That looks more like a bug in the write() method of the JSF RI. Apparently its calling a PrintWriter with null. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4060344#4060344 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=4060344