commandButton behaviour differs to commandLink

[CarlHowarth <ca...@dlapiper.com>]

Hello there,

Hopefully someone can help - I have looked through the existing queries and
can't just find what I'm after. I have posted this to users but to no avail,
please could somebody confirm if this is a bug in the software or if I'm
doing something incorrectly?

I have a main record with asociated files - the files are uploaded through
my web app and are downloaded from the same page that lists the files in a
dataTable. I have a series of commandLinks that display the file names - a
user selects the file and it downloads.

The problem I have is that when a user downloads a file then immediately
trys to upload another, they are prompted to download the file that they
have already previously downloaded. If however I replace the commandLinks
for commandButtons the application behaves correctly.

I have seen an associated link that mentions similar behaviour
(http://blogs.sun.com/tor/entry/creating_downloadable_files), however I do
not want to use the command buttons in this manner, and I use an
actionListener rather than an action so I may retrieve information from the
list of dynamically created files. I am not receiving any errors, just the
strange behaviour with commandLinks.

My code is as follows:

 public void downloadFile(ActionEvent ev) {
        UIData fileList = findParentHtmlDataTable(ev.getComponent());
        AssociatedFile associatedFile = (AssociatedFile)
fileList.getRowData();
        String downloadPath = "download path retrieved here...";

        try {
            byte[] fileData = InternalUtil.readFile(downloadPath);
            HttpServletResponse response =
                    (HttpServletResponse)
getFacesContext().getExternalContext().getResponse();

            response.setHeader("Content-disposition", "attachment;
filename=\"" +
                    associatedFile.getName() +
                    "\"");


            response.setContentLength(fileData.length);
            response.setContentType(associatedFile.getContentType());
            ServletOutputStream out = response.getOutputStream();
            out.write(fileData);

           
getFacesContext().getApplication().getStateManager().saveSerializedView(getFacesContext());
            getFacesContext().responseComplete();


        } catch (FileSystemException e) {
            getFacesContext().addMessage("null", new FacesMessage("Error
downloading file: " +
                    e.getMessage()));
        } catch (IOException e) {
            getFacesContext().addMessage("null", new FacesMessage("Error
downloading file: " +
                    e.getMessage()));
        }
}

Any help would be greatly appreciated!

Thanks in anticipation, Carl     
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