How to increase a bean's heap size using -XMS

Question

Excuse my ignorance. We developed a bean that opens a hi resolution (3,000 pixels by 3,000 pixels) JPEG from the hard drive and through JAI:
1. Zooms in
2. Crops
3. Streams the result to the browser
It works perfectly with small files but when we use the large JPEGs it gives an Out of Memory Exception
I have read extensively about how easy it should be to do the -XMS in the command line to increase the sandbox size to 256 MB or whatever.
But apparently the command requires the name of an application among its parameters. If we try to run it without such parameter it returns the online help.
Does anyone know what to enter in this parameter? Would it be our bean's name? Or certain class within JAI? How can we know which class is the one that runs out of memory?
Please help!!
:o)

Answer 1

I'll try that first thing tomorrow when I'm in my
workstation. Although I think we tried that. I'll let
you know of the outcome though.
My next question (in case what you say does not solve
our problem) will very very likely be utterly stupid.
I'll make it anyways.
Our bean resizes and crops the image through calls to
JAI. To follow your example, let's assume the bean is
called FooClass. Is it a fact the memory increase
should be applied to FooClass or can it be another JAR
or class outside of ours the one that is actually
running out of memory?
In our first rounds we didn't even have the code
inside a class but rather just a JSP. Since it was
running out of memory and we didn't know how to assign
memory to a JSP we decided to port it to a bean and
attempt to XMX the bean. Is there a way to solve out
of memory errors triggered by a JSP alone and not a
class?The -Xmx and -Xms switches applies to the whole JVM where the class is running. They can not be applied to a special class. Use the java -Xms etc for starting the application server/servlet container where your jsp runs and it will increase the amount of memory available.