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 program tries to access a field or method of an object or an
22 * element of an array when there is no instance or array to use, that is if the
23 * object or array points to {@code null}. It also occurs in some other, less
24 * obvious circumstances, like a {@code throw e} statement where the {@link
25 * Throwable} reference is {@code null}.
26 */
27public class NullPointerException extends RuntimeException {
28
29    private static final long serialVersionUID = 5162710183389028792L;
30
31    /**
32     * Constructs a new {@code NullPointerException} that includes the current
33     * stack trace.
34     */
35    public NullPointerException() {
36    }
37
38    /**
39     * Constructs a new {@code NullPointerException} with the current stack
40     * trace and the specified detail message.
41     *
42     * @param detailMessage
43     *            the detail message for this exception.
44     */
45    public NullPointerException(String detailMessage) {
46        super(detailMessage);
47    }
48
49}
50