title: unsupported major minor version 51.0, but my JRE is up to date
body: <p>I built a Java application in Eclipse on Windows 7.
  I have Mac OSX 10.7.4 on a VMWare machine.</p>
  
  <p>I built the app with JDK 1.7. I have JRE 1.7 on my Windows and the app works fine.
  I have Java 1.7 installed on the Mac VM Machine.</p>
  
  <p>When launching the app on my Mac VM Machine, I get a "unspported major.minor version 51.0" error.</p>
  
  <p>I know that this error means I don't have the right JRE to run my JAR file, but I do have JRE 7 installed (I installed it today). </p>
  
  <p>My Application uses Apache FTP Client libraries but they are all included in the JAR file (I exported the Eclipse project into a Runnable JAR File, with all the required libraries).</p>