Why set Xss and under what condition we need to set XSS

Hi guys,
In most of my java app, I will just set Xmx and Xmx. I would like to find out under what condition we need to specifically set Xss? Thanks in advance!
Cheers,
Mark

When you need a lot of stack. Or when you don't want a lot of stack to save memory.
Like, if you were doing naive recursion or just had so many frameworks inter operating that the stack would become too small.

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