,

we are facing issues with null pointer exceptions as a result of change_flight menu action execution.

We have had this thrice now.
Two times out of this, we most likely had issues with incorrectly performed bounces of OTM web and app server.
The third time, this cause can be disregarded with a high possibility.

A bounce of web and app server resolves the issue. Still we have not come close to identifying the actual reason for it.

The question is if anybody has come across this kind of error before and has an idea how to resolve it?

We are running on OTM 6.2.9.


The exact error looks like this:
java.lang.NullPointerException
at glog.util.jdbc.noserver.T2SharedConnection.close(T 2SharedConnection.java:61)
at glog.business.location.TLocation.load(TLocation.ja va:777)
at glog.business.location.TLocation.getInstance(TLoca tion.java:740)
at glog.business.airschedule.TFlightInstance.getSrcLo cationTimeZoneGid(TFlightInstance.java:498)
at glog.webserver.uic.GetFlightList.flightInfo(GetFli ghtList.java:147)
at glog.webserver.uic.GetFlightList.getDocument(GetFl ightList.java:81)
at glog.webserver.util.QueryResponseServlet.getDocume nt(QueryResponseServlet.java:293)
at glog.webserver.util.AbstractServletProducer.proces s(AbstractServletProducer.java:75)
at glog.webserver.util.BaseServlet.service(BaseServle t.java:970)
at javax.servlet.http.HttpServlet.service(HttpServlet .java:717)
at org.apache.catalina.core.ApplicationFilterChain.in ternalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.do Filter(ApplicationFilterChain.java:206)
at glog.webserver.screenlayout.FrameInterceptFilter.d oFilter(FrameInterceptFilter.java:29)
at org.apache.catalina.core.ApplicationFilterChain.in ternalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.do Filter(ApplicationFilterChain.java:206)
at glog.webserver.session.ParameterValidation.doFilte r(ParameterValidation.java:29)
at org.apache.catalina.core.ApplicationFilterChain.in ternalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.do Filter(ApplicationFilterChain.java:206)
at glog.webserver.screenlayout.ClientSessionTracker.d oFilter(ClientSessionTracker.java:72)
at org.apache.catalina.core.ApplicationFilterChain.in ternalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.do Filter(ApplicationFilterChain.java:206)
at glog.webserver.util.SetCharacterEncodingFilter.doF ilter(SetCharacterEncodingFilter.java:44)
at org.apache.catalina.core.ApplicationFilterChain.in ternalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.do Filter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invo ke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invo ke(StandardContextValve.java:191)
at org.apache.catalina.core.StandardHostValve.invoke( StandardHostValve.java:128)
at org.apache.catalina.valves.ErrorReportValve.invoke (ErrorReportValve.java:102)
at org.apache.catalina.core.StandardEngineValve.invok e(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.servic e(CoyoteAdapter.java:286)
at org.apache.jk.server.JkCoyoteHandler.invoke(JkCoyo teHandler.java:190)
at org.apache.jk.common.HandlerRequest.invoke(Handler Request.java:283)
at org.apache.jk.common.ChannelSocket.invoke(ChannelS ocket.java:767)
at org.apache.jk.common.ChannelSocket.processConnecti on(ChannelSocket.java:697)
at org.apache.jk.common.ChannelSocket$SocketConnectio n.runIt(ChannelSocket.java:889)
at org.apache.tomcat.util.threads.ThreadPool$ControlR unnable.run(ThreadPool.java:690)
at java.lang.Thread.run(Thread.java:619)