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    <p>In a command prompt, a <code>java -version</code> should show the details of the installed JVM. </p> <p>For example, a jdk7 32-bit version would show this:</p> <pre><code>java version "1.7.0_05" Java(TM) SE Runtime Environment (build 1.7.0_05-b06) Java HotSpot(TM) Client VM (build 23.1-b03, mixed mode, sharing) </code></pre> <p>A jdk7 64-bit version would show this:</p> <pre><code>java version "1.7.0_05" Java(TM) SE Runtime Environment (build 1.7.0_05-b06) Java HotSpot(TM) 64-Bit Server VM (build 23.1-b03, mixed mode) </code></pre> <p>However, the standard JDK installation copies the <code>java.exe</code> and <code>javaw.exe</code> on the <code>c:\Windows\System32</code> folder, which could be the ones that Eclipse looks for. This could get really messy if you've tried to re-install different JDK versions and you loose track of the last one you installed (or like me, if you install different versions for backwards support on some legacy projects).</p> <p>To be 100% sure of the JVM used by your Eclipse, just modify the <code>eclipse.ini</code> file located in your <code>eclipse/</code> folder so it points to the exact JVM you want. For example, add these lines if you want to use your jdk7 64-bit (check if the same folder applies):</p> <pre><code>-vm C:\Program Files\Java\jdk1.7.0_05\bin\javaw.exe </code></pre> <p>Start Eclipse, and it should work fine.</p> <p>Go to <a href="http://wiki.eclipse.org/Eclipse.ini" rel="nofollow">this site</a> fore more info on the <code>eclipse.ini</code> configuration.</p>
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