this is killing me - NoClassDefFoundError

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All I'm trying to do is try out Xerces. When I run my program it complains: Exception in thread "main" java.lang.NoClassDefFoundError: org/xml/sax/SAXException   I just don't get what I'm doing wrong.   This is how I build: c:\jdk1.3\bin\javac  -classpath c:\jdk1.3\xerces-1_3_0\xerces.jar  Dommy.java   And this is how I run: set CLASSPATH= c:\jdk1.3\bin\java Dommy -jar c:\jdk1.3\xerces-1_3_0\xerces.jar   Anyone have any ideas? Thanks.   import org.apache.xerces.parsers.DOMParser; import org.w3c.dom.Document; import org.xml.sax.SAXException; import java.io.IOException;   public class Dommy {  public Dommy()  {   String xmlFile = "file:map.xml";     DOMParser parser = new DOMParser();     try {       parser.parse(xmlFile);      } catch (SAXException se) {       se.printStackTrace();   } catch (IOException ioe) {       ioe.printStackTrace();   }     Document document = parser.getDocument();  }    public static void main(String args[])  {   Dommy t = new Dommy();  } }