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Failed to load target servlet

  Asked By: Cameron    Date: Sep 13    Category: Java    Views: 1512
  

i have a little problem here
i've created a web project and included the itext.jar
and itext_xml.jar files [as a java library] into it
here's the source
www.lowagie.com/iText/download.html#download
and while i run that code on server


import java.io.IOException;
import javax.servlet.http.HttpServlet;
import java.util.Date;
import javax.servlet.http.*;
import javax.servlet.*;
import com.lowagie.text.*;
import com.lowagie.text.pdf.PdfWriter;
import com.lowagie.text.html.HtmlWriter;
public class Chap0105 extends HttpServlet {

public void doGet (HttpServletRequest request, HttpServletResponse response)
throws IOException, ServletException
{

// we retrieve the presentationtype
String presentationtype = request.getParameter("presentationtype");

// step 1
Document document = new Document();

try
{

// step 2: we set the ContentType and create an instance of the
corresponding Writer
if ("pdf".equals(presentationtype)) {
response.setContentType("application/pdf");
PdfWriter.getInstance(document, response.getOutputStream());
}
else if ("html".equals(presentationtype)) {
response.setContentType("text/html");
HtmlWriter.getInstance(document, response.getOutputStream());
}
else {

response.sendRedirect("www.lowagie.com/iText/tutorial/ch01.html#step2");
}

// step 3
document.open();

// step 4
document.add(new Paragraph(new Date().toString()));


}
catch(DocumentException de) {
/*de.printStackTrace();
System.err.println("document: " + de.getMessage());*/
}

// step 5: we close the document (the outputstream is also closed
internally)
document.close();

}
}
the WSAD says that

Error Message: Failed to load target servlet [Chap0105]
Error Code: 500
Target Servlet: Chap0105
Error Stack:
java.lang.NoClassDefFoundError: com/lowagie/text/DocumentException
at java.lang.Class.newInstance0(Native Method)
at java.lang.Class.newInstance(Class.java:254)
at java.beans.Beans.instantiate(Beans.java:213)
at java.beans.Beans.instantiate(Beans.java:57)
.............etc

why it keeps on tellin' me failed to load target servlet
while nearly the same code run in a java project

import java.io.FileOutputStream;
import java.io.IOException;
import com.lowagie.text.*;
import com.lowagie.text.pdf.PdfWriter;
public class Chap0101 {

public static void main(String[] args) {

System.out.println("Chapter 1 example 1: Hello World");

// step 1: creation of a document-object
Document document = new Document();

try {

// step 2:
// we create a writer that listens to the document
// and directs a PDF-stream to a file

PdfWriter.getInstance(document, new
FileOutputStream("Chap0101.pdf"));
System.out.println("koko2");

// step 3: we open the document
document.open();
System.out.println("koko3");
// step 4: we add a paragraph to the document
document.add(new Paragraph("pravoooooo"));
System.out.println("koko4");

}
catch(DocumentException de) {
System.err.println(de.getMessage());
}
catch(IOException ioe) {
System.err.println(ioe.getMessage());
}

// step 5: we close the document
document.close();
System.out.println("koko5");
}
}

that code run successfully on a java file while it doesn't on the servlet
here's the hole project source code
ads.osdn.com/\
ions=1,2
we'll need 2 files
1- itext-1.02.jar 749k
2- itext-xml-1.02.jar 23k

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