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Problems with setting up Xerces

• To: xml-dev@l...
• Subject: Problems with setting up Xerces
• From: Javier Ho <hochokchiat@y...>
• Date: Wed, 28 Nov 2001 10:05:30 +0800 (CST)
• Reply-to: JavierHo@b...

Hi everyone =)

I wrote a simple parser for xml using SAX. there is no
problem at compilation time. when i run the program
however, the following error is generated:

Exception in thread "main"
java.lang.NoClassDefFoundError:
org/xml/sax/helpers/DefaultHandler
        at java.lang.ClassLoader.defineClass0(Native
Method)
        at java.lang.ClassLoader.defineClass(Unknown
Source)
        at
java.security.SecureClassLoader.defineClass(Unknown
Source)
        at java.net.URLClassLoader.defineClass(Unknown
Source)
        at java.net.URLClassLoader.access$100(Unknown
Source)
        at java.net.URLClassLoader$1.run(Unknown
Source)
        at
java.security.AccessController.doPrivileged(Native
Method)
        at java.net.URLClassLoader.findClass(Unknown
Source)
        at java.lang.ClassLoader.loadClass(Unknown
Source)
        at
sun.misc.Launcher$AppClassLoader.loadClass(Unknown
Source)
        at java.lang.ClassLoader.loadClass(Unknown
Source)
        at
java.lang.ClassLoader.loadClassInternal(Unknown
Source)


If there's anyone who can provide me with some clues
to what this error is, thank you so much beccause i've
been working on it for a week and have followed the
installation in setting classpath. have even tried to
install it as an extension to java. none of it work.

here is my java source code. Please enlighten me on
any semantic errors that might have caused the runtime
error.

Thank you so much folks!!


import java.io.*;
import org.xml.sax.*;
import org.xml.sax.helpers.DefaultHandler;
import javax.xml.parsers.SAXParserFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.parsers.SAXParser;

public class Echo extends DefaultHandler
{	private static Writer out;
	
	public static void main(String[] args)
	{
		if(args.length != 1) {
			System.out.println("Usage: cmd filename");
			System.exit(1);
		}
				
		//use an instance of ourselves as an SAX event
handler
		DefaultHandler handler = new Echo();
		
		//use the default(non-validating) parser
		SAXParserFactory factory =
SAXParserFactory.newInstance();
				
		try {
			//set up output stream	
			out = new OutputStreamWriter(System.out, "UTF8");
			
			//parse the input
			SAXParser saxParser = factory.newSAXParser();
			saxParser.parse(new File(args[0]), handler);							
				
		} catch(Throwable t) {
			t.printStackTrace();
		}
		
		System.exit(0);
	}
	
	private void emit(String s) throws SAXException
	{
		try {
			out.write(s);
			out.flush();
		} catch(IOException e) {
			throw new SAXException("IO Error", e);
		}
	}
	
	private void nl() throws SAXException
	{
		String lineEnd =
System.getProperty("line.seperator");
			
		try {
			out.write(lineEnd);
		} catch(IOException e) {
			throw new SAXException("IO Error", e);
		}
	}
	
	public void startDocument() throws SAXException
	{
		emit("<?xml version='1.0' encoding='UTF-8'?>");
		nl();
	}
	
	public void endDocument() throws SAXException
	{
		try {
			nl();
			out.flush();
		} catch(IOException e) {
			throw new SAXException("IO Error", e);
		}
	}
	
	public void startElement(String namespaceURI, String
sName, String qName,
							 Attributes attrs)
	throws SAXException
	{
		String eName = sName;
		if("".equals(eName))	//qualified name
			eName = qName;
		
		emit("<" + eName);
		if(attrs != null) {
			for(int i = 0; i < attrs.getLength(); i++) {
				String aName = attrs.getLocalName(i);	//attribute
name
				if("".equals(aName))
					aName = attrs.getQName(i);
				emit(" ");
				emit(aName + "=\"" + attrs.getValue(i) + "\"");
			}
		}
		emit(">");
	}
	
	public void endElement(String namespaceURI, String
sName, String qName)
	throws SAXException
	{
		emit("<" + sName + ">");
	}
	
	public void characters(char buf[], int offset, int
len) throws SAXException
	{
		String s = new String(buf, offset, len);
		emit(s);
	}
}	

rgds,
Javier

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