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copied!<pre><code>System.getProperty("os.arch"); </code></pre> <p>Should be available on all platforms, see the Java <a href="http://download.oracle.com/javase/tutorial/essential/environment/sysprop.html" rel="nofollow noreferrer">System Properties Tutorial</a> for more information.</p> <p><strong>But</strong> 64 bit Windows platforms will lie to the JVM if it is a 32 bit JVM. Actually 64 bit Windows will lie to any 32 bit process about the environment to help old 32 bit programs work properly on a 64 bit OS. Read the <a href="http://msdn.microsoft.com/en-us/library/aa384249%28v=vs.85%29.aspx" rel="nofollow noreferrer">MSDN article about WOW64</a> for more information.</p> <p>As a result of WOW64, a 32 bit JVM calling <code>System.getProperty("os.arch")</code> will return "x86". If you want to get the <em>real</em> architecture of the underlying OS on Windows, use the following logic:</p> <pre><code>String arch = System.getenv("PROCESSOR_ARCHITECTURE"); String wow64Arch = System.getenv("PROCESSOR_ARCHITEW6432"); String realArch = arch != null && arch.endsWith("64") || wow64Arch != null && wow64Arch.endsWith("64") ? "64" : "32"; </code></pre> <p>See also:</p> <p><a href="http://blogs.msdn.com/b/david.wang/archive/2006/03/26/howto-detect-process-bitness.aspx" rel="nofollow noreferrer">HOWTO: Detect Process Bitness</a></p> <p><a href="https://stackoverflow.com/questions/1738985/why-processor-architecture-always-returns-x86-instead-of-amd64">Why %processor_architecture% always returns x86 instead of AMD64</a></p> <p><a href="https://stackoverflow.com/questions/601089/detect-whether-current-windows-version-is-32-bit-or-64-bit">Detect whether current Windows version is 32 bit or 64 bit</a></p>

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