Custom Error Handler for Retrofit

BadRequestException.java

public class BadRequestException extends Exception {
        public BadRequestException() { super(); }
        public BadRequestException(String message) { super(message); }
        public BadRequestException(String message, Throwable cause) { super(message, cause); }
        public BadRequestException(Throwable cause) { super(cause); }
}

CustomErrorHandler.java

class CustomErrorHandler implements ErrorHandler {
    @Override public Throwable handleError(RetrofitError cause) {
        Response r = cause.getResponse();
        if (r != null && r.getStatus() == 422) {

            String message = "";
            try {
                message = CharStreams.toString(new InputStreamReader(r.getBody().in(), Charsets.UTF_8));
            } catch (IOException e) {
                e.printStackTrace();
            }

            return new BadRequestException(message);
        }
        if (r != null && r.getStatus() == 403) {

            return new NotAuthorizedException("Not authorized");
        }
        return cause;
    }
}    

NotAuthorizedException.java

public class NotAuthorizedException extends Exception {
        public NotAuthorizedException() { super(); }
        public NotAuthorizedException(String message) { super(message); }
        public NotAuthorizedException(String message, Throwable cause) { super(message, cause); }
        public NotAuthorizedException(Throwable cause) { super(cause); }
}