This also occurs in Portal 9.0.2 in the file calendar.jsp, calendarDialog.jsp, and fred.jsp, all of which are under the $ORACLE_HOME/j2ee directory in various locations. The offending code is String enc = request.getParameter("enc"); if ((enc == null) || "".equals(enc)) response.setContentType("text/html"); else response.setContentType("text/html;charset=" + enc); which can be commented out as follows: // String enc = request.getParameter("enc"); // if ((enc == null) || "".equals(enc)) response.setContentType("text/html"); // else // response.setContentType("text/html;charset=" + enc);