Type Exception Report
Message An exception occurred processing [itemDetailView.jsp] at line [17]
Description The server encountered an unexpected condition that prevented it from fulfilling the request.
Exception
org.apache.jasper.JasperException: An exception occurred processing [itemDetailView.jsp] at line [17] 14: User user = (User) request.getAttribute("user"); 15: String msg = (String) request.getAttribute("msg"); 16: int totalItems = 0; 17: for (CartItem cartItem : cartList) { 18: totalItems += cartItem.getAmount(); 19: } 20: String username = ""; Stacktrace: org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:610) org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:499) org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:379) org.apache.jasper.servlet.JspServlet.service(JspServlet.java:327) javax.servlet.http.HttpServlet.service(HttpServlet.java:623) org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:51) aiwa.controller.ItemDetailController.doGet(ItemDetailController.java:49) javax.servlet.http.HttpServlet.service(HttpServlet.java:529) javax.servlet.http.HttpServlet.service(HttpServlet.java:623) org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:51)
Root Cause
java.lang.NullPointerException: Cannot invoke "java.util.List.iterator()" because "cartList" is null org.apache.jsp.itemDetailView_jsp._jspService(itemDetailView_jsp.java:142) org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70) javax.servlet.http.HttpServlet.service(HttpServlet.java:623) org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:466) org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:379) org.apache.jasper.servlet.JspServlet.service(JspServlet.java:327) javax.servlet.http.HttpServlet.service(HttpServlet.java:623) org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:51) aiwa.controller.ItemDetailController.doGet(ItemDetailController.java:49) javax.servlet.http.HttpServlet.service(HttpServlet.java:529) javax.servlet.http.HttpServlet.service(HttpServlet.java:623) org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:51)
Note The full stack trace of the root cause is available in the server logs.