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Re: [Wrapper-user] Non-console application shutdown
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From: Richard E. <rem...@ed...> - 2005-11-03 15:30:38
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This log is from a customer site. It is a machine that is dedicate to the application being controlled by the wrapper. That said, sysadmin or folks involved with application might be logging in/out, if not for anything else than making sure things are up and running or looking at the log files. I will have to see if I can get them to reproduce it problem (I will be trying to do so here). If they can, I will suggest putting the wrapper in debug mode. We've been wrapping the JBoss application here on linux, solaris and windows for over three years so the situation at the customer site is unexpected. Related question: recommendations of tools that wrap the wrapper; when the wrapper exits how does one notify support staff that the wrapper is down? Richard Leif Mortenson wrote: > Also what is happening while this is running? Are there user > accounts being logged in > and out? > > Cheers, > Leif > > Richard Emberson wrote: > >> The wrapper is being run as a service. >> >> The following is in the log file: >> >> INFO | jvm 5 | 2005/10/31 14:32:26 | [java] [Thr 4336] RFC >> Instrument: cosaccepttp reset uuid INFO | wrapper | >> 2005/10/31 14:37:19 | User logged out. Ignored. >> INFO | wrapper | 2005/10/31 14:37:19 | User logged out. Ignored. >> INFO | jvm 5 | 2005/10/31 14:37:20 | [java] Shutting down >> INFO | jvm 5 | 2005/10/31 14:37:20 | [java] Shutdown >> complete INFO | jvm 5 | 2005/10/31 14:37:20 | [java] >> Halting VM >> INFO | wrapper | 2005/10/31 14:37:20 | User logged out. >> Ignored. INFO | wrapper | 2005/10/31 14:37:20 | User >> logged out. Ignored. >> INFO | jvm 5 | 2005/10/31 14:38:23 >> | INFO | jvm 5 | 2005/10/31 >> 14:38:23 | BUILD SUCCESSFUL >> INFO | jvm 5 | 2005/10/31 14:38:23 | Total time: 5,938 minutes >> 26 seconds ERROR | wrapper | 2005/10/31 14:38:24 | JVM exited >> unexpectedly. >> STATUS | wrapper | 2005/10/31 14:40:01 | Launching a >> JVM... INFO | jvm 6 | 2005/10/31 14:40:02 | >> Wrapper (Version 3.1.2) http://wrapper.tanukisoftware.org >> INFO | jvm 6 | 2005/10/31 14:40:02 | The first line >> is normal output from the application. >> The lines containing: "Shutting down", "Shutdown complete" and >> "Halting VM" >> are all being printed in the JBoss Shutdown Hook. >> The timing of the entries I would assume imply that they are all >> related, related >> to the user logout event. Something called System.exit() in the JBoss >> process - >> something triggered by the logout event - but how can that be if the >> wrapper >> is handling the event (as a code walkthru seems to indicate). >> >> Richard >> Leif Mortenson wrote: >> >>> Richard, >>> The "User logged out. Ignored." Messages show up when the >>> Wrapper is being run as >>> a service and an actual user who is logged in logs out to the >>> Windows login screen. The >>> service stays running in the background. This message is there to >>> help record the timing >>> of that event. >>> The message is displayed in response to a LOGOUT signal being >>> received from the >>> OS. Some Windows versions sent multiple signals, thus the >>> duplicate messages. It >>> is nothing to worry about and unrelated to shutdown. >>> >>> In this case, is what is happening is that your JBoss application >>> is calling System.exit >>> as it shuts down. Normally, this would cause the Wrapper to exit >>> as the application >>> had completed normally. When System.exit is called, the Java >>> executes all registered >>> shutdown hooks. The Wrapper registers such a shutdown hook to >>> handle the smooth >>> shutdown of the JVM. >>> The problem is that in your case, you have specifically disabled >>> the shutdown hooks. >>> When this is done, the Wrapper's shutdown hook is not run and the >>> Wrapper process >>> has no way of telling if the JVM crashed or shutdown >>> intentionally. So it states that >>> fact, assumes a crash and restarts the JVM. >>> Take a look at this page: >>> http://wrapper.tanukisoftware.org/doc/english/prop-disable-shutdown-hook.html >>> >>> >>> From your last sentence, it sounds like you are not expecting the >>> Java application >>> to be exiting? But that conflicts with what I am seeing in the log >>> file? Are you asking >>> why JBoss is shutting down in the first place? >>> >>> If you rerun your application with wrapper.debug=true then I can >>> tell you exactly >>> what is initiating the JVM shutdown (If it is being done by the >>> Wrapper). But I am >>> pretty sure your app is calling System.exit. Just not sure what is >>> initiating that. >>> >>> Cheers, >>> Leif >>> >>> Richard Emberson wrote: >>> >>>> I have the following in a wrapper log: >>>> >>>> INFO | wrapper | 2005/10/31 14:37:19 | User logged out. Ignored. >>>> INFO | wrapper | 2005/10/31 14:37:19 | User logged out. >>>> Ignored. INFO | jvm 5 | 2005/10/31 14:37:20 | [java] >>>> Shutting down >>>> INFO | jvm 5 | 2005/10/31 14:37:20 | [java] Shutdown >>>> complete INFO | jvm 5 | 2005/10/31 14:37:20 | [java] >>>> Halting VM >>>> INFO | wrapper | 2005/10/31 14:37:20 | User logged out. >>>> Ignored. INFO | wrapper | 2005/10/31 14:37:20 | User >>>> logged out. Ignored. >>>> INFO | jvm 5 | 2005/10/31 14:38:23 >>>> | INFO | jvm 5 | 2005/10/31 >>>> 14:38:23 | BUILD SUCCESSFUL >>>> INFO | jvm 5 | 2005/10/31 14:38:23 | Total time: 5,938 minutes >>>> 26 >>>> seconds >>>> >>>> ERROR | wrapper | 2005/10/31 14:38:24 | JVM exited unexpectedly. >>>> STATUS | wrapper | 2005/10/31 14:40:01 | Launching a >>>> JVM... INFO | jvm 6 | 2005/10/31 14:40:02 | >>>> Wrapper (Version 3.1.2) http://wrapper.tanukisoftware.org >>>> >>>> The line "Shutting down", "Sutdown complete" and "Halting VM" are >>>> being printed >>>> to standard out by a Shutdown Hook registered by JBoss, the >>>> application being >>>> controled by the wrapper. >>>> >>>> The "User logged out. Ignored" indicates that the wrapper is not >>>> being run in a >>>> console (looking at the source code) and when ignored, the wrapper >>>> does not >>>> kill its application. The wrapper then gones on to restart the >>>> application. >>>> >>>> Don't think its relevant, but: >>>> wrapper.disable_shutdown_hook=TRUE >>>> >>>> Why would there be multiple "User logged out. Ignored" lines? >>>> >>>> Any hints as to what mechanism(s) might lead to the wrapped >>>> application >>>> to stop? >>>> >>>> Thanks. >>>> >>>> Richard >>>> >>> >>> >>> >>> ------------------------------------------------------- >>> SF.Net email is sponsored by: >>> Tame your development challenges with Apache's Geronimo App Server. >>> Download >>> it for free - -and be entered to win a 42" plasma tv or your very own >>> Sony(tm)PSP. 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