In general, you only use it to pass options that you might need. For example the X flag controls memory, so if your app requires it you can instruct tomcat to launch JVMs with a higher max (i.e. if it seems to be running out of memory).
As an example I use: "-Xmx128m" to set the max at 128MB (i think the default is 64?)
Note I'm using this under linux so it's in a shell script.
In the Windows batch file, you'd just use:
set JAVA_OPTS=-Xmx128m
Which I would put after the line "rem ----- Execute The Requested Command" - but that's just me ;^)
You could also use the control panel to set a system-wide env. variable, but you don't need everybody to have it defined, plus it may mess you up when running java apps other than tomcat.
-Steve


Stephen Charles Huey wrote:

I see something in catalina.bat about a JAVA_OPTS environment variable. Do I need to set this in Windows? When I run java -X on the command
line, I see something about a -Xms option for setting the heap size. Do
I just type -Xms <some number> in the Windows environment variable or
what?



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