type Exception report
message An exception occurred processing JSP page /dettagli-articolo.jsp at line 18
description The server encountered an internal error that prevented it from fulfilling this request.
exception
org.apache.jasper.JasperException: An exception occurred processing JSP page /dettagli-articolo.jsp at line 18 15: ArticoloDAO articoloDAO = new ArticoloDAO(); 16: Articolo articolo = articoloDAO.getArticolo(id); 17: UserDAO userDAO = new UserDAO(); 18: User user = userDAO.getUser(articolo.getAutore_scheda()); 19: 20: if (Utils.isUserAutorizzato(session, user, articolo) || articolo.getDisponibilita().equalsIgnoreCase("disponibile a stock")) { 21: Stacktrace: org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:578) org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:476) org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:401) org.apache.jasper.servlet.JspServlet.service(JspServlet.java:345) javax.servlet.http.HttpServlet.service(HttpServlet.java:729) org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
root cause
java.lang.NullPointerException org.apache.jsp.dettagli_002darticolo_jsp._jspService(dettagli_002darticolo_jsp.java:141) org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70) javax.servlet.http.HttpServlet.service(HttpServlet.java:729) org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:438) org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:401) org.apache.jasper.servlet.JspServlet.service(JspServlet.java:345) javax.servlet.http.HttpServlet.service(HttpServlet.java:729) org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
note The full stack trace of the root cause is available in the Apache Tomcat/8.0.32 (Ubuntu) logs.