OT: Java web hosting

[Meng Cheah]

Excuse my ignorance, I've tried "googling".

What is the difference between Java web hosting and plain web hosting 
with say, PHP? I understand it involves JVM.

Why is it that less companies offer it and it may cost more?
Is more bandwidth involved and a different set of skills or complexity?

What is to stop someone running his or her own server and hosting 
Java-based apps?

Thanks in advance.

Meng
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