I ran into a similar problem in trying to serve static content with tomcat,
tomcat had trouble retrieving dynamically created content unless it was
already in the webapp at start, at least that was my experience. Since
you're trying to create a jsp, why don't you create one jsp and pass it your
preview data, then return that to the user. Even if tomcat could serve newly
created jsp, i don't see why you'll create a .jsp page every time the user
hits a preview button, one jsp should do. Also you may want to look into
autoDeploy etc.. config properties, there are options you can enable to make
tomcat notice changes in servlet code (including jsp), I am not sure they
apply to newly added JSPs.

On 12/15/06, Carl <carl@(protected):
>
> Environment: Tomcat 5.5.17, Windows XP
>
> Background: I have a jsp page that contains a javascript rich text editor
> that I use to create snippets of HTML code that are stored in a database and
> later displayed on other pages. Since the snippets can contain some custom
> tags, I have a 'Preview' button that reads the snippet directly from the
> editor, reads a 'preview' jsp file from the file system, places the snippet
> in the correct place in the file, writes the 'preview' file with the snippet
> to a temporary file and opens a new window (using javascript) which requests
> the temporary page from Tomcat.
>
> Problem: I can see the newly created temporary file in the file system.
> I can open it with an editor and it is all good. But, Tomcat returns a 404
> error for approximately one minute and then will serve the page upon hitting
> only the refresh.
>
> Analysis: I suspect the system is holding onto the newly written file
> until it hits some timeout but I have tried everything I can think of to
> make certain the file has been 'released'. The relevent parts of the copy
> process:
>
>      try {
>
>    File tempFile = File.createTempFile("preview", ".jsp", new
> File("C:/projects/EtrakWebApp/web/jsp/tempfiles"));
>
>         // read the preview jsp
>    FileWriter fw = new FileWriter(tempFile);
>
>         File infile = new File(destinationDir+"preview.jsp");
>
>         if( infile.exists() )
>         {
>           FileReader fr = new FileReader(infile);
>
>           BufferedReader in = new BufferedReader(fr);
>
>           while(true)
>           {
>              String line = in.readLine();
>
>              if( line==null )
>                 break;
>
>              System.out.println("line "+line );
>
>              // insert the text
>              if( line.contains("insert_preview_text") )
>              {
>                 fw.write(previewText+"\n");
>              }
>              else {
>                 fw.write(line+"\n");
>              }
>           }
>
>           fr.close();
>           in.close();
>         }
>
>         fw.flush();
>         fw.close();
>   fw = null;
>      }
>      catch (FileNotFoundException fnf)
>      {
>         fnf.printStackTrace();
>      }
>      catch (Exception ex)
>      {
>         ex.printStackTrace();
>      }
>
>      return returnFileName;
> Anyone have any ideas?
>
> TIA,
>
> Carl Kabbe
>
>
>
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> Version: 7.1.409 / Virus Database: 268.15.19/587 - Release Date:
> 12/14/2006
>
>
>
>
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--
"talk trash and carry a small stick."
PAUL KRUGMAN (NYT)