Member Avatar for Bartosz

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)

Client:

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

Server

 ServerSocket server = new ServerSocket(1025); Socket socket = server.accept(); ObjectInputStream in = new ObjectInputStream(socket.getInputStream()); //Receive Server messageObject = (Server) in.readObject(); System.out.println(messageObject); //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 ?

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  • Latest Post Latest Post by JamesCherrill
Member Avatar for JamesCherrill

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

Member Avatar for Bartosz

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

Member Avatar for Bartosz

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??

Thanks

Member Avatar for JamesCherrill

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

Member Avatar for Bartosz

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

Member Avatar for JamesCherrill

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

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