1/*
2 *  Licensed to the Apache Software Foundation (ASF) under one or more
3 *  contributor license agreements.  See the NOTICE file distributed with
4 *  this work for additional information regarding copyright ownership.
5 *  The ASF licenses this file to You under the Apache License, Version 2.0
6 *  (the "License"); you may not use this file except in compliance with
7 *  the License.  You may obtain a copy of the License at
8 *
9 *     http://www.apache.org/licenses/LICENSE-2.0
10 *
11 *  Unless required by applicable law or agreed to in writing, software
12 *  distributed under the License is distributed on an "AS IS" BASIS,
13 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 *  See the License for the specific language governing permissions and
15 *  limitations under the License.
16 */
17
18package java.lang;
19
20/**
21 * Thrown when a class loader is unable to find a class.
22 */
23public class ClassNotFoundException extends ReflectiveOperationException {
24
25    private static final long serialVersionUID = 9176873029745254542L;
26
27    private Throwable ex;
28
29    /**
30     * Constructs a new {@code ClassNotFoundException} that includes the current
31     * stack trace.
32     */
33    public ClassNotFoundException() {
34        super((Throwable) null);
35    }
36
37    /**
38     * Constructs a new {@code ClassNotFoundException} with the current stack
39     * trace and the specified detail message.
40     *
41     * @param detailMessage
42     *            the detail message for this exception.
43     */
44    public ClassNotFoundException(String detailMessage) {
45        super(detailMessage, null);
46    }
47
48    /**
49     * Constructs a new {@code ClassNotFoundException} with the current stack
50     * trace, the specified detail message and the exception that occurred when
51     * loading the class.
52     *
53     * @param detailMessage
54     *            the detail message for this exception.
55     * @param exception
56     *            the exception which occurred while loading the class.
57     */
58    public ClassNotFoundException(String detailMessage, Throwable exception) {
59        super(detailMessage);
60        ex = exception;
61    }
62
63    /**
64     * Returns the exception which occurred when loading the class.
65     *
66     * @return Throwable the exception which occurred while loading the class.
67     */
68    public Throwable getException() {
69        return ex;
70    }
71
72    /**
73     * Returns the cause of this Throwable, or {@code null} if there is no
74     * cause.
75     *
76     * @return Throwable the receiver's cause.
77     */
78    @Override
79    public Throwable getCause() {
80        return ex;
81    }
82}
83