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Date: Wed, 22 Feb 2006 15:17:38 +0100 (CET)
From: "Tim Ellison (JIRA)" <jira@apache.org>
To: harmony-dev@incubator.apache.org
Subject: [jira] Assigned: (HARMONY-94)
 java.util.Collections.binarySearch(List, Object, Comparator c) throws NPE
 when c is null
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     [ http://issues.apache.org/jira/browse/HARMONY-94?page=all ]

Tim Ellison reassigned HARMONY-94:
----------------------------------

    Assign To: Tim Ellison

> java.util.Collections.binarySearch(List, Object, Comparator c) throws NPE when c is null
> ----------------------------------------------------------------------------------------
>
>          Key: HARMONY-94
>          URL: http://issues.apache.org/jira/browse/HARMONY-94
>      Project: Harmony
>         Type: Bug
>   Components: Classlib
>     Reporter: Svetlana Samoilenko
>     Assignee: Tim Ellison

>
> According to j2se 1.4.2 and 1.5 specification for java.util.Collections.binarySearch(List, Object, Comparator c) method null value of Comparator c indicates, that the elements' natural ordering should be used.
> Harmony throws NPE in this case that contradicts specification.
> Code to reproduce: 
> import java.util.*; 
> public class test2 {          
> public static void main(String args[]){ 
>         LinkedList lst = new LinkedList(); 
>         lst.add(new Integer(30)); 
>         Collections.sort(lst, null); 
>         int i = Collections.binarySearch(lst, new Integer(2), null); 
>         System.out.println("Index of search key =" + i); 
>     } 
> }
> Steps to Reproduce: 
> 1. Build Harmony (check-out on 2006-01-30) j2se subset as described in README.txt. 
> 2. Compile test2.java using BEA 1.4 javac 
> > javac -d . test2.java 
> 3. Run java using compatible VM (J9) 
> > java -showversion test2
> Output: 
> C:\tmp>C:\jrockit-j2sdk1.4.2_04\bin\java.exe -showversion test2 
> java version "1.4.2_04" 
> Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.2_04-b05) 
> BEA WebLogic JRockit(TM) 1.4.2_04 JVM (build ari-31788-20040616-1132-win-ia32, Native Threads, GC strategy: parallel) 
> Index of search key =-1
> C:\tmp>C:\harmony\trunk\deploy\jre\bin\java -showversion test2 
> (c) Copyright 1991, 2005 The Apache Software Foundation or its licensors, as applicable. 
> java.lang.NullPointerException
>         at java.util.Collections.binarySearch(Collections.java:1347)
>         at test2.main(test2.java:8)
>  Suggected fix:
> Index: trunk/modules/luni/src/main/java/java/util/Collections.java
> ===================================================================
> ---   trunk/modules/luni/src/main/java/java/util/Collections.java       (revision 377385)
> +++ trunk/modules/luni/src/main/java/java/util/Collections.java      (working copy)
> @@ -1340,6 +1340,9 @@
>              */
>             public static int binarySearch(List list, Object object,
>                                     Comparator comparator) {
> +                if ( comparator== null) {
> +                    return Collections.binarySearch(list, object);
> +                }
>                         if (!(list instanceof RandomAccess)) {
>                                     ListIterator it = list.listIterator();
>                                     while (it.hasNext()) {                                    
>  Suggested junit test case:
> ------------------------ CollectionsTest.java ------------------------------------------------- 
> import junit.framework.*; 
> import java.util.*; 
> public class CollectionsTest extends TestCase { 
>     public static void main(String[] args) { 
>         junit.textui.TestRunner.run(CollectionsTest.class); 
>     } 
>     public void test_binarySearch () { 
>         LinkedList lst = new LinkedList(); 
>         lst.add(new Integer(30)); 
>         Collections.sort(lst, null); 
>         assertEquals(-1, Collections.binarySearch(lst, new Integer(2), null));
>     } 
> }

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