I'm trying to show inline PDF which is opened in new browser window. I have following scenario:

  1. In some ActionListen which is called by ajax I generate PDF content, put data in session, and send Javascript to be executed (window.open to open new page to show PDF)

  2. On opened page I just have p:media tag inside h:body with value pointing to StreamedContent:

Now, on that page my PDF is not generated. In log I can see these two lines:

org.primefaces.application.PrimeResourceHandler handleResourceRequest
SEVERE: Error in streaming dynamic resource. Expression cannot be null

I started to debug and find out a few things.

First, I added breakpoint to @PostConstruct method of my RequestScoped bean. What is interesting is that breakpoint is reached twice, and to my big surprise after that PDF is shown perfectly?!

After some debugging through PrimeResourceHandler I figure out that in some cases ValueExpression is not calculated, in fact it throws NullPointerException, and again while debugging I saw that two requests are sent, and second request fails because dynamicContentId is removed in first request, and second call to handleResourceRequest doesn't have sense.

Through Firebug I can see two requests, first which is good with PDF data, and second which is also with content-type application/pdf but empty, with size 0.

xhtml page:

<html>
  <h:head></h:head>
  <h:body>
    <p:media value="#{reportBean.streamedContent}" player="pdf" width="500" height="500"/>
  </h:body>
</html>

backing bean:

@RequestScoped
public class StampaListeBackingBean implements Serializable {

    private static final long serialVersionUID = 1
pdf jsf-2 primefaces stream media
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