code: // from gee.cs.oswego.edu/home/jsr166/jsr166
  
  package jsr166tests.jtreg.util.Collections;
  
  /*
   * Copyright 1999 Sun Microsystems, Inc.  All Rights Reserved.
   * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   *
   * This code is free software; you can redistribute it and/or modify it
   * under the terms of the GNU General Public License version 2 only, as
   * published by the Free Software Foundation.
   *
   * This code is distributed in the hope that it will be useful, but WITHOUT
   * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
   * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
   * version 2 for more details (a copy is included in the LICENSE file that
   * accompanied this code).
   *
   * You should have received a copy of the GNU General Public License version
   * 2 along with this work; if not, write to the Free Software Foundation,
   * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
   *
   * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
   * CA 95054 USA or visit www.sun.com if you need additional information or
   * have any questions.
   */
  
  /*
   * @test
   * @bug 4189641
   * @summary Wrapping a null collection/array should blow up sooner
   *          rather than later
   */
  
  import java.util.*;
  
  public class WrappedNull {
        public static void main(String argv[]) throws Exception {
            boolean testSucceeded = false;
            try{
                List l = Arrays.asList(null);
            }
            catch (NullPointerException e) {
                testSucceeded = true;
            }
            if(!testSucceeded)
                throw new Exception("Arrays.asList");
  
            testSucceeded = false;
            try{
                Collection c = Collections.unmodifiableCollection(null);
            }
            catch (NullPointerException e) {
                testSucceeded = true;
            }
            if(!testSucceeded)
                throw new Exception("unmodifiableCollection");
  
            testSucceeded = false;
            try{
                Set c = Collections.unmodifiableSet(null);
            }
            catch (NullPointerException e) {
                testSucceeded = true;
            }
            if(!testSucceeded)
                throw new Exception("unmodifiableSet");
  
            testSucceeded = false;
            try{
                List c = Collections.unmodifiableList(null);
            }
            catch (NullPointerException e) {
                testSucceeded = true;
            }
            if(!testSucceeded)
                throw new Exception("unmodifiableList");
  
            testSucceeded = false;
            try{
                Map c = Collections.unmodifiableMap(null);
            }
            catch (NullPointerException e) {
                testSucceeded = true;
            }
            if(!testSucceeded)
                throw new Exception("unmodifiableMap");
  
            testSucceeded = false;
            try{
                SortedSet c = Collections.unmodifiableSortedSet(null);
            }
            catch (NullPointerException e) {
                testSucceeded = true;
            }
            if(!testSucceeded)
                throw new Exception("unmodifiableSortedSet");
  
            testSucceeded = false;
            try{
                SortedMap c = Collections.unmodifiableSortedMap(null);
            }
            catch (NullPointerException e) {
                testSucceeded = true;
            }
            if(!testSucceeded)
                throw new Exception("unmodifiableSortedMap");
  
            testSucceeded = false;
            try{
                Collection c = Collections.synchronizedCollection(null);
            }
            catch (NullPointerException e) {
                testSucceeded = true;
            }
            if(!testSucceeded)
                throw new Exception("synchronizedCollection");
  
            testSucceeded = false;
            try{
                Set c = Collections.synchronizedSet(null);
            }
            catch (NullPointerException e) {
                testSucceeded = true;
            }
            if(!testSucceeded)
                throw new Exception("synchronizedSet");
  
            testSucceeded = false;
            try{
                List c = Collections.synchronizedList(null);
            }
            catch (NullPointerException e) {
                testSucceeded = true;
            }
            if(!testSucceeded)
                throw new Exception("synchronizedList");
  
            testSucceeded = false;
            try{
                Map c = Collections.synchronizedMap(null);
            }
            catch (NullPointerException e) {
                testSucceeded = true;
            }
            if(!testSucceeded)
                throw new Exception("synchronizedMap");
  
            testSucceeded = false;
            try{
                SortedSet c = Collections.synchronizedSortedSet(null);
            }
            catch (NullPointerException e) {
                testSucceeded = true;
            }
            if(!testSucceeded)
                throw new Exception("synchronizedSortedSet");
  
            testSucceeded = false;
            try{
                SortedMap c = Collections.synchronizedSortedMap(null);
            }
            catch (NullPointerException e) {
                testSucceeded = true;
            }
            if(!testSucceeded)
                throw new Exception("synchronizedSortedMap");
  
            // Make sure that non-null arguments don't throw exc.
            List l = Arrays.asList(new Object[0]);
            Collection c = Collections.unmodifiableCollection(
                               Collections.EMPTY_SET);
            Set s = Collections.unmodifiableSet(Collections.EMPTY_SET);
            l = Collections.unmodifiableList(Collections.EMPTY_LIST);
            Map m = Collections.unmodifiableMap(Collections.EMPTY_MAP);
            SortedSet ss = Collections.unmodifiableSortedSet(new TreeSet());
            SortedMap sm = Collections.unmodifiableSortedMap(new TreeMap());
  
            c = Collections.synchronizedCollection(Collections.EMPTY_SET);
            s = Collections.synchronizedSet(Collections.EMPTY_SET);
            l = Collections.synchronizedList(Collections.EMPTY_LIST);
            m = Collections.synchronizedMap(Collections.EMPTY_MAP);
            ss = Collections.synchronizedSortedSet(new TreeSet());
            sm = Collections.synchronizedSortedMap(new TreeMap());
        }
  }
  