final InteractionParams interactionParams = performBlockingInteraction.getInteractionParams();
WSRP2ExceptionFactory.throwMissingParametersIfValueIsMissing(interactionParams, "InteractionParams", PBI);
RequestProcessor<BlockingInteractionResponse> requestProcessor = ProcessorFactory.getProcessorFor(producer, performBlockingInteraction);
PortletInvocationResponse response;
String handle = requestProcessor.getPortletContext().getPortletHandle();
try
{
response = invoke(requestProcessor, performBlockingInteraction.getRegistrationContext(), PBI, handle);
}