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    <p>The JVM architecture in use can be retrieved using the "<a href="http://java.sun.com/javase/6/docs/api/java/lang/System.html#getProperties()" rel="nofollow noreferrer">os.arch</a>" property:</p> <pre><code>System.getProperty("os.arch"); </code></pre> <p>The "os" part seems to be a bit of a misnomer, or perhaps the original designers did not expect JVMs to be running on architectures they weren't written for. Return values seem to be <a href="http://javablog.co.uk/2007/05/19/making-jni-cross-platform/" rel="nofollow noreferrer">inconsistent</a>.</p> <p>The NetBeans Installer team are <a href="http://wiki.netbeans.org/NBINotes" rel="nofollow noreferrer">tackling the issue</a> of JVM vs OS architecture. Quote:</p> <blockquote> <p><strong>x64 bit : Java and System</strong></p> <p>Tracked as the <a href="http://www.netbeans.org/issues/show_bug.cgi?id=143434" rel="nofollow noreferrer">Issue 143434</a>.</p> <p>Currently we using x64 bit of JVM to determine if system (and thus Platform.getHardwareArch()) is 64-bit or not. This is definitely wrong since it is possible to run 32bit JVM on 64bit system. We should find a solution to check OS real 64-bitness in case of running on 32-bit JVM.</p> <ul> <li>for Windows it can be done using WindowsRegistry.IsWow64Process()</li> <li>for Linux - by checking 'uname -m/-p' == x86_64</li> <li>for Solaris it can be done using e.g. 'isainfo -b'</li> <li>for Mac OSX it can't be done using uname arguments, probably it can be solved by creating of 64-bit binary and executing on the platform... (unfortunately, this does not work:( I've created binary only with x86_64 and ppc64 arch and it was successfully executed on Tiger..)</li> <li>for Generic Unix support - it is not clear as well... likely checking for the same 'uname -m/-p' / 'getconf LONG_BIT' and comparing it with some possible 64-bit values (x86_64, x64, amd64, ia64).</li> </ul> </blockquote> <hr> <p>Sample properties from different JVMs all running on 64bit Ubuntu 8.0.4:</p> <p>32bit IBM 1.5:</p> <pre><code>java.vendor=IBM Corporation java.vendor.url=http://www.ibm.com/ java.version=1.5.0 java.vm.info=J2RE 1.5.0 IBM J9 2.3 Linux x86-32 j9vmxi3223-20061001 (JIT enabled) J9VM - 20060915_08260_lHdSMR JIT - 20060908_1811_r8 GC - 20060906_AA java.vm.name=IBM J9 VM java.vm.specification.name=Java Virtual Machine Specification java.vm.specification.vendor=Sun Microsystems Inc. java.vm.specification.version=1.0 java.vm.vendor=IBM Corporation java.vm.version=2.3 os.arch=x86 os.name=Linux os.version=2.6.24-23-generic sun.arch.data.model=32 </code></pre> <p>64bit Sun 1.6:</p> <pre><code>java.vendor=Sun Microsystems Inc. java.vendor.url=http://java.sun.com/ java.vendor.url.bug=http://java.sun.com/cgi-bin/bugreport.cgi java.version=1.6.0_05 java.vm.info=mixed mode java.vm.name=Java HotSpot(TM) 64-Bit Server VM java.vm.specification.name=Java Virtual Machine Specification java.vm.specification.vendor=Sun Microsystems Inc. java.vm.specification.version=1.0 java.vm.vendor=Sun Microsystems Inc. java.vm.version=10.0-b19 os.arch=amd64 os.name=Linux os.version=2.6.24-23-generic sun.arch.data.model=64 </code></pre> <p>64bit GNU 1.5:</p> <pre><code>java.vendor=Free Software Foundation, Inc. java.vendor.url=http://gcc.gnu.org/java/ java.version=1.5.0 java.vm.info=GNU libgcj 4.2.4 (Ubuntu 4.2.4-1ubuntu3) java.vm.name=GNU libgcj java.vm.specification.name=Java(tm) Virtual Machine Specification java.vm.specification.vendor=Sun Microsystems Inc. java.vm.specification.version=1.0 java.vm.vendor=Free Software Foundation, Inc. java.vm.version=4.2.4 (Ubuntu 4.2.4-1ubuntu3) os.arch=x86_64 os.name=Linux os.version=2.6.24-23-generic </code></pre> <p>(The GNU version does not report the "sun.arch.data.model" property; presumably other JVMs don't either.)</p>
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