Error occured

/balanchine/display_result.jsp
500
An exception occurred processing JSP page /display_result.jsp at line 284 281: --%> 282: 283: <% 284: String doc_xml = pageContext.getAttribute("main_xml").toString(); 285: doc_xml = highlight(doc_xml, originalSearch, searchMethod); 286: //out.println(originalSearch + "
"); 287: //out.println("
"); Stacktrace: