Hi there,
I have two seperate programs - one is a Client, and the other one is Server. I am trying to send an object from Client to Server, but I am getting following error:

Exception in thread "main" java.lang.ClassNotFoundException: airtrafficcontrol.AirplaneDetails
    at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
    at java.lang.Class.forName0(Native Method)
    at java.lang.Class.forName(Class.java:348)
    at java.io.ObjectInputStream.resolveClass(ObjectInputStream.java:626)
    at java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1613)
    at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1518)
    at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1774)
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1351)
    at java.io.ObjectInputStream.readObject(ObjectInputStream.java:371)
    at server.Server.main(Server.java:34)


 String make = tfMake.getText().trim();
            String airlanes = tfAirlanes.getText().trim();
            String to = tfTo.getText().trim();
            String from = tfFrom.getText().trim();
            out = new ObjectOutputStream(socket.getOutputStream());
            AirplaneDetails airplaneDetails = new AirplaneDetails(make, airlanes, to, from);

            } catch (IOException ex) {
                System.out.println("Something went wrong...");
            } catch (ClassNotFoundException ex) {
                Logger.getLogger(AirTrafficControl.class.getName()).log(Level.SEVERE, null, ex);


 ServerSocket server = new ServerSocket(1025);
        Socket socket = server.accept();
        ObjectInputStream in = new ObjectInputStream(socket.getInputStream());
        Server messageObject = (Server) in.readObject();


    //radius = in.readObject();
        ObjectOutputStream out = new ObjectOutputStream(socket.getOutputStream());
       // double area = radius * 100; 
    System.out.println("Received at: " + new Date() );

Any idea how to solve it ?

Seems like the server is running on a machine that does not have that class in its classpath

I have a class called AirplaneDetails on Client side, but do not have on Server side..

Do I need to have AirplaneDetails on a server and client side ?? On Client side in AirplaneDetails class I have constructor and some getters to be able to create an object..

I guess I dont need again getters and setters on the server side.. Am I right ? If so, what should go in the AirplaneDetails class on Server side??


You need that class (exactly the same version) on both machines.

I have the same classes on both machines, but still I am getting exactly the same error

It looks like AirplaneDetails is an inner class of airtrafficcontrol (?), so you will need the whole airtrafficcontrol class on both machines.