java.util.prefs importPreferences() throws InvalidPreferencesFormatException

jdk1.4 build 49

Test program throws on windows:

java.util.prefs.InvalidPreferencesFormatException: org.xml.sax.SAXParseException: Element "root" does not allow "node" here.

On solairs: BackingStoreException thrown

Test program:
---------------------------ExportImportTest.java---------------------

import java.util.prefs.*;
import java.util.*;
import java.io.*;

 
public class ExportImportTest {
    
    public static void main(String[] args) throws Exception {
   
        try {
           Preferences userRoot = Preferences.userRoot();
           
           Preferences ExportImportTest01 = userRoot.node("ExportImportTest01");
           ExportImportTest01.put("k11","v11");
          
           File userFile = new File("user01.pfs");
           FileOutputStream fos = new FileOutputStream(userFile);
           ExportImportTest01.exportNode(fos);
           fos.close();
           userRoot.flush();
           
           File userFile1 = new File("user01.pfs");
           FileInputStream fis1 = new FileInputStream(userFile1);
           userRoot.importPreferences(fis1);
     
           System.out.println("ExportImportTest01() Pass");
       } catch(Exception e) {
            System.out.println("Exception thrown = " + e);
           System.out.println("ExportImportTest01() Fail");
           e.printStackTrace();
       }
     }
 
}
-------------------------result on win-------------------------
 
H:\merlin\bugs\prefs\ExportNode>java ExportImportTest
Exception thrown = java.util.prefs.InvalidPreferencesFormatException: org.xml.sax.SAXParseException: Element "root" does not allow "node" here.
ExportImportTest01() Fail
java.util.prefs.InvalidPreferencesFormatException: org.xml.sax.SAXParseException: Element "root" does not allow "node" here.
        at java.util.prefs.XmlSupport.importPreferences(../../../src/share/classes/java/util/prefs/XmlSupport.java:161)
        at java.util.prefs.Preferences.importPreferences(../../../src/share/classes/java/util/prefs/Preferences.java:1108)
        at ExportImportTest.main(ExportImportTest.java:27)
Caused by: org.xml.sax.SAXParseException: Element "root" does not allow "node" here.
        at org.apache.crimson.parser.Parser2.error(Parser2.java:3008)
        at org.apache.crimson.parser.ValidatingParser$ChildrenValidator.consume(ValidatingParser.java:349)
        at org.apache.crimson.parser.Parser2.maybeElement(Parser2.java:1298)
        at org.apache.crimson.parser.Parser2.content(Parser2.java:1695)
        at org.apache.crimson.parser.Parser2.maybeElement(Parser2.java:1461)
        at org.apache.crimson.parser.Parser2.content(Parser2.java:1695)
        at org.apache.crimson.parser.Parser2.maybeElement(Parser2.java:1461)
        at org.apache.crimson.parser.Parser2.parseInternal(Parser2.java:499)
        at org.apache.crimson.parser.Parser2.parse(Parser2.java:304)
        at org.apache.crimson.parser.XMLReaderImpl.parse(XMLReaderImpl.java:433)
        at org.apache.crimson.jaxp.DocumentBuilderImpl.parse(DocumentBuilderImpl.java:173)
        at java.util.prefs.XmlSupport.load(../../../src/share/classes/java/util/prefs/XmlSupport.java:181)
        at java.util.prefs.XmlSupport.importPreferences(../../../src/share/classes/java/util/prefs/XmlSupport.java:152)
        ... 2 more
----------------------------------result on solaris-----------------------
javapro:/home/pande/merlin/bugs/prefs/ExportNode 88 % java ExportImportTest
Exception thrown = java.util.prefs.BackingStoreException: Couldn't get file lock.
ExportImportTest01() Fail
java.util.prefs.BackingStoreException: Couldn't get file lock.
        at java.util.prefs.FileSystemPreferences.sync(FileSystemPreferences.java:409)
        at java.util.prefs.FileSystemPreferences.flush(FileSystemPreferences.java:442)
        at ExportImportTest.main(ExportImportTest.java:23)
Couldn't flush user prefs: java.util.prefs.BackingStoreException: Couldn't get file lock.