My config: Eclipse Version: 3.6.2 / Windows 7 64 Bits
I carefully followed all the instructions to install the AppEngine eclipse 
plug-in and to execute the sample app. However I am getting the following 
problem.
Any help very much appreciated.
Cheers

Jun 2, 2011 2:03:08 PM java.util.prefs.WindowsPreferences <init>
WARNING: Could not open/create prefs root node Software\JavaSoft\Prefs at 
root 0x80000002. Windows RegCreateKeyEx(...) returned error code 5.
java.lang.RuntimeException: Unable to create a DevAppServer
    at 
com.google.appengine.tools.development.DevAppServerFactory.createDevAppServer(DevAppServerFactory.java:90)
    at 
com.google.appengine.tools.development.DevAppServerFactory.createDevAppServer(DevAppServerFactory.java:38)
    at 
com.google.appengine.tools.development.DevAppServerMain$StartAction.apply(DevAppServerMain.java:154)
    at 
com.google.appengine.tools.util.Parser$ParseResult.applyArgs(Parser.java:48)
    at 
com.google.appengine.tools.development.DevAppServerMain.<init>(DevAppServerMain.java:113)
    at 
com.google.appengine.tools.development.DevAppServerMain.main(DevAppServerMain.java:89)
Caused by: java.lang.RuntimeException: java.lang.NoSuchMethodException: 
sun.net.www.protocol.https.Handler.openConnection(java.net.URL)
    at 
com.google.appengine.tools.development.StreamHandlerFactory.getDeclaredMethod(StreamHandlerFactory.java:161)
    at 
com.google.appengine.tools.development.LocalURLFetchServiceStreamHandler.<init>(LocalURLFetchServiceStreamHandler.java:52)
    at 
com.google.appengine.tools.development.StreamHandlerFactory.<init>(StreamHandlerFactory.java:106)
    at 
com.google.appengine.tools.development.StreamHandlerFactory.install(StreamHandlerFactory.java:65)
    at 
com.google.appengine.tools.development.DevAppServerImpl.<init>(DevAppServerImpl.java:110)
    at 
com.google.appengine.tools.development.DevAppServerImpl.<init>(DevAppServerImpl.java:85)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at 
sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:44)
    at 
sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:516)
    at 
com.google.appengine.tools.development.DevAppServerFactory.createDevAppServer(DevAppServerFactory.java:84)
    ... 5 more
Caused by: java.lang.NoSuchMethodException: 
sun.net.www.protocol.https.Handler.openConnection(java.net.URL)
    at java.lang.Class.throwNoSuchMethodException(Class.java:286)
    at java.lang.Class.getDeclaredMethod(Class.java:612)
    at 
com.google.appengine.tools.development.StreamHandlerFactory.getDeclaredMethod(StreamHandlerFactory.java:157)
    ... 15 more
I believe I have carefully followed all the instructions to configure my 
AppEngine plugin in Eclipse 

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