title: Java .jar app doesn't start on Mac Os X Snow Leopard
body: <p>I'm developing a Java app with <em>NetBeans 7.2</em> and JDK 7. It's set to use the system look and feel. It runs fine on <em>Windows</em>, but when I double click the <em>jar</em> on a <em>Mac OS X</em> Snow Leopard I get: </p>
  
  <p><code>The Java JAR File could not be launched, check console for possible error messages.</code></p>
  
  <p>Apparently Snow Leopard is using JRE 6 and can't be updated. I thought Java is all about "Write once run anywhere", but that doesn't seem to be the case.</p>
  
  <p>What wrong here and can I somehow make my app run on this mac?</p>