HTTP Status 500 - Servlet execution threw an exception

type Exception report

message Servlet execution threw an exception

description The server encountered an internal error that prevented it from fulfilling this request.

exception

javax.servlet.ServletException: Servlet execution threw an exception
    org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
root cause

java.lang.NoClassDefFoundError: com/sun/image/codec/jpeg/JPEGCodec
    com.java4less.rchart.gc.awt.ImageEncoder.saveToJPEG(ImageEncoder.java:84)
    com.java4less.rchart.gc.awt.ImageEncoder.encode(ImageEncoder.java:41)
    com.java4less.rchart.gc.awt.ChartAwtImage.saveToStream(ChartAwtImage.java:138)
    com.java4less.rchart.Chart.saveToFile(Chart.java:1494)
    com.java4less.rchart.web.MindChartServlet.doGet(MindChartServlet.java:238)
    com.java4less.rchart.web.MindChartServlet.doPost(MindChartServlet.java:257)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:648)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
    org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
root cause

java.lang.ClassNotFoundException: com.sun.image.codec.jpeg.JPEGCodec
    org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1333)
    org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1167)
    com.java4less.rchart.gc.awt.ImageEncoder.saveToJPEG(ImageEncoder.java:84)
    com.java4less.rchart.gc.awt.ImageEncoder.encode(ImageEncoder.java:41)
    com.java4less.rchart.gc.awt.ChartAwtImage.saveToStream(ChartAwtImage.java:138)
    com.java4less.rchart.Chart.saveToFile(Chart.java:1494)
    com.java4less.rchart.web.MindChartServlet.doGet(MindChartServlet.java:238)
    com.java4less.rchart.web.MindChartServlet.doPost(MindChartServlet.java:257)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:648)
    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/8.0.30 logs.

private Chart getChart(HttpServletRequest request) {


        ChartLoader loader = new ChartLoader();
        loader.paintDirect = true;
        String dataFile = null;
        String fileEncoding = "";
        String user = "";
        String psw = "";
        String delim = null;
        if (request != null) {
            boolean isUri = false;

            for (Enumeration ps = request.getParameterNames(); ps
                    .hasMoreElements();) {
                String name = (String) ps.nextElement();
                if (!isUri) {
                    loader.setParameter(name, request.getParameter(name));
                    if (name.compareTo("DATAFILE") == 0) {
                        dataFile = request.getParameter(name);
                    }
                    if (name.compareTo("PSW") == 0) {
                        psw = request.getParameter(name);
                    }
                    if (name.compareTo("USER") == 0) {
                        user = request.getParameter(name);
                    }
                    if (name.compareTo("FILEENCODING") == 0) {
                        fileEncoding = request.getParameter(name);
                    }
                    if (name.compareTo("ISURI") == 0) {
                        dataFile = request.getParameter(name);
                        isUri = true;
                        delim = "?";
                    }

                } else {
                    dataFile = dataFile + delim + name + "="
                            + request.getParameter(name);
                    delim = "&";
                }
            }


        }
        String encodedUserPsw = "";
        if (user.length() > 0) {
            String userPassword = user + ":" + psw;
            encodedUserPsw = (new BASE64Encoder()).encode(userPassword
                    .getBytes());

        }
        File f = new File("a.txt");

        if (dataFile != null) {
            loader.fileEncoding = fileEncoding;
            loader.loadFromFile(dataFile, false, encodedUserPsw);
        } else {

            String[] chartparamname = new String[new Integer(
                    request.getParameter("LENGTH")).intValue()];
            String[] chartparamvalue = new String[new Integer(
                    request.getParameter("LENGTH")).intValue()];
            int i = 0;

            for (Enumeration ps = request.getParameterNames(); ps
                    .hasMoreElements();) {
                String name = (String) ps.nextElement();
                if ((name.equals("WIDTH")) || (name.equals("HEIGHT"))
                        || (name.equals("LENGTH"))
                        || (name.equals("LEGEND_TITLE"))) {
                } else {
                    chartparamname[i] = name;
                    chartparamvalue[i] = request.getParameter(name);
                    i++;

                }
            }
            loader.setvalues(chartparamname, chartparamvalue,
                    request.getParameter("LEGEND_TITLE"));
        }
        Chart chart = loader.build(false, false);
        return chart;
    }

    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

        String encode = "jpeg";

        response.setContentType("image/" + encode);
        javax.servlet.ServletOutputStream outb = response.getOutputStream();
        response.setDateHeader("Expires", 0L);
        try {
            int w = 300;
            int h = 300;

            Chart c = getChart(request);
            c.setSize(w, h);
            c.doubleBuffering = false;
            c.saveToFile(outb, encode);
            outb.close();
        } catch (Exception e) {
            logger.error("doGet(HttpServletRequest, HttpServletResponse)", e);
        }
    }

<dependency>
            <groupId>java4less</groupId>
            <artifactId>java4less</artifactId>
            <version>1.0.0</version>
            <optional>false</optional>
        </dependency>