in

if(retry) {
        // resend all idempotent requests
        HttpUriRequest currentReq = (HttpUriRequest) context.getAttribute( ExecutionContext.HTTP_REQUEST );
        String requestType = currentReq.getMethod();
        retry = !requestType.equals("POST");
    }

currentReq returned is null and so the the currentReq.getMethod() crashs, leaving my application on a blocking state due to the fact that im waiting on the listeners to be invoked.
This happens for example if my Device is on Wi-Fi but with no internet connectivity