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Memory limits for children processes when running Tomcat as service?

0 votes

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:

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?

posted Jun 26, 2013 by anonymous

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I forgot to mention that the Tomcat service is launched using my credentials (not as local admin). The same account I use for a remote access and hence for launching the tomcat via startup.bat.

I really do not see any differences. The same commands (cmd.exe, csript.exe, ...) are executed (64-bit variants) with the same params, but in one case there are memory limits.

Btw, could be there any memory differences between users? I'll rather double check this. But I don't know how :-(

What else... antivirus, firewall? I'll try to disable it for a while. AFAIK tomcat.exe is based on procrun wrapper. Is this wrapper memory safe?

I just think (aloud) I could write a custom wrapper and execute my script directly from this new service... Quite complex to me... But I could check if it behaves differently or not...

1 Answer

0 votes

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 :

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.

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.

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).
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.

answer Jun 26, 2013 by anonymous
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