Download File in Oracle ADF GUI : -af:fileDownloadActionListener and getRealPath() and weblogic.xml and show-archived-real-path-enabled

 

I had simple requirement to allow the user to download file from ADF Application i.e. PDF file , Word file.

So I am creating simple application with commandbutton with filedownloadactionlistener.

Please download the application Download Here

I added testdownload.txt file inside ViewController\public_html folder

Command Button

I added following code to dwdFile method.

FileDownloadActionListener Method  

    public void dwdFile(FacesContext facesContext, OutputStream out) {
        FacesContext fx = FacesContext.getCurrentInstance();
        ServletContext servCtx =
            (ServletContext)fx.getExternalContext().getContext();
        System.out.println(servCtx.getRealPath("/"));
        File file = new File(servCtx.getRealPath("/") + "testdownload.txt");
        FileInputStream fdwd;
        byte[] bt;
        try {
            System.out.println(file.getCanonicalPath());
            System.out.println(file.getAbsolutePath());
            fdwd = new FileInputStream(file);
            int checkline;
            while ((checkline = fdwd.available()) > 0) {
                bt = new byte[checkline];
                int rst = fdwd.read(bt);
                out.write(bt, 0, bt.length);
                if (rst == -1)
                    break;
            }
            out.flush();
        } catch (IOException e) {
            this.addMessage(FacesMessage.SEVERITY_ERROR,
                            "File cannot be downloaded , Please contact administrator.");
        }
    }

When I ran the jspx locally it downloaded the file successfully.

Deploying application as EAR

 

When I deployed application as ear and click the download button it did not downloaded the file and it printed null for getRealPath().

 

After some time I figured out that I have to generate weblogic.xml

 

 

and set the following property to true.

Enable getRealPath() results for archived web apps.

 

 

 

Now when I deployed the application on EAR ,it allowed me to download the file successfully.

Reason

There is known CR with Weblogic for this Issue

CR299135 -  Weblogic getRealPath Issue