How to access XML packages in Applet?

Hi all,
I am new to XML.
I just found, in any Java Applet program, if I include a declartion from Java XML packages, like this.
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
Java will comiple, but when I try to run that java applet, I got an error message like this:
java.lang.NoClassDefFoundError: javax/xml/parsers/DocumentBuilderFactory
at LogoBounce.init(LogoBounce.java:23)
at sun.applet.AppletPanel.run(AppletPanel.java:344)
at java.lang.Thread.run(Thread.java:484)
I searched all the related posts in this forum and found two solutions.
1 One suggest to use
DocumentBuilderFactory factory = new com.sun.xml.parser.DocumentBuilderFactoryImpl();
but I suspect DocumentBuilderFactoryImpl() method is in old version Java XML. Because I can't find it in the lates API document.
2 Change the .Policy file
grant {
permission java.util.PropertyPermission "javax.xml.parsers.DocumentBuilderFactory", "read";
I tried this, but it dosen't work.
I am very sure my .jar file is installed correctly and my Classpath is correct. Because I can run sample examples provided by Sun. (they are all Appliction programs).
Can anyone give me a suggestion on this issue?
Thanks.

Say, doesn't this sound like the question in http://forum.java.sun.com/thread.jsp?thread=194313&forum=4&message=636602

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