p:filedownload from p:datatable with ViewScoped managed bean

[d1van]

p:filedownload from p:datatable with ViewScoped managed bean wont work. It calls the methods prepareFile and getFile twice. In first call of the methods I mentioned it sets the first file from the table, and in the second call of the methods it sets the right file, but it always downloads only the first one and the second one is never downloaded.

Why does it call twice? Why does it set the first file from the table? Any ideas?

Here's my code:

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<p:dataTable id="offer_attachment_datatable"
                     widgetVar="offer_attachment_datatable"
                     var="attachment"
                     value="#{offerBean.offerAttachments}">
            <p:column>
                <f:facet name="header"/>
                <p:commandLink ajax="false" actionListener="#{offerBean.prepareFile(attachment)}" title="#{attachment.name}">
                    <p:graphicImage value="/resources/themes/navigator_b2e/images/drive-download.png" />
                    <p:fileDownload value="#{offerBean.file}"/>
                </p:commandLink>
            </p:column>
</p:dataTable>

and in managed bean (simplified):

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    private StreamedContent file;
    private InputStream stream;

    public void prepareFile(OfferAttachment attachment){
        System.out.println("Attachment: "+attachment.getName());
        stream = new ByteArrayInputStream(attachment.getAttachment());
        file = new DefaultStreamedContent(stream, "text/plain", attachment.getName());
        stream = null;
    }

    public StreamedContent getFile() {
        System.out.println("File: "+file.getName());
        return file;
    }

    public void setFile(StreamedContent file) {
        this.file = file;
    }

[cagatay.civici]

Use f:param when using fileDownload inside data iteration components to identify which file to download.

[d1van]

I've passed a rowIndex as f:param, but it always passes the same rowIndex

[d1van]

also, I'm using PF 2.2.1 if that matters

[d1van]

I think this ajax=false in filedownload blocks it somehow... any ideas?

[d1van]

Ok, guys, so I made a workaround with a simple p:confirmDialog where I extracted the problematic ajax=false command link, so I select the attachment by clicking it in p:datatable and execute the download from the p:confirmdialog.

[cagatay.civici]

Not rowIndex, better sth from your domain model to identify the data to export.

[d1van]

I tried that too, always sends the first selected information... very strange.

But thank you!

[d1van]

Now it seems like the bean is destroyed. It downloads the right file, but when I try some action after that, i get

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SEVERE: com.sun.faces.mgbean.ManagedBeanCreationException: An error occurred performing resource injection on managed bean offerBean