How to solve Payment Billing system?

By: steven*** On: Sun Apr 30 21:00:53 IST 2017     0 0 0	0
HTTP Status 500 - An exception occurred processing JSP page /aloginprocess.jsp at line 7 type Exception report message An exception occurred processing JSP page /aloginprocess.jsp at line 7 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 /aloginprocess.jsp at line 7 4: String username=getServletContext().getInitParameter("Username"); 5: String password=getServletContext().getInitParameter("Password"); 6: 7: if(request.getParameter("username").equalsIgnoreCase(username)&& request.getParameter("userpass").equalsIgnoreCase(password)) 8: { 9: session.setAttribute("islogin","plz sign in first"); 10: %> Stacktrace: org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:574) org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:476) org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:396) org.apache.jasper.servlet.JspServlet.service(JspServlet.java:340) javax.servlet.http.HttpServlet.service(HttpServlet.java:729) org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:393) root cause java.lang.NullPointerException org.apache.jsp.aloginprocess_jsp._jspService(aloginprocess_jsp.java:119) 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:396) org.apache.jasper.servlet.JspServlet.service(JspServlet.java:340) javax.servlet.http.HttpServlet.service(HttpServlet.java:729) org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:393) note The full stack trace of the root cause is available in the Apache Tomcat/8.0.27 logs. Apache Tomcat/8.0.27	0