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POSending ArrayList from server side to client side using TCP over socket
 

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  1. POSending ArrayList from server side to client side using TCP over socket
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    <p>I'm trying to send an Object from Server Side to Client Side but i can't find the problem. Here is the error I'm getting on the Client side:</p> <pre><code>java.io.StreamCorruptedException: invalid type code: 43 at java.io.ObjectInputStream.readObject0(Unknown Source) at java.io.ObjectInputStream.readObject(Unknown Source) at connection.MainClient.doAll(MainClient.java:56) at connection.TestScreen$2.actionPerformed(TestScreen.java:82) at javax.swing.AbstractButton.fireActionPerformed(Unknown Source) at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source) at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source) at javax.swing.DefaultButtonModel.setPressed(Unknown Source) at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source) at java.awt.Component.processMouseEvent(Unknown Source) at javax.swing.JComponent.processMouseEvent(Unknown Source) at java.awt.Component.processEvent(Unknown Source) at java.awt.Container.processEvent(Unknown Source) at java.awt.Component.dispatchEventImpl(Unknown Source) at java.awt.Container.dispatchEventImpl(Unknown Source) at java.awt.Component.dispatchEvent(Unknown Source) at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source) at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source) at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source) at java.awt.Container.dispatchEventImpl(Unknown Source) at java.awt.Window.dispatchEventImpl(Unknown Source) at java.awt.Component.dispatchEvent(Unknown Source) at java.awt.EventQueue.dispatchEventImpl(Unknown Source) at java.awt.EventQueue.access$200(Unknown Source) at java.awt.EventQueue$3.run(Unknown Source) at java.awt.EventQueue$3.run(Unknown Source) at java.security.AccessController.doPrivileged(Native Method) at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source) at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source) at java.awt.EventQueue$4.run(Unknown Source) at java.awt.EventQueue$4.run(Unknown Source) at java.security.AccessController.doPrivileged(Native Method) at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source) at java.awt.EventQueue.dispatchEvent(Unknown Source) at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source) at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source) at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source) at java.awt.EventDispatchThread.pumpEvents(Unknown Source) at java.awt.EventDispatchThread.pumpEvents(Unknown Source) at java.awt.EventDispatchThread.run(Unknown Source) </code></pre> <p>Here below is the Server Side method: The seperate method in the Infinite loop is just reading from a file and parsing the Usernames and passwords to ArrayList that are instance variables in the Server class. </p> <pre><code> public void doStuff() throws Exception { ServerSocket serverSocket = new ServerSocket(5001); Socket clientSocket = serverSocket.accept(); PrintWriter out = new PrintWriter(clientSocket.getOutputStream(), true); BufferedReader in = new BufferedReader( new InputStreamReader( clientSocket.getInputStream())); ObjectOutputStream objectOutput = new ObjectOutputStream(clientSocket.getOutputStream()); String inputLine; out.println("Connected"); while(true) { seperate(); while ((inputLine = in.readLine()) != null) { if(inputLine.equalsIgnoreCase("users")) objectOutput.writeObject(getUserNames()); else if(inputLine.equalsIgnoreCase("pass")) objectOutput.writeObject(getPassWords()); else if(inputLine.equalsIgnoreCase("stop")) objectOutput.reset(); } } } </code></pre> <p>Here below is the client side requesting the info from the server:</p> <pre><code>public boolean doAll(String name, String pass) throws Exception { try { kkSocket = new Socket("PC", 5001); out = new PrintWriter(kkSocket.getOutputStream(), true); in = new BufferedReader(new InputStreamReader(kkSocket.getInputStream())); } catch (UnknownHostException e) { System.err.println("Don't know about host: PC."); System.exit(1); } catch (IOException e) { System.err.println("Couldn't get I/O for the connection to: PC."); System.exit(1); } ObjectInputStream objectInput = new ObjectInputStream(kkSocket.getInputStream()); out.println("user"); Object obj = objectInput.readObject(); users = (ArrayList&lt;String&gt;)obj; out.println("pass"); obj = objectInput.readObject(); this.pass = (ArrayList&lt;String&gt;)obj; out.println("stop"); objectInput.close(); out.close(); in.close(); kkSocket.close(); if(userIsRegistered(name,pass)) return true; return false; } </code></pre> <p>I am new at learning Server sockets and sockets but what i am trying to accomplish here is this. When I press a button in another class I do this:</p> <pre><code>MainClient b = new MainClient(); login = b.doAll(userField.getText(),passField.getText()); Login is obviously a boolean. </code></pre> <p>Pretty much a login system over server to cleint where when the login button is pressed it invokes a client to connect to this server and get the list of Users and Passes on the server that is stored in a text file in the specified directory. Then when the client recieves this information it checks if it could possibly be a user from the Strings i get form the two text fields and returns true or false. Then closes the socket to the server and it should just keep reconnecting everytime right ?</p> <p>My main problem is how do you fix the error it keeps throwing ?</p>
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    1. COLooks similar to http://stackoverflow.com/questions/2393179/streamcorruptedexception-invalid-type-code-ac
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    2. CO@Chuck Norris writes **perfect** code the first time around. Bugs are afraid of his roundhouse kicks, hence why his code has no bugs.
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    3. CO@Chuck Norris bugs is considered a feature. A feature that is needed for all developers.
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