[iText-questions] Problem with servlet and itext PDF Library

[Frankie Poon]

hi all,
i am new in JAVA...
What is the meaning of the following error??

pdf.java:57: unreported exception com.lowagie.text.DocumentException; must
be ca
ught or declared to be thrown
and my source code is under below!! 
/***************************************************/

import java.io.*; 
import javax.servlet.*;
import javax.servlet.http.*;
import com.lowagie.text.*;
import com.lowagie.text.pdf.*; 
			 
/**

**/

public class pdf extends HttpServlet
{
 public void doGet(HttpServletRequest request,
                   HttpServletResponse response)
     throws ServletException, IOException 
    {
	      
	     try{
			response.setContentType( "application/pdf" );      
   
			//PrintWriter out = response.getWriter();
   
   		// step 1: creation of a document-object
			Document document = new Document();

                        // step 2:
                        // we create a writer that listens to the document
                        // and directs a PDF-stream to a temporary buffer
        
                        ByteArrayOutputStream buffer = new ByteArrayOutputStream();
                        PdfWriter.getInstance( document, buffer );
                        // step 3: we open the document
                        document.open();
			// step 4: we add a paragraph to the document
			document.add(new Paragraph("Hello World"));
  			//STEP 5: add image by Frankie;
	    	Image gif = Image.getInstance("1.gif");
       	Image gif2 = Image.getInstance("2.gif");
          
           
           document.add(gif);
           document.add(gif2);
          
			//STEP 6: add table by Frankie
        

           Table Tablea = new Table(2,2);    // 2 rows, 2 columns

	    

           Tablea.addCell("id");
           Tablea.addCell("Name");
           Tablea.addCell("1234567");
           Tablea.addCell("Frankie");
           document.add(Tablea);      
    
       	//STEP 7: add HTML list by Frankie
			List list = new List(true, 20);

			ListItem listItem;

			list.setListSymbol("*");
	    
			list = new List(false, 20);

	        //list.setListSymbol(new Chunk("\u2022", FontFactory.getFont(FontFactory.COURIER, 12, Font.NORMAL)));

   	    listItem = new ListItem("TESTING HTML LIST ");

       	list.add(listItem);

                        document.add(list);
                        String text=new String("TEST");
        
			document.close();

                        // step 10: we output the writer as bytes to the response 
output
                        DataOutput output = new DataOutputStream( 
response.getOutputStream() );
                        byte[] bytes = buffer.toByteArray();
                        response.setContentLength(bytes.length);
                        for( int i = 0; i < bytes.length; i++ ) { output.writeByte( 
bytes[i] ); }
        }catch (IOException ignored) {}
        
        }
}
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