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It seems to be a simple question, but I wasn’t able to find a meaningful answer, only a lot of speculations.
Also, if an answer is yes, which JVM would it be, Oracle’s or again something patched by Microsoft?
Specifically: I have a Java desktop application, running on JRE 7, would it run on WinRT?
I mean, can I install JRE 7 on WinRT? Would it run without problems?
Yes and no.
It would certainly be possible to implement a Java Virtual Machine, or at least a substantial portion of one, using the Windows Runtime APIs and the portions of the Windows API that are usable from a Windows Store app. However, such a JVM would need to be an interpreting JVM, not a JIT compiling JVM. JIT compilation requires the ability to change memory protection (to allow execution of generated code), but the APIs to change memory protection (
VirtualProtectand friends) are not callable from user code in a Windows Store app.So, could you implement an interpreting JVM usable in a Windows Store app? Probably. Whether or not it would be possible to implement a JVM that performs well enough to be usable is another matter altogether, though.