The default RequestProcessorFactoryFactory is the RequestProcessorFactoryFactory.RequestSpecificProcessorFactoryFactory. It creates a new processor instance for any request. In other words, it allows the request processor to have some state. This is fine, if the request processor is a lightweight object or needs request specific initialization. In this case, the actual request processor is created and invoked when calling RequestProcessorFactoryFactory.RequestProcessorFactory.getRequestProcessor(XmlRpcRequest).
The really sad part is that in the Java world this specific example cannot be considered that extreme any more.