Question

this is my first question in the forum, I hope you can help me with this.
My escenary:

1. A file on the basis that I want to download from a browser
2. I’m using primefaces, FileDownload and StreamedContent

The problem

The problem is that downloading a file 0Bytes

My view.xhtml:

<p:commandButton id="downloadLink" value="Descargar" ajax="false" onclick="PrimeFaces.monitorDownload(start, stop)"   
                                         rendered="#{not anexoController.ingresaDatos}" icon="ui-icon-arrowthichk-s">  
                            <p:fileDownload value="#{anexoController.file}" />  
                        </p:commandButton>

My DownloadManger

    public StreamedContent getFile() {
    file = null;
    byte[] bytes = anexoActual.getArchivo(); //anexoActual.getArchivo.length = 53508
    String nombre = anexoActual.getNombre(); 
    String formato = anexoActual.getFormato();
    InputStream stream = new ByteArrayInputStream(bytes);
    try {
        stream.read(bytes);
    } catch (IOException ex) {
        Logger.getLogger(AnexoController.class.getName()).log(Level.SEVERE, null, ex);
    }
    file = new DefaultStreamedContent(stream, formato, nombre);
    return file; //file.steam.buf.length = 53508
}

As you can see the file reaches the file with a length of 53508 bytes, but when the download is complete the only thing that I have the file name and data type

Answer 1

Look at this code:

try {
    stream.read(bytes);
} catch (IOException ex) {
    Logger.getLogger(...)
}

You’re reading from the stream – back into the byte array which contains the data to start with. Why are you doing that? It’s positioning the stream at the end.

Just remove that block and it may well be fine.