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Commons.Lang, a package of Java utility classes for the classes that are in java.lang's hierarchy, or are considered to be so standard as to justify existence in java.lang.

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/*
 * Copyright 2002-2005 The Apache Software Foundation.
 * 
 * Licensed 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 org.apache.commons.lang;

/**
 * Thrown to indicate that an argument was null and should
 * not have been.
 * This exception supplements the standard IllegalArgumentException
 * by providing a more semantically rich description of the problem.
 * 
 * NullArgumentException represents the case where a method takes
 * in a parameter that must not be null.
 * Some coding standards would use NullPointerException for this case,
 * others will use IllegalArgumentException.
 * Thus this exception would be used in place of
 * IllegalArgumentException, yet it still extends it.
 * 
 *  * public void foo(String str) {
 *   if (str == null) {
 *     throw new NullArgumentException("str");
 *   }
 *   // do something with the string
 * }
 * 
 * 
 * @author Matthew Hawthorne
 * @author Stephen Colebourne
 * @since 2.0
 * @version $Id: NullArgumentException.java 161243 2005-04-14 04:30:28Z ggregory $
 */
public class NullArgumentException extends IllegalArgumentException {

   /**
    * Instantiates with the given argument name.
    *
    * @param argName  the name of the argument that was null.
    */
    public NullArgumentException(String argName) {
        super((argName == null ? "Argument" : argName) + " must not be null.");
    }

}