tomcat-users mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "honyk" <j.tosov...@email.cz>
Subject RE: Memory limits for children processes when running Tomcat as service?
Date Thu, 27 Jun 2013 19:24:03 GMT
On 2013-06-27 André Warnier wrote:
> honyk wrote:
> > On 2013-06-26 André Warnier wrote:
> >> honyk wrote:
> >>> Dear All,
> >>>
> >>> I have a JSF2.0 app that executes (via ProcessBuilder) an external
> >> script.
> >>> This script opens PPTX via PowerPoint ActiveX object, manipulate it
> >> and
> >>> save. It runs on Windows Server 2008 R2 64-bit, 4GB RAM, JDK 7.
> >>>
> >>> When tomcat 7 is launched using startup.bat (with original
> settings),
> >> it
> >>> works fine.
> >>>
> >>> When tomcat runs as a service, opening the PPTX in the PowerPoint
> >> fails
> >>> because of Out Of Memory error regardless Xmx settings
> >> (tomcat7w.exe).
> >>> I originally asked PowerPoint forum, but haven't get any
> explanation
> >> yet:
> >>> http://answers.microsoft.com/thread/37cbebf6-4003-4ab0-9295-
> >> 92413aaecc2e
> >>> But as the entry point is Tomcat and the only difference between
> >> problematic
> >>> and non problematic behavior is the 'service' mode, maybe there is
> >> something
> >>> related in the tomcat7.exe code base. Just guessing.
> >>>
> >>> Has anybody an idea why both modes behave differently?
> >>>
> >> Hi.
> >> The problem has nothing to do with Tomcat per se.
> >> It is due to running a Microsoft Office program (or library modules
> >> such as the "Interop"
> >> series) as a sub-process of a Windows Service (and thus in the same
> >> Service context) which
> >> is something that is not in the design of Microsoft Office, not
> >> supported by Microsoft,
> >> and even actively discouraged by Microsoft.
> >> See : http://support.microsoft.com/kb/257757
> >>
> >> The problem is basically that a Windows Service does not run in the
> >> same "environment" as
> >> a "user session" environment, and as they say in that article, you
> will
> >> certainly
> >> experience "unstable behavior and/or deadlock" somewhere, and will
> get
> >> no help for it.
> >
> > I read this article but because I do not need intraction and my code
> doesn't
> > run simultaneously and tomcat is launched using my credentials - I
> still
> > thought it could be possible.
> >
> > Now realizing that tomcat launched using my credentials do not
> necesarily
> > mean that Office use the same...
> >
> >> Personal experience : some things will work with one MS-Office
> program,
> >> and totally fail
> >> with another; even simple things like opening or saving a file.  It
> may
> >> work with one
> >> file, and fail with another, for no apparent reason.
> >> You get an OOM error in this case, but other cases may be "file not
> >> found" (although it's
> >> there) or whatever other bizarre failures.
> >> Ultimately it is unpredictable, frustrating and time-consuming.
> >
> > I was an optimist when everything worked in the user mode...
> >
> >> Solutions :
> >> 1) instead of MS-Office, use LibreOffice or OpenOffice.  Both can
> run
> >> in "headless" mode,
> >> and provide an API to have them "do things with documents". And both
> >> can open and
> >> manipulate MS-Office documents.  Depending on what you do, there may
> be
> >> some differences
> >> in the results, but it works fine for many things.
> >> Or try one of the other solutions suggested in the above article.
> >> (I have not tried them, I use OpenOffice/LibreOffice).
> >
> > I'll give it a try. I originaly tested Apache POI, but required
> > functionality is not implemented yet.
> >
> >> 2) do not run Tomcat as a Service. Create a virtual Windows machine,
> >> and run it in a user
> >> console (with startup.bat). You can restrict access to the VM, and
> >> since it is a VM, it
> >> can run unattended, just as a service would.
> >> (I am also using this scheme, when circumstances permit).
> >> But in that case, also pay attention to the licensing considerations
> at
> >> the end of the
> >> article.
> >
> > I am quite lost in this ;-) But I'll investigate further.
> >
> > Thanks a lot for your exhaustive analysis! Finally it looks my way is
> no way
> > :-)
> >
> 
> No problem. I went myself through the exact same issues as you
> described, I did believe
> that there must be a workaround, tried a number of things with great
> loss of time, and
> finally had to admit that the MS article was right and that there is no
> good solution with
> MS-Office when starting it from a Service.

I appreciate a lot your response and sharing your experience. Without it I
would spend many additional hours of investigating, trial and error
attempts, asking the same topic in different places, all this in heavy
frustration... 

> About the Virtual Machine solution : usually, when you want something
> to run as a Service,
> it is because it has to run in the background, without a user being
> logged-in, because of
> security e.g.  Also because otherwise, when the logged-in user logs
> off, any program that
> he's running get killed.
> With Virtual Machines (VM in short), you can create a Windows machine
> that has no real
> physical console, runs all the time, and where a user session can stay
> logged-in all the
> time.  So in that kind of machine, it is not usually a problem if a
> user is logged-in and
> remains logged-in, with a console window open, and Tomcat running in
> it.
> And in that console window, your Tomcat could be running via
> startup.bat, and execute your
> MS-Office commands without problems, as it is not a Service.

If I understand it correctly, this would need a special care when the VM is
restarted - the user should log-in again. In meantime this system is out of
work. It is a rare case though.

Jan



---------------------------------------------------------------------
To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
For additional commands, e-mail: users-help@tomcat.apache.org


Mime
View raw message