HTTP Status 500 - nulltype Exception reportmessage nulldescription The server encountered an internal error that prevented it from fulfilling this request.exceptionjava.lang.NumberFormatException: null java.lang.Integer.parseInt(Unknown Source) java.lang.Integer.parseInt(Unknown Source) com.bzjy.servlet.ProductClassServlet.doPost(ProductClassServlet.java:71) com.bzjy.servlet.ProductClassServlet.doGet(ProductClassServlet.java:49) javax.servlet.http.HttpServlet.service(HttpServlet.java:624) javax.servlet.http.HttpServlet.service(HttpServlet.java:731) org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) com.bzjy.filter.CharSetFilter.doFilter(CharSetFilter.java:27)note The full stack trace of the root cause is available in the Apache Tomcat/7.0.70 logs.Apache Tomcat/7.0.70public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { int id=Integer.parseInt(request.getParameter("id")); int flag=Integer.parseInt(request.getParameter("flag")); if(flag==0){ ProductParentBiz ppbiz=new ProductParentBizImpl(); ppbiz.delParentCate(id); }else{ ProductCategoryBiz pcbiz=new ProductCategoryBizImpl(); pcbiz.delChildCate(id); } response.sendRedirect("ProductClassServlet"); }
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