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From "Anton Luht (JIRA)" <j...@apache.org>
Subject [jira] Created: (HARMONY-839) WeakHashMap(Map arg) throws NPE if arg.entrySet() returns null
Date Tue, 11 Jul 2006 16:29:29 GMT
WeakHashMap(Map arg) throws NPE if arg.entrySet() returns null
--------------------------------------------------------------

         Key: HARMONY-839
         URL: http://issues.apache.org/jira/browse/HARMONY-839
     Project: Harmony
        Type: Bug

  Components: Non-bug differences from RI  
 Environment: Windows XP
    Reporter: Anton Luht
    Priority: Trivial
 Attachments: patch.txt

VM + Classlib version 420749

Problem:

If we create a Map with entrySet() method that return null, WeakHashMap constructor with it
won't throw NPE in RI but will in Harmony.

Code to reproduce:

import java.util.*;
public class Test  {
 public static void main (String[] args) {                 
          Map localMap = new TestMap();
          new WeakHashMap(localMap);
    } 
} 

class TestMap implements Map {
                        public void clear() {
                                    return;
                        }
                        public boolean containsKey(Object p0) {
                                    return false;
                        }
                        public boolean containsValue(Object p0) {
                                    return false;
                        }
                        public Set entrySet() {
                                    return null;
                        }
                        public boolean equals(Object p0) {
                                    return false;
                        }
                        public Object get(Object p0) {
                                    return null;
                        }
                        public int hashCode() {
                                    return 0;
                        }
                        public boolean isEmpty() {
                                    return false;
                        }
                        public Set keySet() {
                                    return null;
                        }
                        public Object put(Object p0, Object p1) {
                                    return null;
                        }
                        public void putAll(Map p0) {
                                    return;
                        }
                        public Object remove(Object p0) {
                                    return null;
                        }
                        public int size() {
                                    return 0;
                        }
                        public Collection values() {
                                    return null;
                        }
            }


Output in RI: none

Output in Harmony:

java.lang.NullPointerException
        at java.util.AbstractMap.putAll(AbstractMap.java:282)
        at java.util.WeakHashMap.<init>(WeakHashMap.java:231)
        at Test.main(Test.java:5)

Please see the unit test for this issue + patch to fix it attached



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