Gui xalan xml

Question

I am trying to program a java swing gui with one button that will
transform old.xml to new.xml using transform.xsl using xalan
but the compiler gives an error message:
Transform2.java:53: unreported exception javax.xml.transform.TransformerException; must be caught or declared to be thrown
transformation("hamlet.xml","transformation1.xsl","hamletnew.xml"
anyone know the solution of this problem
this is the complete code:
//using apache xalan to transform old.xml with tranform.xsl into new.xml
//with java swing gui
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerConfigurationException;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.stream.StreamResult;
import javax.xml.transform.stream.StreamSource;
public class Transform2
public static void main(String[] args)throws TransformerException, TransformerConfigurationException,FileNotFoundException, IOException
JFrame frame = new JFrame("Event Handling Tombol & TextField");
final JButton button = new JButton("Transform");
ActionListener eventclick =
new ActionListener() {
public void actionPerformed(ActionEvent e) {
if (e.getSource() == button) {
transformation("old.xml","transform.xsl","new.xml");
button.addActionListener(eventclick);
frame.getContentPane().setLayout(new FlowLayout());
frame.getContentPane().add(button);
frame.pack();
frame.setVisible(true);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
private static void transformation(String inputfile,String xslfile,String outputfile)throws TransformerException, TransformerConfigurationException,FileNotFoundException, IOException
// Use the static TransformerFactory.newInstance() method to instantiate
// a TransformerFactory. The javax.xml.transform.TransformerFactory
// system property setting determines the actual class to instantiate --
// org.apache.xalan.transformer.TransformerImpl.
TransformerFactory tFactory = TransformerFactory.newInstance();
// Use the TransformerFactory to instantiate a Transformer that will work with
// the stylesheet you specify. This method call also processes the stylesheet
// into a compiled Templates object.
Transformer transformer = tFactory.newTransformer(new StreamSource(xslfile));
// Use the Transformer to apply the associated Templates object to an XML document
// (foo.xml) and write the output to a file (foo.out).
transformer.transform(new StreamSource(inputfile), new StreamResult(new FileOutputStream(outputfile)));

Answer 1

Function
private static void transformation(String inputfile,String xslfile,String outputfile)throws TransformerException, TransformerConfigurationException,FileNotFoundException, IOExceptionStates that that function might throw an on of the exceptions mentioned.. to do this you have to have
try{
   //the code that this function should do...
catch(Exception e)
    // if doing previous stuff fails... this will be executed.
    // here do the throwing..
    throw new IOException (this);
}also the main function propably should not throw exceptions..
P_s