Servlet applet : ClassNotFoundException

i m using jrun for testing servlet
i have created a servlet and it prints the following
out.println("<html>");
out.println("<body>");
out.println("<applet code=\"MyApplet\" width=\"200\" height=\"200\"></applet>");
out.println("</body>");
out.println("</html>");
but when this page load in browser it shows an error
ClassNotFoundException is throwns
i have place MyApplet.class in root directory of jrun as well as root\web-inf\classes
but it didn't work

Specify the codebase in the applet tag.

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Servlet Applet object communication problem???!!!

Hy folks,
I need to validate the ability of complex Servlet Applet communication an run into my first pb right at the beginning of my tests. I need to have around 200 Applet clients connect to my servlet and communicate by ObjectInput and ObjectOutput streams. So I wrote a simple Servlet accepting HTTP POST connections that return a Java object. When the java Applet get instantiated, the Object Stream communication workes fine. But when the Applet tries to communicate with the servlet after that, I can not create another communication session with that Servlet, instead I get a 405 Method not allowed exception.
Summarized:
- Applet init() instantiate URLConnection with Servlet and request Java object (opening ObjectInput and Output Stream, after receaving object, cloasing streams).
- When I press a "get More" button on my Applet, I am not able to instantiate a new URLConnection with my servler because of that 405 exception, WHY???
Here my Servlet code:
public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException{
         ObjectInputStream inputFromApplet = null;
         ArrayList transmitContent = null;
         PrintWriter out = null;
         BufferedReader inTest = null;
         try{
               inputFromApplet = new ObjectInputStream(request.getInputStream());
                 transmitContent = (ArrayList) inputFromApplet.readObject();
                 inputFromApplet.close();
                 ArrayList toReturn = new ArrayList();
                 toReturn.add("One");
                 toReturn.add("Two");
                 toReturn.add("Three");
                 sendAnsweredList(response, toReturn);
         catch(Exception e){}
     public void sendAnsweredList(HttpServletResponse response, ArrayList returnObject){
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          try{
              outputToApplet = new ObjectOutputStream(response.getOutputStream());
              outputToApplet.writeObject(returnObject);
              outputToApplet.flush();
              outputToApplet.close();
          catch (IOException e){
                 e.printStackTrace();
}Here my Applet code:
public void init() {
         moreStuff.addActionListener(new ActionListener(){
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         try{
              studentDBservlet = new URL("http://localhost/DBHandlerServlet");
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               servletConnection.setUseCaches (false);
               servletConnection.setDefaultUseCaches(false);
               servletConnection.setDoOutput(true);
               servletConnection.setDoInput(true);
               ObjectOutputStream outputToApplet;
             outputToApplet = new ObjectOutputStream(servletConnection.getOutputStream());
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             outputToApplet.flush();
             outputToApplet.close();
               ObjectInputStream inputFromServlet = new ObjectInputStream(servletConnection.getInputStream());
               ArrayList studentVector = (ArrayList) inputFromServlet.readObject();
               area.setText("Success!\n");
               for (int i = 0; i<studentVector.size(); i++) {
                    area.append(studentVector.get(i).toString()+"\n");
              inputFromServlet.close();
              outputToApplet.close();
          catch(Exception e){
               area = new JTextArea();
               area.setText("An error occured!!!\n");
               area.append(e.getMessage());
        getContentPane().add(new JScrollPane(area), BorderLayout.CENTER);
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         try{
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               for (int i = 0; i<studentVector.size(); i++) {
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               area.setText("An error occured2!!!\n");
               area.append(e.getMessage());
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Sorry folks, just found my error. Forgot about the ObjectInputStream waiting on the Servlet side, so of course had a dead look...
Sorry!

Servlet/Applet communication, data limit?

I have an applet that uses a servlet as a proxy to load/retrieve images from an Oracle database. I have a problem when trying to retrieve images larger than 9-10kb from the database. When using JDBC from a Java Application I don't have any probelms but through the Applet-Servlet configuration I do.
I use the following code in the Applet:
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imageServletConn.setDefaultUseCaches (false);
imageServletConn.setRequestMethod("GET");
byte buf[] = new byte[imageServletConn.getContentLength()];
BufferedInputStream instr = new BufferedInputStream(imageServletConn.getInputStream());
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Image image = Toolkit.getDefaultToolkit().createImage(buf);
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And the following for the Servlet:
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thanks in advance!

thanks for your replay,
I tried your suggestion but whatever I do it seems that tha applet only brings the first 5-10k of the image from the servlet. This is the value I get from instr.read() or any other type of read method. The value of bytes is not always the same.
Now I also have something new. For images greater than 100k or so I get this error:
java.io.IOException: Broken pipe
     at java.net.SocketOutputStream.socketWrite(Native Method)
     at java.net.SocketOutputStream.socketWrite(Compiled Code)
     at java.net.SocketOutputStream.write(Compiled Code)
     at java.io.BufferedOutputStream.write(Compiled Code)
     at org.apache.jserv.JServConnection$JServOutputStream.write(Compiled Code)
     at java.io.BufferedOutputStream.write(Compiled Code)
     at java.io.FilterOutputStream.write(Compiled Code)
     at interorient.DBProxyServlet.doGet(Compiled Code)
     at javax.servlet.http.HttpServlet.service(Compiled Code)
     at javax.servlet.http.HttpServlet.service(Compiled Code)
     at org.apache.jserv.JServConnection.processRequest(Compiled Code)
     at org.apache.jserv.JServConnection.run(Compiled Code)
     at java.lang.Thread.run(Compiled Code)
I am using the Oracle Internet application server (ias 9i) which actualy uses the apache web listener.
It seems that this servlet-applet communication is really unstable. If you have anything that may help me it will be greatly appriciated. You can even e-mail me at [email protected]
thanks!

Applet - Servlet - Database - Servlet- Applet

Hi All,
I am using Oracle8i and IE 5.0. I am trying to retrieve the data from a db table and display it.
Sequence is as following:
1. Query passed to the applet.
2. Servlet excutes this query using JDBC and returns the resultset to applet.
3. Applet displaysthe results.
Is there anybody who has a code sample to do this, my id is [email protected] ? I am totally new to java and servlets. I would really appreciate any help.
Thanks a lot.
Manuriti
[email protected]

I've never dealt with the code to handle the applet portion of what you're trying to do, but I can help you with the servlet stuff.
Your servlet should contain code to accomplish the following steps:
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2. Open a JDBC connection to the Oracle database.
3. Create a JDBC Statement object which contains the appropriate Oracle SQL code.
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6. Pool or close the Statement and Connection objects.
All of these steps are simple. Here's what they might look like in practice:
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Class.forName("oracle.jdbc.driver.OracleDriver");
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String password = "tiger";
Connection con = DriverManager.getConnection(cs, userName, password);
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Hi all,
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null

Hello!
I've got the same problem and I think it has something to do with the jserv.conf file.
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Servlet Error: ClassNotFoundException: oracle.jsp.JSPServlet

Hi,
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What can I do ?
All input are welcome ?

Hello!
I've got the same problem and I think it has something to do with the jserv.conf file.
According to the installation guide, the following line should be added:
ApJServAction .jsp /servlets/oracle.jsp.JspServlet
In the same file I have the following line:
ApJServMount /servlets /root
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Ajp12: Servlet Error: ClassNotFoundException:

I get this error in the mod_jserv.log
"(ERROR) ajp12: Servlet Error: ClassNotFoundException: BONDS.MENU_BONDS.show"
This error is caused by http://www.myserver.com/servlet/BONDS.MENU_BONDS.show
which returns "The page cannot be found".
Then when I try http://www.myserver.com/pls/portal30/BONDS.MENU_BONDS.show?
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I really need to have the servlet working because I lost some functionality.
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I suppose you have to check your NT CLASSPATH variable. It should contain all the classpaths for JDK, JAR & ZIP files correctly.
If it doesn't mail me.
APK

(ERROR) ajp12: Servlet Error: ClassNotFoundExcept

When i try to reach an URL http://10.20.108.3/servlets/ThreeParamsForm.htm, i receive the following error : [05/11/2002 15:27:53:211] (ERROR) ajp12: Servlet Error: ClassNotFoundException: ThreeParamsForm.htm.
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I am using Java Sevlets to invoke my Java Applets.
My servlet and applets is in the follwoinf directory path:
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<APPLET CODEBASE=classes/ CODE="ChatApplet.class" WIDTH=500 HEIGHT=230>
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java.lang.ClassNotFoundException: ChatApplet.class
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at sun.applet.AppletClassLoader.getBytes(AppletClassLoader.java:252).....
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hostConnection = (HttpURLConnection)hostServlet.openConnection();
hostConnection.setRequestMethod( "POST" );
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hostConnection.setDoInput( true );
hostConnection.setDoOutput( true );
hostConnection.setUseCaches( false );
hostConnection.setDefaultUseCaches( false );
hostConnection.setRequestProperty( "Content-Type", "application/x-java-serialized-object" );
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response.setContentType( "application/x-java-serialized-object" );
oos.writeObject( object );
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hmm....
i tried setting the content type to application/octet-stream but still nothing.

Signed Applet ClassNotFoundException

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Enter Passphrase for keystore:
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925 Fri Jul 04 21:44:14 MDT 2008 META-INF/MYALIAS.RSA
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basic: Exception: java.lang.ClassNotFoundException: GUI.class
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at sun.applet.AppletClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.applet.AppletClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.applet.AppletClassLoader.loadCode(Unknown Source)
at sun.applet.AppletPanel.createApplet(Unknown Source)
at sun.plugin.AppletViewer.createApplet(Unknown Source)
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at sun.applet.AppletPanel.run(Unknown Source)
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I found that the problem was something in my HTML file.
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<meta HTTP-EQUIV="Expires" CONTENT="-1">
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Servlet/applet problem

hi guys
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how looks like my codebase?
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<filter>
<filter-name>TestFilter</filter-name>
<display-name>TestFilter</display-name>
<description>
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<filter-mapping>
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Message was edited by:
Anant

Hi I was wondering if you had any luck with this issues.
Thank you.

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hello
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Hi, thanks for the reply, let me clarify, the main
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applet during runtime. The Thread Class is simply an
object extending the Thread java class.
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Hi everyone,
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