Need Hellp!! problem with org.apache.struts.actions.DownloadAction.copy

Hello All,

I am facing a problem in my application when it is being deployed on server where we are using tomcat, application runs fine on localhost. I am using struts for developing the application.

In one part of the application I am extending org.apache.struts.actions.DownloadAction class to download a file which is present on the server.

but it throws this exception

exception

javax.servlet.ServletException
org.apache.struts.action.RequestProcessor.processE xception(RequestProcessor.java:523)
org.apache.struts.action.RequestProcessor.processA ctionPerform(RequestProcessor.java:421)
org.apache.struts.action.RequestProcessor.process( RequestProcessor.java:224)
org.apache.struts.action.ActionServlet.process(Act ionServlet.java:1194)
org.apache.struts.action.ActionServlet.doGet(Actio nServlet.java:414)
javax.servlet.http.HttpServlet.service(HttpServlet .java:627)
javax.servlet.http.HttpServlet.service(HttpServlet .java:729)


root cause

java.lang.NullPointerException
org.apache.struts.actions.DownloadAction.copy(Down loadAction.java:139)
org.apache.struts.actions.DownloadAction.execute(D ownloadAction.java:112)
org.apache.struts.action.RequestProcessor.processA ctionPerform(RequestProcessor.java:419)
org.apache.struts.action.RequestProcessor.process( RequestProcessor.java:224)
org.apache.struts.action.ActionServlet.process(Act ionServlet.java:1194)
org.apache.struts.action.ActionServlet.doGet(Actio nServlet.java:414)
javax.servlet.http.HttpServlet.service(HttpServlet .java:627)
javax.servlet.http.HttpServlet.service(HttpServlet .java:729)


my action class goes like this...

Code Java:

---

import java.io.File;
 
import javax.servlet.ServletContext;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
 
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.actions.DownloadAction;
import org.apache.struts.actions.DownloadAction.ResourceStreamInfo;
import org.apache.struts.actions.DownloadAction.StreamInfo;
 
import javax.servlet.http.HttpSession;
import forms.UploadFileForm;
 
public class DownloadMagazineAction extends DownloadAction
{
protected StreamInfo getStreamInfo(ActionMapping mapping,ActionForm form,HttpServletRequest request,HttpServletResponse response)throws Exception
{
String filepath = null;
String foldername = null;
 
HttpSession session = request.getSession(true);
 
UploadFileForm uploadform = (UploadFileForm) form;
 
 
System.out.println("sesssion month and year in download action is " + session.getAttribute("month")+ session.getAttribute("year"));
foldername = (String)session.getAttribute("month") + session.getAttribute("year");
System.out.println("folder name from session : " + foldername);
 
String fileName = request.getParameter("filename");
System.out.println("filename : " + fileName);
 
filepath = "Magazine_" + foldername + "/" + fileName;
System.out.println("Filepath : " + filepath);
 
File file = new File(filepath);
 
String name = file.getName();
 
 
String contentType = "application/octet-stream";
response.setHeader("Content-disposition", "attachment; filename=" + name);
response.setHeader("Pragma", "no-cache"); 
 
ServletContext application = servlet.getServletContext();
System.out.println("application : " + application);
 
 
return new ResourceStreamInfo(contentType, application, filepath);
}
}

---

I was taking the month and year from the form object but to see if the problem is because of the form I changed the same to session and tried to get the data from session variable. But still it is not working.

I dnt know from where this DownloadAction.copy is generated and why is the application giving error after deployment and not at server :(

can somebody please help me out with this problem... I am tryig to get rid of this from last so many days but have not got any success :(
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Is there any body who can help me out??