JApplet not found in IE

Here's the problem, I have a home http server my computer and I can load the applets by a test loop through the internet back to my computer, but when I go to another computer on the network and try the same thing, except no loop back, I get an error in IE stating "class IOTest not found" you can check it out at http://www.hcravers.tk
thanks.

Never mind, I found the problem. I've tested the applets from an external computer on the internet and the applets were view fine and worked like a charm. But the problem still reside back on the network where one computer connects to my computer from the network but through the internet IP address, and since both computers have the same ip address I believe it is trying to find the applet.class files on that computer instead of my computer.

Similar Messages

  • JApplet not found in Internet Explorer 5.0

    I learning how works JApplet's, but I Have a problem.
    Somebody can say to me because my code does not work?
    My code:
    import javax.swing.JApplet;
    import java.awt.*;
    import java.awt.event.*;
    import javax.swing.*;
    import javax.swing.table.*;
    import javax.swing.text.*;
    import javax.swing.event.*;
    import javax.swing.border.*;
    public class JAppletExample extends JApplet
    JButton jb;
    BorderLayout layout;
    public void init()
    layout=new BorderLayout(20,10);
    this.setLayout(layout);
    jb=new JButton("prueba ");
    this.add("Center",jb);
    public void start() { }
    This is the error message from the Java Console:
    java.lang.ClassNotFoundException: javax.swing.JApplet
         at com/ms/vm/loader/URLClassLoader.loadClass
         at java/lang/ClassLoader.loadClassInternal
         at java/lang/ClassLoader.resolveClass
         at com/ms/vm/loader/URLClassLoader.loadClass
         at com/ms/vm/loader/URLClassLoader.loadClass
         at com/ms/applet/AppletPanel.securedClassLoad
         at com/ms/applet/AppletPanel.processSentEvent
         at com/ms/applet/AppletPanel.processSentEvent
         at com/ms/applet/AppletPanel.run
         at java/lang/Thread.run
    Thanks in advance.

    You can force Internet Explorer to use the Sun Java Plugin by changing this key into windows registry:
    Registry>HKEY_LOCAL_MACHINE>SOFTWARE>JavaSoft>Java Plug-in>1.4.1_02>UseJava2Iexplorer
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  • I'm crazy!Applet and JNA Error:Library 'jnidispatch' was not found!

    Hi all,
    sorry to bother you, I really have no idea how to do JNA and Applet. I'm hardly mazy, man.
    Every time it will throw an error to me :
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         at com.sun.jna.NativeLibrary.<clinit>(NativeLibrary.java:576)
         at com.sun.jna.Library$Handler.<init>(Library.java:140)
         at com.sun.jna.Native.loadLibrary(Native.java:372)
         at com.sun.jna.Native.loadLibrary(Native.java:357)
         at JNAApplet.init(JNAApplet.java:15)
         at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Unknown Source)
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    here is the structure of my program:
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    import javax.swing.JButton;
    import javax.swing.JPanel;
    import com.sun.jna.Native;
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         public static Kernel32 kernel32 = null;
         @Override
         public void init() {
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              kernel32 = (Kernel32)Native.loadLibrary("Kernel32", Kernel32.class);
              if (kernel32 == null) {
                   System.out.println("load kernel32 fail!");
              } else {
                   System.out.println("load kernel32 success!");
         private void createGUI() {
              JPanel panelCenter = new JPanel();
              JButton butTest = new JButton("Test");
              panelCenter.add(butTest);
              setContentPane(panelCenter);
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    My Applet html:
    <html>
         <head>
              <title>JNA Applet</title>
         </head>
         <body>
         <script src="deployJava.js"></script>
        <script>
            var attributes = { code:'JNAApplet',  width:300, height:300} ;
            var parameters = {jnlp_href: 'JNAApplet.jnlp'} ;
            deployJava.runApplet(attributes, parameters, '1.5');
        </script>
         </body>
    </html>File 'JNAApplet.jnlp':
    <?xml version="1.0" encoding="UTF-8"?>
    <jnlp spec="1.0+" codebase="" href="">
        <information>
            <title>JNA Applet</title>
            <vendor>Steven</vendor>
        </information>
        <resources>
            <j2se version="1.5+"
                  href="http://java.sun.com/products/autodl/j2se" />
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             name="JNA Applet"
             main-class="JNAApplet"
             width="300"
             height="300">
         </applet-desc>
         <update check="background"/>
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    Can any one help me? Thank you very much!!!!

    Hi AndrewThompson64:
    Did you mean the JNA project? Or are you refering to JNI, or ..something else?Yes, I mean is that I wanna jna.jar to replace JNI to code with Applet. I want Applet can run native library(.dll files).
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    Was there any 'caused by' part that you trimmed? I expected to see something to do with 'Security' or 'AccessControl'.Sorry, I can't saw any 'cause by' subsentence there. This message is just gain from Applet Console.(Is there any method to gain more message?)
    About 'Security' and 'AccessControl' I just modify my java.policy file to allpermission. Subsequently, I signed all jar files.
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    --example.jar :  for this little program.(code include applet and application entry)
    --jna.jar
    --win32-x86.jar : include kernel32.dll and jnidispatch.dll for win32 and x86.
    and 2 JNLP files:
    --JNAApplet.jnlp the entry is JNAApplet.class (this jnlp does not work)
    --JNAApp.jnlp     the entry is JNAApp.class  (this jnlp works)
    And for now new error message show like this:
    Exception in thread "thread applet-JNAApplet-1" java.lang.UnsatisfiedLinkError: Library 'Kernel32' was not found by class loader sun.plugin2.applet.JNLP2ClassLoader@4aeb52
         at com.sun.jna.Native.getWebStartLibraryPath(Native.java:858)
         at com.sun.jna.NativeLibrary.loadLibrary(NativeLibrary.java:97)
         at com.sun.jna.NativeLibrary.getInstance(NativeLibrary.java:228)
         at com.sun.jna.Library$Handler.<init>(Library.java:140)
         at com.sun.jna.Native.loadLibrary(Native.java:372)
         at com.sun.jna.Native.loadLibrary(Native.java:357)
         at JNAApplet.init(JNAApplet.java:12)
         at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Unknown Source)
         at java.lang.Thread.run(Unknown Source)
    Did you mean invoke?
    Revoke: To annul by withdrawing.
    Invoke: To call on.Yes, you got it. Thank you.
    The JNLP file is invalid. ..I was about to put my 'standard' text here, but I'm sick of saying it. Search the forum for my posts - 50% of them, at least, mention validation and how to go about it.
    Also, the applet-desc requires a documentbase.Thank you, I really think I have some invalid section. But I can't find it, and you said 'Search the forum for my posts - 50% of them...' , I can read the JNLP structure on site of sun and I can to read you post too(I'm doing like this).*I only want to know about how to load "native lib like *.dll" properly*.
    What 'officer site'?I mean jna project site. Sorry for ambiguity.
    Please fix that sticky '!' key. One '!' indicates astonishment, while two or more typically indicates a bozo. Thanks for your advice. Because I tried to find solution do my best lasting two days. I got nothing. I'm sadness.
    here post my new files:
    import javax.swing.JFrame;
    import com.sun.jna.Native;
    public class JNAApp {
         public static Kernel32 kernel32 = null;
         public static void main(String[] args) {
              // TODO Auto-generated method stub
              kernel32 = (Kernel32)Native.loadLibrary("Kernel32", Kernel32.class);
              JFrame frame = new JFrame();
              frame.setSize(500, 500);
              frame.setVisible(true);
    import javax.swing.JApplet;
    import javax.swing.JButton;
    import javax.swing.JPanel;
    import com.sun.jna.Native;
    public class JNAApplet extends JApplet {
         public static Kernel32 kernel32 = null;
         public void init() {
              createGUI();
                   kernel32 = (Kernel32)Native.loadLibrary("Kernel32", Kernel32.class);
         private void createGUI() {
              JPanel panelCenter = new JPanel();
              JButton butTest = new JButton("Test");
              panelCenter.add(butTest);
              setContentPane(panelCenter);
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    <jnlp spec="1.0+" codebase="" href="">
        <information>
            <title>JNA Applet</title>
            <vendor>Steven</vendor>
        </information>
        <resources>
            <j2se version="1.5+"
                  href="http://java.sun.com/products/autodl/j2se" />
             <jar href="JNAApplet.jar" main="true"/>
             <jar href="jna.jar"/>
        </resources>
           <resources os="Windows" arch="x86">
             <nativelib href="win32-x86.jar"/>
             <nativelib href="kernel32.jar"/>
           </resources>
        <applet-desc
             documentBase=""
                name = "success"
             main-class="JNAApplet" width = "200" height = "200">
         </applet-desc>
         <update check="background"/>
           <security>
             <all-permissions/>
           </security>
    </jnlp>     
    <?xml version="1.0" encoding="UTF-8"?>
    <jnlp spec="1.0+" codebase="" href="">
        <information>
            <title>JNA Applet</title>
            <vendor>Steven</vendor>
        </information>
        <resources>
            <j2se version="1.5+"
                  href="http://java.sun.com/products/autodl/j2se" />
             <jar href="JNAApplet.jar" main="true"/>
             <jar href="jna.jar"/>
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           <resources os="Windows" arch="x86">
             <nativelib href="win32-x86.jar"/>
             <nativelib href="kernel32.jar"/>
           </resources>
        <application-desc
             main-class="JNAApp">
         </application-desc>
         <update check="background"/>
           <security>
             <all-permissions/>
           </security>
    </jnlp>     Thanks & Best Regards,
    Su Heng

  • Class not found error for applet.

    This is probally a really simple mistake but I've tried everything and can't find it.
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    You have a similar problem like I had.
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    For all who are experiencing the same problem!
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    Have fun!
    If you have any questions I would be pleased to help you.
    If this tip helped you already I would be pleased if you would send me a quick email with your experience.
    My email: [email protected]

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    Hi.
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    session.setAttribute ("AUDataID", auDataID);
    sendAU (studentID.intValue(), courseID.intValue(), lessonID, auID, auDataID.intValue(), normalMode, response.getOutputStream(), dbHelper);
    //to do: detailed messages should be sent to the client depending on which
    // exception was thrown. Don't have one try/catch....have one for each situation
    catch (Exception e) {
    e.printStackTrace();
                   getServletContext().log("Error: " + e.getMessage());
    public void destroy()
              try {
                   if (_jdbcConnection != null) {
                        _jdbcConnection.close();
              catch (Exception ignored) {}
    private int initializeAUData (int studentID, int courseID, String lessonID, String auID, JDBCHelper dbHelper)
    String sqlQuery = null;
    ResultSet results = null;
    try {
    //get student's name
    sqlQuery = "SELECT Full_Name" +
    " FROM " + GlobalData.StudentTable +
    " WHERE Student_ID = " + studentID;
    results = dbHelper.doQuery (sqlQuery);
    if (! results.next()) {
    //error
    return -1;
    String studentName = results.getString (1);
    results.close();
    //the lock prevents CMIServlet from reading AU_ID before it's committed
    //sqlQuery = "LOCK TABLES " + GlobalData.AUDataTable + " WRITE;";
    //System.out.println (sqlQuery);
    //dbHelper.executeUpdate (sqlQuery);
    sqlQuery = "Insert Into " + GlobalData.AUDataTable +
    "(Course_ID, Lesson_ID, AU_ID, student_id, student_name, lesson_location, credit," +
    " lesson_status, entry, exit, score_raw, score_max, score_min, total_time," +
    " session_time, lesson_mode, suspend_data, launch_data, Evaluation_ID, Objective_ID)" +
    " Values (" + courseID + ", '" + lessonID + "', '" + auID + "', " + studentID + ", '" + studentName + "'," +
    " 'NA', 'credit'," + " 'not attempted', 'ab-initio', " + "'NA', " + 0 + ", " + 0 + ", " + 0 +
    ", '00:00:00.0', '00:00:00.0', " + " 'normal'" + ", 'NA', " + "'NA', " + 0 + ", " + 0 + ");";
    dbHelper.executeUpdate (sqlQuery);
    return getAUDataID (studentID, courseID, lessonID,auID, dbHelper);
    //sqlQuery = "UNLOCK TABLES;";
    //System.out.println (sqlQuery);
    //dbHelper.executeUpdate (sqlQuery);
    catch (Exception e) {
    e.printStackTrace();
                   getServletContext().log("Error: " + e.getMessage());
    return -1;
    private int getAUDataID (int studentID, int courseID, String lessonID, String auID, JDBCHelper dbHelper)
    throws SQLException
    String sqlQuery = "SELECT AUData_ID, lesson_status, lesson_mode, exit" +
                                  " FROM " + GlobalData.AUDataTable +
                                  " WHERE student_id = " + studentID +
                                  " AND Course_ID = " + courseID +
    " AND Lesson_ID = " + "'" + lessonID + "'" +
    " AND AU_ID = '" + auID + "';";
    ResultSet results = dbHelper.doQuery (sqlQuery);
    if (results.next()) {
    return results.getInt ("AUData_ID");
    return -1;
    private void sendAU (int studentID, int courseID, String lessonID, String auID, int auDataID, boolean normalMode, ServletOutputStream htmlOut, JDBCHelper dbHelper)
    throws IOException, ClassNotFoundException
    Hashtable hash = null;
    synchronized (_courseHash)
    hash = (Hashtable) _courseHash.get (String.valueOf (courseID));       
    if (hash == null) {
    loadCourseData();
    hash = (Hashtable) _courseHash.get (String.valueOf (courseID));
    if (hash == null) {
    throw new IOException ("Corrupt course data (course not found)");
    AU au = (AU) hash.get (auID);
    try {
    if (! normalMode) {
    dbHelper.setReviewMode (auDataID);
    String courseFileName = getFileName (String.valueOf (courseID), dbHelper);
    File file = new File (courseFileName);
    //create absolute path to file so we can resolve relative URLs
    String newFileName = file.getParent() + "\\" + au.getLaunchParams();
                   BufferedReader buf = new BufferedReader (new FileReader (newFileName));
    PrintWriter htmlWriter = new PrintWriter (htmlOut);
                   String temp;
    htmlWriter.write (getAUHtml (au.getLaunchParams()));
    htmlWriter.flush();
    htmlWriter.close();
    catch (Exception e) {
    e.printStackTrace();
                   getServletContext().log("Error: " + e.getMessage());
    private String getAUHtml (String path){
    path = path.replace ('\\','/');
    String response;
    response = "<html>\n" +
                        "<head>\n" +
    "</head>\n" +
    "<body>\n" +
    "<script language=\"JavaScript\">\n" +
    "document.location = \"/cmi/courses/" + path + "\"\n" +
    //"win = window.open ('','displayWindow','menubar=yes,scrollbars=yes,status=yes,width=300,height=300');\n" +
    //"window.onload = \"win.close();\"" +
    "</script>\n" +
    "</body>\n" +
    "</html>\n";
    return response;
    private void sendAvailableAUs (Hashtable hash, int studentID, int courseID, String lessonID, ServletOutputStream out, HttpServletResponse response, JDBCHelper dbHelper)
    StringBuffer buf = new StringBuffer (200);
    Block block = (Block) hash.get (lessonID);
    AU au = null;
    try {
    Vector completedAUs = dbHelper.getCompletedAUs (studentID, courseID, lessonID);
    buf.append ("<html>\n" +
                        "<head>\n" +
    "<title>" + block.getTitle() + " units</title>\n" +
    "<script language=\"JavaScript\">\n" +
    "function go() {\n" +
    " var form = document.goForm;\n" +
    " var index = form.gotoSelect.selectedIndex;\n" +
    " if (index == 0) {\n" +
    " document.location = \"/servlet/CourseServlet?courseID=" + courseID + "\";\n" +
    " }\n" +
    " else if (index == 1) {\n" +
    " top.restart();\n" +
    " }\n" +
    "}\n" +
    "</script>\n" +
    "</head>\n" +
    "<body background=\"/cmi/images/marble.jpg\">\n" +
    "<center><h1><b><u>" + block.getTitle() + "</u></b></h1></center>\n" +
    "<p></p>\n<p></p>\n" +
    "<b>" + block.getTitle() + " contains the following units: </b>\n" +
    "<dl>\n");
    Enumeration enum = block.getChildren();
    while (enum.hasMoreElements()) {
    String temp = (String) enum.nextElement();
    CSFElement element = (CSFElement) hash.get (temp);
    if (element.getType().equals ("au")) {
    au = (AU) element;
    if (completedAUs.contains (au.getID())) {
    buf.append ("<dt><p><img src=\"/cmi/images/node2.gif\"><a href=\"/servlet/LessonServlet?lessonID=" + block.getID() + "&auID=" + au.getID() + "&mode=review\">" + au.getTitle() + " (<i>review</i>) </a></p></dt>\n");
    else {
    buf.append ("<dt><p><img src=\"/cmi/images/node.gif\"><a href=\"" + response.encodeURL ("/servlet/LessonServlet?lessonID=" + block.getID() + "&auID=" + au.getID() + "&mode=normal") + "\">" + au.getTitle() + "</a></p></dt>\n");
    else if (element.getType().equals ("block")) {
    buf.append ("<dt><p><img src=\"/cmi/images/folder.gif\"><a href=\"" + response.encodeURL ("/servlet/LessonServlet?lessonID=" + element.getID() + "&mode=normal") + "\">" + element.getTitle() + "</a></p></dt>\n");
    buf.append ("</dl>\n" +
    "<br><br>\n" +
    "<form name=\"goForm\">\n" +
    "<select name=\"gotoSelect\">\n" +
    " <option value=\"lesson\">Lesson Menu</option>\n" +
    " <option value=\"exit\">Exit LMS</option>\n" +
    "</select>\n" +
    "<input type=\"button\" value=\"Go\" onClick=\"go()\">\n" +
    "</form>\n" +
    "</body>\n" +
    "</html>");
    PrintWriter writer = new PrintWriter (out);
    writer.write (buf.toString());
    writer.flush();
    writer.close();
    catch (Exception e) {
    e.printStackTrace();
                   getServletContext().log("Error: " + e.getMessage());
    private String getFileName (String courseID, JDBCHelper dbHelper)
    throws ClassNotFoundException, SQLException
              ResultSet results = null;
              String fileName = null;
    String sqlQuery = "SELECT CourseFile" +
                                  " FROM Course" +
                                  " WHERE Course_ID = " + Integer.parseInt (courseID) + ";";
    results = dbHelper.doQuery (sqlQuery);
              if (results.next()) {
                   fileName = results.getString (1);
              else {
    //need to do more than this :)
                   System.out.println("crap");
    results.close();
    return fileName;
    private void loadCourseData()
    throws IOException, ClassNotFoundException
    //load serialized course data
    File file = new File (GlobalData.DataFileName);
    if (! file.exists()) {
    //error
    throw new FileNotFoundException (GlobalData.DataFileName + " not found.");
    FileInputStream fis = new FileInputStream (GlobalData.DataFileName);
    ObjectInputStream ois = new ObjectInputStream (fis);
    _courseHash = (Hashtable) ois.readObject();
    ois.close();
    private void sendProfileError (ServletOutputStream out)
    String html = "<html>\n" +
    "<body>\n" +
    "<p>An error has occurred with your profile. Please " +
    "<a href=\"\" onClick=\"top.restart(); return true\">login again</a>" +
    "</body>\n" +
    "</html>\n";
    PrintWriter writer = new PrintWriter (out);
    writer.write (html);
    writer.flush();
    writer.close();
    private Connection _jdbcConnection;
    private Hashtable _courseHash;

    I know that is where my error is, but why and where is
    the script calling it up way?You wrote it right? check out the sendAU() method, there is line
    String newFileName = file.getParent() + "\\" + au.getLaunchParams();

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