Xmx definition

[Amir Hadadi]

I'm running apache tomcat version 5.5.23. my OS is CENTOS 5.
I've used Runtime.getRuntime().getMaxMemory() to get an approximation of my
Xmx. The figure I got was 842MB.
Since this is not the default, and I've looked up in all possible scripts
(including searching for the string 'Xmx' in the entire hard drive) and
found no trace of an Xmx definition, I wonder were this number came from.