(?) Question: is the virtual machine eternal ?

How will develop itself the Virtual Machine and how will be supported the compliancy between the ocean of code already written and the new virtual reality ? Will the bytecode interpreter always in the future support the old compiled code ?

I guess english is not your first language :)
The VM Spec says "Future versions of the Java Virtual Machine will be backward compatible with this specification" (1.02)
So in other words all new VM's should be fully backwards compatible.

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