jdk1.4 build47 not passing
jdk1.4 build46 pass

java.util.prefs Preferences removeNode()
 throws java.util.ConcurrentModificationException
----------------------------------------Test Program-------------------------

import java.util.prefs.*;
import java.util.*;
 
 
public class Test {
    
    public static void main(String[] args) throws Exception {
         
       try {
           Preferences userRoot = Preferences.userRoot();
           Preferences N1 = userRoot.node("N1");
           Preferences N2 = N1.node("N2");
           Preferences N3 = N2.node("N3");
           Preferences N4 = N2.node("N4");
           N2.removeNode();
           System.out.println("Test() Pass");
       } catch(Exception e) {
           System.out.println("Exception thrown = " + e);
           System.out.println("Test() Fail");
           e.printStackTrace();
       }
   }
}
-----------------------------------------------result---------------
 
H:\merlin\bugs\prefs\removeNode>java Test
Exception thrown = java.util.ConcurrentModificationException
Test() Fail
java.util.ConcurrentModificationException
        at java.util.HashMap$HashIterator.nextEntry(../../../src/share/classes/java/util/HashMap.java:724)
        at java.util.HashMap$ValueIterator.next(../../../src/share/classes/java/util/HashMap.java:753)
        at java.util.prefs.AbstractPreferences.removeNode2(../../../src/share/classes/java/util/prefs/AbstractPreferences.java:931)
        at java.util.prefs.AbstractPreferences.removeNode(../../../src/share/classes/java/util/prefs/AbstractPreferences.java:910)
        at Test.main(Test.java:17)