public class WitnessServiceErrorHandler {
    private final WitnessClient client;
    private final ScheduledExecutorService scheduler;
    private volatile boolean serviceAvailable = true;
    
    public void handleServiceUnavailable(Exception error) {
        log.warn("Witness service unavailable: {}", error.getMessage());
        serviceAvailable = false;
        
        // Schedule retry
        scheduleServiceRetry();
    }