package com.yahoo.shopping;import java.io.PrintStream;import java.io.PrintWriter;// TODO: Make the HTTP response code available./** * Exception class indicating a search failure caused by either a client error * (invalid or missing argument) or a service error. * * @author Ryan Kennedy */public class ShoppingException extends Exception {    private Throwable cause;    /**     * Constructs a search exception with a message.     *     * @param message The message to wrap inside the exception.     */    public ShoppingException(String message) {        super(message);    }    /**     * Constructs a search exception with a message and an underlying cause.     *     * @param message The message to wrap inside the exception.     * @param cause The underlying cause of the search exception.     */    public ShoppingException(String message, Throwable cause) {        super(message);        this.cause = cause;    }    public void printStackTrace() {        super.printStackTrace();        if (cause != null) {            System.err.print("Underlying cause: ");            cause.printStackTrace();        }    }    public void printStackTrace(PrintStream s) {        super.printStackTrace(s);        if (cause != null) {            s.print("Underlying cause: ");            cause.printStackTrace(s);        }    }    public void printStackTrace(PrintWriter s) {        super.printStackTrace(s);        if (cause != null) {            s.print("Underlying cause: ");            cause.printStackTrace(s);        }    }}