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Need help with Sax2

 
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<prompt>
D:\java_xml_examples\practice>java -Dcom.acme.xml.SAXDriver MySAXApp roses.xml
Exception in thread "main" java.lang.NoClassDefFoundError: org/xml/sax/helpers/D
efaultHandler
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)
</prompt>
<MySAXApp.java>
import java.io.FileReader;
import org.xml.sax.XMLReader;
import org.xml.sax.Attributes;
import org.xml.sax.InputSource;
import org.xml.sax.helpers.XMLReaderFactory;
import org.xml.sax.helpers.DefaultHandler;

public class MySAXApp extends DefaultHandler
{
public static void main (String args[])
throws Exception
{
XMLReader xr = XMLReaderFactory.createXMLReader();
MySAXApp handler = new MySAXApp();
xr.setContentHandler(handler);
xr.setErrorHandler(handler);
// Parse each file provided on the
// command line.
for (int i = 0; i < args.length; i++) {
FileReader r = new FileReader(args[i]);
xr.parse(new InputSource(r));
}
}

public MySAXApp ()
{
super();
}

////////////////////////////////////////////////////////////////////
// Event handlers.
////////////////////////////////////////////////////////////////////

public void startDocument ()
{
System.out.println("Start document");
}

public void endDocument ()
{
System.out.println("End document");
}

public void startElement (String uri, String name,
String qName, Attributes atts)
{
System.out.println("Start element: {" + uri + "}" + name);
}

public void endElement (String uri, String name, String qName)
{
System.out.println("End element: {" + uri + "}" + name);
}

public void characters (char ch[], int start, int length)
{
System.out.print("Characters: \"");
for (int i = start; i < start + length; i++) {
switch (ch[i]) {
case '\\':
System.out.print("\\\\");
break;
case '"':
System.out.print("\\\"");
break;
case '\n':
System.out.print("\\n");
break;
case '\r':
System.out.print("\\r");
break;
case '\t':
System.out.print("\\t");
break;
default:
System.out.print(ch[i]);
break;
}
}
System.out.print("\"\n");
}
}
</MySAXApp.java>
<roses.xml>
<?xml version="1.0"?>
<poem xmlns="http://www.megginson.com/ns/exp/poetry">
<title>Roses are Red</title>
<l>Roses are red,</l>
<l>Violets are blue;</l>
<l>Sugar is sweet,</l>
<l>And I love you.</l>
</poem>
</roses.xml>
 
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