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First check java bitness : isCurrentJava64Bit(); If it returns false, then do system-dependent checks. Windows: IsWow64Process(); Linux: 'uname -m' == (x86_64, amd64, ppc64...) Alternative : 'uname -i', 'umame -p', 'getconf LONG_BIT' Solaris i386: 'isainfo -k' == amd64 Solaris sparc (64bit): 'isainfo -k' == sparcv9 Mac OS X: no known way yet.
AIX: 'getconf KERNEL_BITMODE' (returns 64, not yet checked on 32bit systems)
HP-UX: 'getconf KERNEL_BITS' (returns 64)
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