title: java.lang.UnsupportedClassVersionError: org/openqa/gr id/selenium/GridLauncher (Unsupported major.minor version 50.0)
body: <p>I got this selenium server jar file in my Selenium folder.  When I'm trying to execute this with <code>java - jar selenium-server-standalone-2.0b3.jar</code> command I'm getting this version difference error. Can anyone please show me where I'm making a mistake?</p>
  
  <pre><code>Exception in thread "main" java.lang.UnsupportedClassVersionError: org/openqa/gr
  id/selenium/GridLauncher (Unsupported major.minor version 50.0)
          at java.lang.ClassLoader.defineClass0(Native Method)
          at java.lang.ClassLoader.defineClass(Unknown Source)
          at java.security.SecureClassLoader.defineClass(Unknown Source)
          at java.net.URLClassLoader.defineClass(Unknown Source)
          at java.net.URLClassLoader.access$100(Unknown Source)
          at java.net.URLClassLoader$1.run(Unknown Source)
          at java.security.AccessController.doPrivileged(Native Method)
          at java.net.URLClassLoader.findClass(Unknown Source)
          at java.lang.ClassLoader.loadClass(Unknown Source)
          at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
          at java.lang.ClassLoader.loadClass(Unknown Source)
          at java.lang.ClassLoader.loadClassInternal(Unknown Source)
  </code></pre>