No output from Servlet

[Garrett Smith]

I have run the xsl test through FireFox (deer park, actually) and the xsl translates the xml to html fine, no issues.

However, when invoking a servlet, an empty response is sent. It's probably a simple mistake. Can you spot the issue?

package testola;
 
import javax.servlet.*;
import javax.servlet.http.*;
import javax.xml.transform.*;
import javax.xml.transform.*;
import java.net.*;
import java.io.*;
/**
 * This servlet performs a server-side XSLT transformation.
 *
 */
public class TestXSL extends HttpServlet {
 
public void doGet(final HttpServletRequest request, 
final HttpServletResponse response) 
throws ServletException, IOException {

String filename = request.getParameter("xml");
try {

TransformerFactory tFactory = TransformerFactory.newInstance();

Transformer transformer = tFactory.newTransformer
 (new javax.xml.transform.stream.StreamSource(getServletContext().getRealPath("/xslt/"+filename+".xslt")));

transformer.transform(
new javax.xml.transform.stream.StreamSource(getServletContext().getRealPath(filename+".xml")),
new javax.xml.transform.stream.StreamResult( filename+".html"));
}
catch (Exception e) {
throw new ServletException(e);
}
}


// call doGet. 
public void doPost(final HttpServletRequest request, 
final HttpServletResponse response) 
throws ServletException, IOException {
doGet(request, response);
}
}  

[ July 29, 2005: Message edited by: Garrett Smith ]

[Ulf Dittmer]

I'm not 100% familiar with Trax, but it looks like you are creating an HTML file as result of your transform. After all processing is done, you would need to redirect to that HTML file using response.sendRedirect(...). Make sure that the transform() method doesn't return until all processing is done.
[ July 30, 2005: Message edited by: Ulf Dittmer ]

[Garrett Smith]

Method transform is void.

 
transform
 
public abstract void transform(Source xmlSource,
                               Result outputTarget)
                        throws TransformerException
 
    Process the source tree to the output result.
 
    Parameters:
        xmlSource - The input for the source tree.
        outputTarget - The output target. 
    Throws:
        TransformerException - If an unrecoverable error occurs during the course of the transformation.
 
 

http://java.sun.com/j2se/1.4.2/docs/api/javax/xml/transform/Transformer.html
[ July 30, 2005: Message edited by: Garrett Smith ]

[William Brogden]

I would certainly make a separate reference to that output stream so it can be close()ed to ensure that the output buffer is flushed. I have had several mystery "no output" problems that were solved that way.
Bill

[Garrett Smith]

Changed, but same result (blank pg).

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

String filename = request.getParameter("xml");
try {

TransformerFactory tFactory = TransformerFactory.newInstance();

[B]StreamSource xsl = new StreamSource(getServletContext().getRealPath("/xslt/"+filename+".xslt"));
StreamSource xml = new StreamSource(getServletContext().getRealPath(filename+".xml"));
StreamResult html = new StreamResult( new File(getServletContext().getRealPath(filename+".html")));[/B]
Transformer transformer = tFactory.newTransformer(xsl);

transformer.transform(xml, html);
}
catch (Exception e) {
e.printStackTrace();
throw new ServletException(e);
}
}
 

[ July 30, 2005: Message edited by: Garrett Smith ]

[Ulf Dittmer]

You don't receive a response because none is generated - reread what I posted earlier.

[Garrett Smith]

response.sendRedirect(getServletContext().getRealPath(filename+".html"));
 

I get 404. The file does not exist.

[Garrett Smith]

Oh, I was stupid. I made it work now.

  
request.getRequestDispatcher(filename+".html").include(request, response);

you were right ulf. Thanks.