Hi all i hai the same problem discussed here but i'm going to fighting with an application/pdf mime tipe. the proble is analogous, what change is the type of output returned. I have developed a CMS portlet that contain a link to my PDF file that is stored in the CMS too, but now i need to open the pdf content only within a window, reading the PDF file from a CMS I have already set the returned mime type in my portlet implementation rResponse.setContentType("application/pdf"); and in my portlet.xml <mime-type>application/pdf</mime-type> but as result i have only seen a "wonderful", unlimited stack trace in my server's log that say: java.lang.IllegalArgumentException: Content type not accepted ... <infinite stack...> ... Caused by: javax.activation.MimeTypeParseException: Type [application/pdf] not supported any advice will be appreciated!!! I use jboss portal 2.6.5 View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4166622#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...