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/*
* @(#)ClassNotFoundException.java 1.20 04/02/19
*
* Copyright 2004 Sun Microsystems, Inc. All rights reserved.
* SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
*/
package java.lang;
/** Thrown when an application tries to load in a class through its string name using:
*
* - The
forName method in class Class.
* - The
findSystemClass method in class ClassLoader .
* - The
loadClass method in class ClassLoader.
*
*
* but no definition for the class with the specified name could be found.
*
*
* As of release 1.4, this exception has been retrofitted to conform to the general purpose exception-chaining mechanism. The
* "optional exception that was raised while loading the class" that may be provided at construction time and accessed via the
* {@link #getException()} method is now known as the cause, and may be accessed via the {@link Throwable#getCause()}
* method, as well as the aforementioned "legacy method."
*
* @author unascribed
* @version 1.20, 02/19/04
* @see java.lang.Class#forName(java.lang.String)
* @see java.lang.ClassLoader#findSystemClass(java.lang.String)
* @see java.lang.ClassLoader#loadClass(java.lang.String, boolean)
* @since JDK1.0 */
public class ClassNotFoundException extends Exception {
/** use serialVersionUID from JDK 1.1.X for interoperability */
private static final long serialVersionUID = 9176873029745254542L;
/** This field holds the exception ex if the ClassNotFoundException(String s, Throwable ex) constructor was used to instantiate
* the object
* @serial
* @since 1.2 */
private Throwable ex;
/** Constructs a ClassNotFoundException with no detail message. */
public ClassNotFoundException () {
super((Throwable)null); // Disallow initCause
}
/** Constructs a ClassNotFoundException with the specified detail message.
*
* @param s the detail message. */
public ClassNotFoundException (String s) {
super(s, null); // Disallow initCause
}
/** Constructs a ClassNotFoundException with the specified detail message and optional exception that was raised
* while loading the class.
*
* @param s the detail message
* @param ex the exception that was raised while loading the class
* @since 1.2 */
public ClassNotFoundException (String s, Throwable ex) {
super(s, null); // Disallow initCause
this.ex = ex;
}
/** Returns the exception that was raised if an error occurred while attempting to load the class. Otherwise, returns
* null.
*
*
* This method predates the general-purpose exception chaining facility. The {@link Throwable#getCause()} method is now the
* preferred means of obtaining this information.
*
* @return the Exception that was raised while loading a class
* @since 1.2 */
public Throwable getException () {
return ex;
}
/** Returns the cause of this exception (the exception that was raised if an error occurred while attempting to load the class;
* otherwise null).
*
* @return the cause of this exception.
* @since 1.4 */
public Throwable getCause () {
return ex;
}
}