Re: [Wrapper-user] Wrapper shuts down on Linux

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We've seen this behavior using a certain version of Sun's 1.5 JVM, which had
a bug that caused the JVM to chew on the processor for longer than the
wrapper would tolerate.  We're using 1.5.10 now, the version in which the
following bug was fixed:

    http://bugs.sun.com/view_bug.do?bug_id=6433335

Regrads,

Nick

On Thu, Sep 4, 2008 at 10:00 AM, Leif Mortenson <le...@ta...>wrote:

> David,
> Assuming that the Wrapper has been working correctly for a few days as
> you say, I am unsure as to what is happening here with just the
> information you provided.
> Could you please set the wrapper.debug=true property and reproduce
> this?   Then send me the resulting full wrapper.log file to my email
> directly as it is large for the list.
>
> >From the log, the JVM appears to have frozen and was killed for some
> reason.  When the Wrapper then attempts to relaunch the JVM process,
> it fails to start within 30 seconds.
>
> What is the status of your system when this happens?   Is it possible
> that the system is being bogged down by another process?  If the JVM
> is failing to receive any CPU for a long period of time, it could
> appear to be frozen.  That would also explain why it would take a long
> time for the next JVM invocation to start up.   In either case, there
> are timeouts which can be extended to avoid this problem.
>
> Cheers,
> Leif
>
> On Thu, Sep 4, 2008 at 11:47 AM, David Hoffer <dho...@gm...> wrote:
> > I am using the wrapper on Linux running as a daemon.  For some reason
> after
> > running for a while (few days) it shuts down.  Here is the log:
> >
> > INFO   | jvm 1    | 2008/08/31 15:22:52 |
> > --------------------------------------
> > ERROR  | wrapper  | 2008/09/02 07:49:32 | JVM appears hung: Timed out
> > waiting for signal from JVM.
> > ERROR  | wrapper  | 2008/09/02 07:49:33 | JVM did not exit on request,
> > terminated
> > STATUS | wrapper  | 2008/09/02 07:49:40 | Launching a JVM...
> > ERROR  | wrapper  | 2008/09/02 07:50:10 | Startup failed: Timed out
> waiting
> > for a signal from the JVM.
> > ADVICE | wrapper  | 2008/09/02 07:50:10 |
> > ADVICE | wrapper  | 2008/09/02 07:50:10 |
> > ------------------------------------------------------------------------
> > ADVICE | wrapper  | 2008/09/02 07:50:10 | Advice:
> > ADVICE | wrapper  | 2008/09/02 07:50:10 | The Wrapper consists of a
> native
> > component as well as a set of classes
> > ADVICE | wrapper  | 2008/09/02 07:50:10 | which run within the JVM that
> it
> > launches.  The Java component of the
> > ADVICE | wrapper  | 2008/09/02 07:50:10 | Wrapper must be initialized
> > promptly after the JVM is launched or the
> > ADVICE | wrapper  | 2008/09/02 07:50:10 | Wrapper will timeout, as just
> > happened.  Most likely the main class
> > ADVICE | wrapper  | 2008/09/02 07:50:10 | specified in the Wrapper
> > configuration file is not correctly initializing
> > ADVICE | wrapper  | 2008/09/02 07:50:10 | the Wrapper classes:
> > ADVICE | wrapper  | 2008/09/02 07:50:10 |
> > com.dhs.service.JavaServiceWrapperWebServiceLauncher
> > ADVICE | wrapper  | 2008/09/02 07:50:10 | While it is possible to do so
> > manually, the Wrapper ships with helper
> > ADVICE | wrapper  | 2008/09/02 07:50:10 | classes to make this
> > initialization processes automatic.
> > ADVICE | wrapper  | 2008/09/02 07:50:10 | Please review the integration
> > section of the Wrapper's documentation
> > ADVICE | wrapper  | 2008/09/02 07:50:10 | for the various methods which
> can
> > be employed to launch an application
> > ADVICE | wrapper  | 2008/09/02 07:50:10 | within the Wrapper:
> > ADVICE | wrapper  | 2008/09/02 07:50:10 |
> > http://wrapper.tanukisoftware.org/doc/english/integrate.html
> > ADVICE | wrapper  | 2008/09/02 07:50:10 |
> > ------------------------------------------------------------------------
> > ADVICE | wrapper  | 2008/09/02 07:50:10 |
> > ERROR  | wrapper  | 2008/09/02 07:50:11 | JVM did not exit on request,
> > terminated
> > STATUS | wrapper  | 2008/09/02 07:50:11 | JVM received a signal SIGKILL
> (9).
> > STATUS | wrapper  | 2008/09/02 07:50:16 | Launching a JVM...
> > ERROR  | wrapper  | 2008/09/02 07:50:46 | Startup failed: Timed out
> waiting
> > for a signal from the JVM.
> > ADVICE | wrapper  | 2008/09/02 07:50:46 |
> >
> > What may be causing this?  I am not a Linux guur.  I have used the
> wrapper
> > on Windows with no issues.  My code to handle controlEvents is:
> >
> > if (WrapperManager.isControlledByNativeWrapper()) {
> >                 // The Wrapper will take care of this event
> >             } else {
> >                 // We are not being controlled by the Wrapper, so
> >                 //  handle the event ourselves.
> >                 if ((event == WrapperManager.WRAPPER_CTRL_C_EVENT) ||
> (event
> > == WrapperManager.WRAPPER_CTRL_CLOSE_EVENT) || (event ==
> > WrapperManager.WRAPPER_CTRL_SHUTDOWN_EVENT)) {
> >                     log.warn("We are handling the received event
> ourselves
> > and we are stopping the service");
> >                     WrapperManager.stop(0);
> >                 }
> >             }
> >
> > I am using the wrapper integrated, that is I implement WrapperListener
> > interface.
> >
> > Since I am running as a daemon, I don't want this to ever shut down, and
> if
> > does for some reason I would like it to auto restart (don't know how to
> do
> > this on Linux).
> >
> > Why might I be getting these JVM appears hung: Timed out waiting for
> signal
> > from JVM. errors?
> >
> > -Dave
> >
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