Source code: java/lang/ClassNotFoundException.java
1 /* ClassNotFoundException.java -- thrown when class definition cannot be found
2 Copyright (C) 1998, 2002, 2005 Free Software Foundation, Inc.
3
4 This file is part of GNU Classpath.
5
6 GNU Classpath is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2, or (at your option)
9 any later version.
10
11 GNU Classpath is distributed in the hope that it will be useful, but
12 WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 General Public License for more details.
15
16 You should have received a copy of the GNU General Public License
17 along with GNU Classpath; see the file COPYING. If not, write to the
18 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
19 02110-1301 USA.
20
21 Linking this library statically or dynamically with other modules is
22 making a combined work based on this library. Thus, the terms and
23 conditions of the GNU General Public License cover the whole
24 combination.
25
26 As a special exception, the copyright holders of this library give you
27 permission to link this library with independent modules to produce an
28 executable, regardless of the license terms of these independent
29 modules, and to copy and distribute the resulting executable under
30 terms of your choice, provided that you also meet, for each linked
31 independent module, the terms and conditions of the license of that
32 module. An independent module is a module which is not derived from
33 or based on this library. If you modify this library, you may extend
34 this exception to your version of the library, but you are not
35 obligated to do so. If you do not wish to do so, delete this
36 exception statement from your version. */
37
38
39 package java.lang;
40
41 /**
42 * Thrown when a class is requested by reflection, but the class definition
43 * cannot be found. This exception is often chained from another Throwable.
44 *
45 * @author Brian Jones
46 * @author Eric Blake (ebb9@email.byu.edu)
47 * @see Class#forName(String)
48 * @see ClassLoader#findSystemClass(String)
49 * @see ClassLoader#loadClass(String, boolean)
50 * @status updated to 1.4
51 */
52 public class ClassNotFoundException extends Exception
53 {
54 /**
55 * Compatible with JDK 1.0+.
56 */
57 private static final long serialVersionUID = 9176873029745254542L;
58
59 /**
60 * The cause of this exception (duplicates the one stored in Throwable).
61 *
62 * @serial the exception cause
63 * @since 1.2
64 */
65 private final Throwable ex;
66
67 /**
68 * Create an exception without a message. Note that this initializes the
69 * cause to null.
70 */
71 public ClassNotFoundException()
72 {
73 this(null, null);
74 }
75
76 /**
77 * Create an exception with a message. Note that this initializes the
78 * cause to null.
79 *
80 * @param s the message
81 */
82 public ClassNotFoundException(String s)
83 {
84 this(s, null);
85 }
86
87 /**
88 * Create an exception with a message and chain it to the exception
89 * which occurred while loading the class.
90 *
91 * @param s the message
92 * @param ex the chained exception
93 * @since 1.2
94 */
95 public ClassNotFoundException(String s, Throwable ex)
96 {
97 super(s, ex);
98 this.ex = ex;
99 }
100
101 /**
102 * Returns the exception which occurred while loading the class,
103 * otherwise returns null. This is a legacy method; the preferred choice
104 * now is {@link Throwable#getCause()}.
105 *
106 * @return the cause of this exception
107 * @since 1.2
108 */
109 public Throwable getException()
110 {
111 return ex;
112 }
113
114 /**
115 * Returns the exception which occurred while loading the class,
116 * otherwise returns null.
117 *
118 * @return the cause of this exception
119 * @since 1.4
120 */
121 public Throwable getCause()
122 {
123 return ex;
124 }
125 }