title: Google Developer Tools Java FATAL ERROR
body: <p>Thanks in advance for your help. </p>
  
  <p>I am new to the <code>Google developer tools</code> and I have been messing around trying to figure out how to get one of their features to work. </p>
  
  <p>This one most specifically: </p>
  
  <p><a href="https://developers.google.com/appengine/docs/java/tools/eclipse#Running_the_Project" rel="nofollow">https://developers.google.com/appengine/docs/java/tools/eclipse#Running_the_Project</a></p>
  
  <p>So this is how far I've gotten. </p>
  
  <p>I updated my <code>Java package to 1.7</code>. I installed the <code>Google plug in</code> for <code>eclipse</code>., </p>
  
  <p>I created a new project named "<code>Guestbook</code>", made sure the boxes were checked, <code>run-&gt;DebugAs-&gt; WebApplication</code>, and then I get this huge <strong>error</strong>: </p>
  
  <blockquote>
    <p>Exception in thread "main" FATAL ERROR in native method: processing of
    -javaagent failed java.lang.UnsupportedClassVersionError: com/google/appengine/tools/development/agent/AppEngineDevAgent :
    Unsupported major.minor version 51.0  at
    java.lang.ClassLoader.defineClass1(Native Method)     at
    java.lang.ClassLoader.defineClassCond(ClassLoader.java:637)   at
    java.lang.ClassLoader.defineClass(ClassLoader.java:621)   at
    java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141)
      at java.net.URLClassLoader.defineClass(URLClassLoader.java:283)     at
    java.net.URLClassLoader.access$000(URLClassLoader.java:58)    at
    java.net.URLClassLoader$1.run(URLClassLoader.java:197)    at
    java.security.AccessController.doPrivileged(Native Method)    at
    java.net.URLClassLoader.findClass(URLClassLoader.java:190)    at
    java.lang.ClassLoader.loadClass(ClassLoader.java:306)     at
    sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)     at
    java.lang.ClassLoader.loadClass(ClassLoader.java:247)     at
    sun.instrument.InstrumentationImpl.loadClassAndStartAgent(InstrumentationImpl.java:280)
      at
    sun.instrument.InstrumentationImpl.loadClassAndCallPremain(InstrumentationImpl.java:338)</p>
  </blockquote>
  
  <p>I don't know what all this means. </p>
  
  <p>I am still fairly new to java, so any help would be excellent. </p>
  
  <p>Hope all is well</p>