I am trying to create a portlet that just returns content of type image/png. So I have configured my portlet with: <supports> | <mime-type>image/png</mime-type> | <portlet-mode>VIEW</portlet-mode> | </supports> and in my portlet I set the type as: response.setContentType("image/png"); But when I run the portlet I get the following exception: java.lang.IllegalArgumentException: Content type not accepted According to the spec this exception is thrown when the content type does not match request.getResponseContentType(). When I add a debug statement, I see that request.getResponseContentType() returns text/html. Shouldn't this return image/png since I configured it as above? Or is this a bug or am I trying to do something that I shouldn't? View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3972015#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...