Problem With ObjectSream and GUI

Question

Hi
I had a problem with the sendBtn ActionListener. When i press the send button the application freeze and the button freeze pressed.
But when i put some code to do the same think that send button should do, into the main method everything works fine. Any help?
Thanks in advanced and sorry for my english
//Some imports
public class SampleCommunicationAgentGUI extends BaseCommunicationAgent {
     public SampleCommunicationAgentGUI(String name) {
          super(name);
          try {
               connectToACS("127.0.0.1", 3333);
          } catch (IOException e) {
               System.out.print("\nNetwork error while connecting to ACS ("
                         + e.getMessage() + ")");
          } catch (ClassNotFoundException e) {
               System.out.print("\nNetwork error while connecting to ACS ("
                         + e.getMessage() + ")");
          frame = new SampleAgentFrame(name);
          frame.sendBtn.addActionListener(new java.awt.event.ActionListener() {
               public void actionPerformed(java.awt.event.ActionEvent evt) {
                    KQML message = new KQML();
                    message.setSender(getName());
                    message.setReceiver(frame.receiverField.getText());
                    message.setContent(frame.contentField.getText());
                    message.setInReplyTo(frame.inReplyToField.getText());
                    message.setLanguage(frame.languageField.getText());
                    message.setOntology(frame.ontologyField.getText());
                    message.setPerformative(frame.perfomativeField.getText());
                    message.setReplyWith(frame.inReplayWithField.getText());
                    System.out.println(message.getTotalMsg());
                    try {
                         sendMessage(message); // A method of BaseCommunicationAgent
                    } catch (Exception e) {
                         e.printStackTrace();
          frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
          frame.validate();
          frame.setLocationRelativeTo(null);
          frame.setVisible(true);
     public static SampleAgentFrame frame;
     public static void main(String[] args) {
          KQML message;
          SampleCommunicationAgentGUI agent = new SampleCommunicationAgentGUI("Chris");
          if (!agent.getACSStatus().equals(ACSStatus.CONNECTED)) {
               System.out.println("\nERROR: Could not connect on ACS!");
               return;
          /*If i put this code here everything works fine
                * message = new KQML();
                * agent.sendMessage(message);
          while (true) {
               message = agent.getMessage();
               frame.messageTextArea.append(message.getContent() + "\r\n");
     protected static class SampleAgentFrame extends JFrame {
          //Some variables
          public SampleAgentFrame(String name) {
               setTitle(name);
               initComponents(name);
           * Initializes the GUI.
          private void initComponents(String name) {
               //Inits the GUI but is to big to post it.
}And the BaseCommunicationAgent
//Some imports
public class BaseCommunicationAgent extends BaseAgent {
     public static enum ACSStatus {
          INITIALIZING, INITIALIZED, CONNECTING, CONNECTED
     private Socket socketACS;
     private ObjectOutputStream dataOut;
     private ObjectInputStream dataIn;
     protected ACSStatus statusACS;
     private KQML kqmlMessage;
     public BaseCommunicationAgent(String name) {
          super(name);
          statusACS = ACSStatus.INITIALIZING;
          socket = null;
          dataOut = null;
          dataOut = null;
          kqmlMessage = null;
          statusACS = ACSStatus.INITIALIZED;
     protected synchronized boolean connectToACS(String address, int port)
               throws IOException, ClassNotFoundException {
          try {
               statusACS = ACSStatus.CONNECTING;
               socketACS = new Socket(address, port);
               dataOut = new ObjectOutputStream(socketACS.getOutputStream());
               dataIn = new ObjectInputStream(socketACS.getInputStream());
               kqmlMessage = new KQML();
               KQML message;
               boolean isComment;
               do {
                    message = (KQML) dataIn.readObject();
                    isComment = message.getPerformative().equals("comment");
                    if (isComment) {
                         System.out.println(message.getContent());
               } while (isComment);
               if (message.getPerformative().equals("identify")) {
                    kqmlMessage.resetMessage();
                    kqmlMessage.setPerformative("who-am-i");
                    kqmlMessage.setSender(getName());
                    dataOut.writeObject(kqmlMessage);
                    dataOut.flush();
                    dataOut.reset();
                    do {
                         message = (KQML) dataIn.readObject();
                         isComment = message.getPerformative().equals("comment");
                         if (isComment) {
                              System.out.println(message.getContent());
                    } while (isComment);
                    if (message.getPerformative().equals("registered")) {
                         statusACS = ACSStatus.CONNECTED;
                    } else {
                         System.out.println(message.getContent());
                         socketACS.close();
                         statusACS = ACSStatus.INITIALIZING;
               } else {
                    System.out.println(message.getContent());
                    socketACS.close();
                    statusACS = ACSStatus.INITIALIZING;
          } catch (IOException e) {
               statusACS = ACSStatus.INITIALIZING;
               throw e;
          } catch (ClassNotFoundException e) {
               statusACS = ACSStatus.INITIALIZING;
               throw e;
          return statusACS.equals(ACSStatus.CONNECTED);
     public ACSStatus getACSStatus() {
          return statusACS;
     protected synchronized void closeConnectionWithACS() { // Only the
                                                                           // dataOut.close()
          try {
               dataOut.flush();
               dataOut.close();
               dataIn.close();
               socketACS.close();
          } catch (IOException ex) {
               ex.printStackTrace();
     protected synchronized void sendMessage(KQML message) throws IOException {
          dataOut.writeObject(message);
          dataOut.flush();
          dataOut.reset();
     protected synchronized KQML getMessage() {
          KQML message = new KQML();
          try {
               message = (KQML) dataIn.readObject();
               return message;
          } catch (IOException e) {
               e.printStackTrace();
          } catch (ClassNotFoundException e) {
               e.printStackTrace();
          return message;
}

Answer 1

Thanks for the answer. I take a look at Swing Worker but i have a few problems :
1)The GUI doesn't freeze but nothing happens either.
2) When i remove the sendMessage method and i put only a System.out.println(somethingToPrint); it works but only once. After i hit second time my send button nothing happens. Somewhere i read that works only once is that true or i misunderstood? And if yes how i can do it every time i press the send button?
Could you take a look at my code?
Thanks in advanced
//Some imports
public class SampleCommunicationAgentGUI extends BaseCommunicationAgent {
     public SampleCommunicationAgentGUI(String name) {
          super(name);
          try {
               // agent.connectToREVE("127.0.0.1", 4444);
               connectToACS("127.0.0.1", 3333);
          } catch (IOException e) {
               System.out.print("\nNetwork error while connecting to ACS ("
                         + e.getMessage() + ")");
          } catch (ClassNotFoundException e) {
               System.out.print("\nNetwork error while connecting to ACS ("
                         + e.getMessage() + ")");
            final SwingWorker worker =
                new SwingWorker() {
                    @Override
                    protected KQML doInBackground() throws Exception {
                         KQML message = new KQML();
                         message.setSender(getName());
                         message.setReceiver(frame.receiverField.getText());
                         message.setContent(frame.contentField.getText());
                         message.setInReplyTo(frame.inReplyToField.getText());
                         message.setLanguage(frame.languageField.getText());
                         message.setOntology(frame.ontologyField.getText());
                         message.setPerformative(frame.perfomativeField.getText());
                         message.setReplyWith(frame.inReplayWithField.getText());
                         System.out.println(message.getTotalMsg());
                         sendMessage(message);
                         return message;
          frame = new SampleAgentFrame(name);
          frame.sendBtn.addActionListener(new java.awt.event.ActionListener() {
               public void actionPerformed(java.awt.event.ActionEvent evt) {
                    try{
                         worker.execute();
                    } catch (Exception e) {
                         e.printStackTrace();
          frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
          frame.validate();
          frame.setLocationRelativeTo(null);
          frame.setVisible(true);
     public static SampleAgentFrame frame;
     public static void main(String[] args) {
          KQML message;
          SampleCommunicationAgentGUI agent = new SampleCommunicationAgentGUI("Chris");
          if (!agent.getACSStatus().equals(ACSStatus.CONNECTED)) {
               System.out.println("\nERROR: Could not connect on ACS!");
               return;
          while (true) {
               message = agent.getMessage();
               frame.messageTextArea.append(message.getContent() + "\r\n");
     protected static class SampleAgentFrame extends JFrame {
          //Some variables
          public SampleAgentFrame(String name) {
               setTitle(name);
               initComponents(name);
           * Initializes the GUI.
          private void initComponents(String name) {
               //Init components
}