NullPointerException.java

/*
 *  Licensed to the Apache Software Foundation (ASF) under one or more
 *  contributor license agreements.  See the NOTICE file distributed with
 *  this work for additional information regarding copyright ownership.
 *  The ASF licenses this file to You under the Apache License, Version 2.0
 *  (the "License"); you may not use this file except in compliance with
 *  the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */

package java.lang;

/**
 * Thrown when a program tries to access a field or method of an object or an
 * element of an array when there is no instance or array to use, that is if the
 * object or array points to {@code null}. It also occurs in some other, less
 * obvious circumstances, like a {@code throw e} statement where the {@link
 * Throwable} reference is {@code null}.
 */
public class NullPointerException extends RuntimeException {

    private static final long serialVersionUID = 5162710183389028792L;

    /**
     * Constructs a new {@code NullPointerException} that includes the current
     * stack trace.
     */
    public NullPointerException() {
    }

    /**
     * Constructs a new {@code NullPointerException} with the current stack
     * trace and the specified detail message.
     *
     * @param detailMessage
     *            the detail message for this exception.
     */
    public NullPointerException(String detailMessage) {
        super(detailMessage);
    }

}