// use plain JDK Object(Input|Output)Stream
ISerializer serializer = new GaeObjectSerializer(application.getApplicationKey());
application.getFrameworkSettings().setSerializer(serializer);
// save older version of pages in the HttpSession
final IDataStoreEvictionStrategy evictionStrategy;
if (application instanceof GaeApplication) {
evictionStrategy = ((GaeApplication) application).getEvictionStrategy();
} else {
evictionStrategy = new PageNumberEvictionStrategy(10);
}