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15 * accompanied this code).
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29 * Thrown when an application tries to load in a class through its
32 * <li>The <code>forName</code> method in class <code>Class</code>.
33 * <li>The <code>findSystemClass</code> method in class
34 * <code>ClassLoader</code> .
35 * <li>The <code>loadClass</code> method in class <code>ClassLoader</code>.
38 * but no definition for the class with the specified name could be found.
40 * <p>As of release 1.4, this exception has been retrofitted to conform to
41 * the general purpose exception-chaining mechanism. The "optional exception
42 * that was raised while loading the class" that may be provided at
43 * construction time and accessed via the {@link #getException()} method is
44 * now known as the <i>cause</i>, and may be accessed via the {@link
45 * Throwable#getCause()} method, as well as the aforementioned "legacy method."
48 * @see java.lang.Class#forName(java.lang.String)
49 * @see java.lang.ClassLoader#findSystemClass(java.lang.String)
50 * @see java.lang.ClassLoader#loadClass(java.lang.String, boolean)
53 public class ClassNotFoundException extends ReflectiveOperationException {
55 * use serialVersionUID from JDK 1.1.X for interoperability
57 private static final long serialVersionUID = 9176873029745254542L;
60 * This field holds the exception ex if the
61 * ClassNotFoundException(String s, Throwable ex) constructor was
62 * used to instantiate the object
69 * Constructs a <code>ClassNotFoundException</code> with no detail message.
71 public ClassNotFoundException() {
72 super((Throwable)null); // Disallow initCause
76 * Constructs a <code>ClassNotFoundException</code> with the
77 * specified detail message.
79 * @param s the detail message.
81 public ClassNotFoundException(String s) {
82 super(s, null); // Disallow initCause
86 * Constructs a <code>ClassNotFoundException</code> with the
87 * specified detail message and optional exception that was
88 * raised while loading the class.
90 * @param s the detail message
91 * @param ex the exception that was raised while loading the class
94 public ClassNotFoundException(String s, Throwable ex) {
95 super(s, null); // Disallow initCause
100 * Returns the exception that was raised if an error occurred while
101 * attempting to load the class. Otherwise, returns <tt>null</tt>.
103 * <p>This method predates the general-purpose exception chaining facility.
104 * The {@link Throwable#getCause()} method is now the preferred means of
105 * obtaining this information.
107 * @return the <code>Exception</code> that was raised while loading a class
110 public Throwable getException() {
115 * Returns the cause of this exception (the exception that was raised
116 * if an error occurred while attempting to load the class; otherwise
119 * @return the cause of this exception.
122 public Throwable getCause() {