[jboss-user] [JBoss Portal] - Re: image/png Content type not accepted

seansullivan do-not-reply at jboss.com
Wed Oct 25 01:42:06 EDT 2006

I fixed my portlet.xml file but I don't think JBoss Portlal can handle a portlet that produces image/png data.

On the OpenSymphony message board, I found a discussion about producing image output from a portlet:


anonymous wrote : 
  | Nils-Helge Garli wrote:
  | > Hm... I might have been wrong about it. Maybe you can't generate
  | > image output from a portlet. Didn't see anything about that in the
  | > portlet spec (maybe someone can enlighten me?).
  | There's nothing that prohibits it, but there's also nothing that
  | supports it, other than the call to response.setContentType();
  | What a portal has to do is define a custom window state that says
  | "display only this portlet". When the portlet is rendered with such a
  | state it can assume that it will "own" the output, and can thus create
  | images or Excel reports or whatever.
  | The usual workaround for portals that doesn't have such a window state
  | is to link to a servlet that can generate the data instead. Using a
  | servlet is worse, however, since it cannot leverage any security
  | configuration that a portlet would be able to, and would have to ensure
  | on its own that any call is legitimate. But sometimes that is ok.
  | /Rickard 

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