error:package com.sun.xml.internal.ws.util.xml does not exist

[Whizz Kid]

I currently use netbeans and am working with an xml file with sax.My code is :\[code\] DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance(); DocumentBuilder db = dbf.newDocumentBuilder(); Document doc = db.parse("c:/as.xml"); doc.getDocumentElement().normalize(); Element staff =doc.createElement("staff") ; Element name =doc.createElement("name") ; name.setTextContent(new CDATA("<div> this is a test </div>").getText()) ; staff.appendChild(name) ; doc.getDocumentElement().appendChild(staff) ; OutputFormat format = new OutputFormat( doc); format.setIndenting(true); XMLSerializer serializer = new XMLSerializer( new FileOutputStream(new File("c:/as.xml")), format); serializer.serialize(doc); \[/code\]My program runs correctly but when I clean and build this project get this error:\[quote\] 1-C:\p1\src\javaapplication1\XMLHandler.java:13: package com.sun.xml.internal.ws.util.xml does not exist import com.sun.xml.internal.ws.util.xml.CDATA;\[/quote\]and get this warnings :\[quote\] 1- C:\p1\src\javaapplication1\XMLHandler.java:11: warning: com.sun.org.apache.xml.internal.serialize.OutputFormat is Sun proprietary API and may be removed in a future release import com.sun.org.apache.xml.internal.serialize.OutputFormat; 2-C:\p1\src\javaapplication1\XMLHandler.java:12: warning: com.sun.org.apache.xml.internal.serialize.XMLSerializer is Sun proprietary API and may be removed in a future release import com.sun.org.apache.xml.internal.serialize.XMLSerializer;\[/quote\]Please help me.