error locating file in servlet

I am trying to download a file from a servlet.
Ive put in all my codes but i keep getting a "error locating requested file" error in DAP, with the URL of the file.
Is there anything that can be done?
thanks

Please read this.

Well i'm sorry for not beein explanatory enough.
this is my get method for downloading my attachments

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

String filename=request.getParameter("filename");
File f=new File("C:/TEMP"+"/"+filename);
FileInputStream input=new FileInputStream(f);
BufferedInputStream in = null;
try{
in = new BufferedInputStream(input);
response.setContentType(CONTENT_TYPE);
response.setHeader("Content-Disposition"," inline; filename=" + filename);
ServletOutputStream out = response.getOutputStream();

byte[] buffer = new byte[4 * 1024];
int data;
while((data = in.read(buffer)) != -1){
out.write(buffer, 0, data); }
out.flush();}
catch(Exception e){
return; }

}

filename is a parameter sent from my jsp page to the servlet via url rewriting. When i click on the link representing the file to be downloaded, DAP tells me "proxy cannot find requested file"
Also C:\TEMP is the folder that i upload my files to.

DAP tells me "proxy cannot find requested file"

What is DAP?
Is that a 404 error coming from the server?
Are you sure you're even hitting that servlet?
What are you seeing in the server's logs?

DAP is download accelerator Plus, it helps me manage my downloads.
And im not so sure if im hitting the servlet cus i once out a println statement to print the parameter, and it didnt show. but the servlet name is called showattachments and the url from the preceeding jsp is like this

<a href="showattachments?filename=<%=f.getName()%>"><%=f.getName()%></a>

so it should hit the servlet but maybe it isnt.

im using JBuilder IDE so i dont know where to find my server logs though ive looked.