I'm going to be deploying some web applications on a 64-bit JVM. I
would like to know if its required to recompile/rebuild my web
application on the 64-bit JVM, or I can just move the compiled
byte-code classes direct from my current 32-bit JVM development server.

I'm trying to create the fastest way to cast a Java long to an int while
preserving array bounds checking. This is the approach I suspect should be
optimal:
   public final static int toIntIndex(long index) {

Does anyone know of any performance or other issue if java min and max
heap size is set to a value other than the power of 2 (for example,
1536 mb)?
Thanks,

Does anyone have references to performance stats or whitepapers about
performance of native java processors vs. software jvm for embedded apps?
I read the hardware specs on a couple of 100mhz processors and they didn't
seem very impressive, even for running bytecode in hardware.  ...

I am drawing up the specifications for a machine to deploy a
potentially mem-grabbing application (might be up to the order of
several GB when doing batch processings), and am considering to go for
a 64bit JVM to circumvent the 2GB limit on linux.