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Changing the Java VM in Jaguar Manager

, 4 Nov 2013 CPOL
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How to change the Java VM in Jaguar Manager

EA Server 5.5 comes with a manager application called Jaguar Manager (also called Sybase Central). This is really a Java product, but in this version it’s wrapped in a program called scjview.exe. This is available in %SYBASE%\Shared\Sybase Central 4.3\win32.

I found out this is using an old JRE 1.4. (I use process explorer in Sysinternals. It’s a great tool!) I wanted to switch the EA Server to Java 1.5 , which is the latest version of Java supported in EAS 5.5. With the EA Server itself, this is easy. Just pass -jdk15 to the serverstart batch file.

With Jaguar Manager, this is not as straightforward. There is a batch file called jagmgr.bat but this only calls scjview.exe mentioned above. The Java runtime is probably picked up using a DLL named jsyblib142.dll, in %SYBASE%\Shared\win32.

After Googling for a bit, I found a solution to this problem. Apparently, scjview.exe has a command line argument -batch. If you pass this in, the program generates a batch file called sybasecentral.bat in the same directory as scjview.

Now, this batch file runs Java with a bunch of Jar files. You can change the path of the Java command to change the Java version it’s run in. Such a simple solution, completely hidden! And with this available, why did they have to create an EXE like that?? Beats me!

Of course, once you convert to batch file, you can tweak the Java parameters such as memory, etc. to run better.

Filed under: CodeProject, Misc
Tagged: easerver

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This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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About the Author

Sam Varadarajan
Software Developer (Senior) City of Los Angeles
United States United States
Originally a Physics major, fell in love with Microprocessors and switched to Computer Science 20+ years ago. Since then, dabbled in various languages including, PowerBuilder, Oracle, Java, C, C++, Perl, Python etc. Constantly striving for quality and performance too.
 
I try to help fellow developers with technology as a way of "giving back to the community". Blogging became a natural extension of that effort. Still learning to perfect that art. If one new programmer out there benefits from this blog, my time and effort are fully worth it.
 
The underlying theme in my blogs is power and beauty of programming (and technology in general). A well written program gives me the sense of awe you get when you look at a man made wonder like Angkor Wat. You experience poetry, art, mystique, power all at once. A program and the troubleshooting that ensues also gives you a feeling you get while reading a mystery novel!
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