Thanks.

However, I've tryed with your .jar but I still have the save problem. Here 
is the error :

java.lang.NoClassDefFoundError: sun.reflect.ReflectionFactory is a restricted 
class. Please see the Google App Engine developer's guide for more details.
        at 
com.google.apphosting.runtime.security.shared.stub.sun.reflect.ReflectionFactory.<clinit>(ReflectionFactory.java)
        at 
com.thoughtworks.xstream.converters.reflection.Sun14ReflectionProvider.getLazyRefectionFactory(Sun14ReflectionProvider.java:105)
        at 
com.thoughtworks.xstream.converters.reflection.Sun14ReflectionProvider.getMungedConstructor(Sun14ReflectionProvider.java:97)
        at 
com.thoughtworks.xstream.converters.reflection.Sun14ReflectionProvider.newInstance(Sun14ReflectionProvider.java:76)
        at 
com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.instantiateNewInstance(AbstractReflectionConverter.java:313)
        at 
com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.unmarshal(AbstractReflectionConverter.java:162)
        at 
com.thoughtworks.xstream.core.TreeUnmarshaller.convert(TreeUnmarshaller.java:82)
        at 
com.thoughtworks.xstream.core.AbstractReferenceUnmarshaller.convert(AbstractReferenceUnmarshaller.java:63)
        at 
com.thoughtworks.xstream.core.TreeUnmarshaller.convertAnother(TreeUnmarshaller.java:76)
        at 
com.thoughtworks.xstream.core.TreeUnmarshaller.convertAnother(TreeUnmarshaller.java:60)
        at 
com.thoughtworks.xstream.core.TreeUnmarshaller.start(TreeUnmarshaller.java:137)
        at 
com.thoughtworks.xstream.core.AbstractTreeMarshallingStrategy.unmarshal(AbstractTreeMarshallingStrategy.java:33)
        at com.thoughtworks.xstream.XStream.unmarshal(XStream.java:965)
        at com.thoughtworks.xstream.XStream.unmarshal(XStream.java:950)
        at com.thoughtworks.xstream.XStream.fromXML(XStream.java:893)

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