package com.yahoo.java;import java.io.PrintStream;import java.io.PrintWriter;/** * Extension of the java.lang.Error class to provide the Java 1.4 * embedded cause functionality on platforms that don't already provide it. * * @author Ryan Kennedy */public class ExtendedError extends Error {    /**     * The underlying cause of the error.     */    private Throwable cause;    /**     * Constructs an error with an underlying cause.     *     * @param cause The underlying cause of the error.     */    public ExtendedError(Throwable cause) {        this.cause = cause;    }    /**     * Constructs an error with an underlying cause and a message     *     * @param message The message of the error.     * @param cause The underlying cause of the error.     */    public ExtendedError(String message, Throwable cause) {        super(message);        this.cause = cause;    }    /**     * Implements printStackTrace so that it prints the stack trace for     * both this error and the underyling cause, if there is one.     */    public void printStackTrace() {        super.printStackTrace();        if(cause != null) {            System.err.print("Underlying cause: ");            cause.printStackTrace();        }    }    /**     * Implements printStackTrace so that it prints the stack trace for     * both this error and the underyling cause, if there is one.     *     * @param s The print stream to print the stack trace to.     */    public void printStackTrace(PrintStream s) {        super.printStackTrace(s);        if(cause != null) {            s.print("Underlying cause: ");            cause.printStackTrace(s);        }    }    /**     * Implements printStackTrace so that it prints the stack trace for     * both this error and the underyling cause, if there is one.     *     * @param s The print writer to write the stack trace to.      */    public void printStackTrace(PrintWriter s) {        super.printStackTrace(s);        if(cause != null) {            s.print("Underlying cause: ");            cause.printStackTrace(s);        }    }}