title: Jar File is running in my computer but not Running in another computer
body: <p>I created a jar file in my laptop and it runs fine in my computer without trouble but when i use the same in my friend's laptop it shows and exception and the file does not run. But it's still good with my laptop. What's the reason?</p>
  
  <p><strong>name of jar =<em>BlueServer.jar</em>
  it has only one class.<br>
  classname=<em>Server.java</em> 
  one external library is used name=<em>Bluecove.jar</em> which is used for accessing bluetooth from java.
  Ide used=Eclipse
  used Eclipse for creating jar,already checked the option "Pacakage required libraries into generated jar"</strong></p>
  
  <p><strong>This Error came while i try to run that same jar in another computer....</strong></p>
  
  <p>java -jar BlueServer.jar
  Exception in thread "main" java.lang.UnsupportedClassVersionError: Server : Unsupported major.minor version 51.0</p>
  
  <pre><code>    at java.lang.ClassLoader.defineClass1(Native Method)
      at java.lang.ClassLoader.defineClass(ClassLoader.java:620)
      at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:124)
      at java.net.URLClassLoader.defineClass(URLClassLoader.java:260)
      at java.net.URLClassLoader.access$000(URLClassLoader.java:56)
      at java.net.URLClassLoader$1.run(URLClassLoader.java:195)
      at java.security.AccessController.doPrivileged(Native Method)
      at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
      at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
      at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
      at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
      at java.lang.Class.forName0(Native Method)
      at java.lang.Class.forName(Class.java:247)
      at org.eclipse.jdt.internal.jarinjarloader.JarRsrcLoader.main(JarRsrcLoader.java:56)
  </code></pre>