자판기 네트워크 프로그래밍에서 java.io.NotSerializableException 예외 및 서버 GUI 하얀 화면 문제 해결 방법

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안녕하세요, 현재 텀프로젝트로 자판기 네트워크 프로그래밍을 진행 중입니다. 서버와 클라이언트 간의 통신을 위해 소켓 프로그래밍을 사용하고 있으며, 자판기의 판매 데이터와 재고 데이터를 관리하고 있습니다. 서버 관련 GUI와 네트워킹 쪽은 ChatGPT를 활용해서 하고 있었습니다. 프로그램 실행 중 두 가지 문제가 발생하여 해결 방법을 찾지 못하고 있습니다. 아래는 관련된 코드와 오류 메시지입니다. 가장 큰 문제는 아래와 같이 ServerGUI가 하얀 화면으로 아예 나타나질 않습니다.오늘까지 텀프를 내야하는데 며칠째 해결을 못해서 좀 이제 해결하고 내고 자고싶습니다.. 제발 도와주세요 ㅠㅠㅠ 자세한 코드는 아래 깃허브 주소에 있습니다.https://github.com/Ogu1208/VendingMachine-Network-Programming/tree/server-gui-error-Serializable-error문제 1: java.io.NotSerializableException 예외java.io.WriteAbortedException: writing aborted; java.io.NotSerializableException: Coin.Coin at java.base/java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1751) at java.base/java.io.ObjectInputStream.readObject(ObjectInputStream.java:514) at java.base/java.io.ObjectInputStream.readObject(ObjectInputStream.java:472) at java.base/java.util.ArrayList.readObject(ArrayList.java:899) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77) at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.base/java.lang.reflect.Method.invoke(Method.java:568) at java.base/java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:1231) at java.base/java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:2434) at java.base/java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:2268) at java.base/java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1744) at java.base/java.io.ObjectInputStream.readObject(ObjectInputStream.java:514) at java.base/java.io.ObjectInputStream.readObject(ObjectInputStream.java:472) at Machine.MachinePanelRight.loadInventoryData(MachinePanelRight.java:386) at Machine.MachinePanelRight.(MachinePanelRight.java:193) at Machine.MachineFrame.(MachineFrame.java:56) at client.Client1.start(Client1.java:24) at client.Client1.main(Client1.java:19)Caused by: java.io.NotSerializableException: Coin.Coin at java.base/java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1197) at java.base/java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:354) at java.base/java.util.ArrayList.writeObject(ArrayList.java:866) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77) at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.base/java.lang.reflect.Method.invoke(Method.java:568) at java.base/java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:1201) at java.base/java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1526) at java.base/java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1448) at java.base/java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1191) at java.base/java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:354) at Machine.MachinePanelRight.saveInventoryData(MachinePanelRight.java:395) at Machine.MachinePanelRight.actionPerformed(MachinePanelRight.java:229) at java.desktop/javax.swing.JTextField.fireActionPerformed(JTextField.java:525) at java.desktop/javax.swing.JTextField.postActionEvent(JTextField.java:740) at java.desktop/javax.swing.JTextField$NotifyAction.actionPerformed(JTextField.java:856) at java.desktop/javax.swing.SwingUtilities.notifyAction(SwingUtilities.java:1810) at java.desktop/javax.swing.JComponent.processKeyBinding(JComponent.java:2947) at java.desktop/javax.swing.JComponent.processKeyBindings(JComponent.java:2995) at java.desktop/javax.swing.JComponent.processKeyEvent(JComponent.java:2909) at java.desktop/java.awt.Component.processEvent(Component.java:6403) at java.desktop/java.awt.Container.processEvent(Container.java:2266) at java.desktop/java.awt.Component.dispatchEventImpl(Component.java:5001) at java.desktop/java.awt.Container.dispatchEventImpl(Container.java:2324) at java.desktop/java.awt.Component.dispatchEvent(Component.java:4833) at java.desktop/java.awt.KeyboardFocusManager.redispatchEvent(KeyboardFocusManager.java:1952) at java.desktop/java.awt.DefaultKeyboardFocusManager.dispatchKeyEvent(DefaultKeyboardFocusManager.java:883) at java.desktop/java.awt.DefaultKeyboardFocusManager.preDispatchKeyEvent(DefaultKeyboardFocusManager.java:1150) at java.desktop/java.awt.DefaultKeyboardFocusManager.typeAheadAssertions(DefaultKeyboardFocusManager.java:1020) at java.desktop/java.awt.DefaultKeyboardFocusManager.dispatchEvent(DefaultKeyboardFocusManager.java:848) at java.desktop/java.awt.Component.dispatchEventImpl(Component.java:4882) at java.desktop/java.awt.Container.dispatchEventImpl(Container.java:2324) at java.desktop/java.awt.Component.dispatchEvent(Component.java:4833) at java.desktop.java.awt.EventQueue.dispatchEventImpl(EventQueue.java:773) at java.desktop.java.awt.EventQueue$4.run(EventQueue.java:722) at java.desktop.java.awt.EventQueue$4.run(EventQueue.java:716) at java.base.java.security.AccessController.doPrivileged(AccessController.java:399) at java.base.java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:86) at java.base.java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:97) at java.desktop.java.awt.EventQueue$5.run(EventQueue.java:746) at java.desktop.java.awt.EventQueue$5.run(EventQueue.java:744) at java.base.java.security.AccessController.doPrivileged(AccessController.java:399) at java.base.java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:86) at java.desktop.java.awt.EventQueue.dispatchEvent(EventQueue.java:743) at java.desktop.java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:203) at java.desktop.java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:124) at java.desktop.java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:113) at java.desktop.java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:109) at java.desktop.java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101) at java.desktop.java.awt.EventDispatchThread.run(EventDispatchThread.java:90)서버로부터 받은 데이터: SalesData{clientId='client1', canName='커피', quantitySold=5, totalSales=500, date='2024-06-14'}문제 2: 서버 GUI가 하얀 화면으로 표시 서버 프로그램을 실행하면 GUI가 하얀 화면으로 표시되고 아무런 내용도 보이지 않습니다. 아래는 서버와 GUI의 관련된 코드입니다.public class Server1 { private static final int SERVER_PORT = 12345; // 서버 포트 번호 private final List salesDataList = Collections.synchronizedList(new ArrayList<>()); private final List clientHandlers = new ArrayList<>(); private VendingMachineServerGUI serverGUI; public static void main(String[] args) { SwingUtilities.invokeLater(() -> new Server1().start()); } public void start() { serverGUI = new VendingMachineServerGUI(this); // Load initial sales data loadInitialSalesData(); try (ServerSocket serverSocket = new ServerSocket(SERVER_PORT)) { System.out.println("서버가 시작되었습니다."); while (true) { Socket clientSocket = serverSocket.accept(); ClientHandler clientHandler = new ClientHandler(clientSocket, this); clientHandlers.add(clientHandler); clientHandler.start(); } } catch (IOException e) { e.printStackTrace(); } } private void loadInitialSalesData() { File salesDataFile = new File("sales_data.dat"); if (salesDataFile.exists()) { try (ObjectInputStream ois = new ObjectInputStream(new FileInputStream(salesDataFile))) { List initialSalesData = (List) ois.readObject(); salesDataList.addAll(initialSalesData); SwingUtilities.invokeLater(() -> { serverGUI.refreshSalesData(); serverGUI.refreshStockData(); }); } catch (IOException | ClassNotFoundException e) { e.printStackTrace(); } } } private void saveSalesData() { try (ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream("sales_data.dat"))) { synchronized (salesDataList) { oos.writeObject(new ArrayList<>(salesDataList)); } } catch (IOException e) { e.printStackTrace(); } } public List getSalesDataList() { return salesDataList; } private static class ClientHandler extends Thread { private final Socket clientSocket; private final Server1 server; public ClientHandler(Socket clientSocket, Server1 server) { this.clientSocket = clientSocket; this.server = server; } @Override public void run() { try (ObjectOutputStream out = new ObjectOutputStream(clientSocket.getOutputStream()); ObjectInputStream in = new ObjectInputStream(clientSocket.getInputStream())) { while (true) { // 클라이언트로부터 데이터 수신 SalesData salesData = (SalesData) in.readObject(); System.out.println("클라이언트로부터 받은 데이터: " + salesData); // 데이터 처리 synchronized (server.salesDataList) { server.salesDataList.add(salesData); } server.saveSalesData(); // 클라이언트에 업데이트된 데이터 전송 out.writeObject(salesData); out.flush(); // GUI 갱신 SwingUtilities.invokeLater(() -> { server.serverGUI.refreshSalesData(); server.serverGUI.refreshStockData(); }); } } catch (IOException | ClassNotFoundException e) { e.printStackTrace(); } } } } public class VendingMachineServerGUI extends JFrame { private JTextArea textArea; private JTabbedPane tabbedPane; private JTable salesTable; private JTable stockTable; private DefaultTableModel salesTableModel; private DefaultTableModel stockTableModel; private Server1 server; public VendingMachineServerGUI(Server1 server) { this.server = server; setTitle("Vending Machine Server"); setSize(800, 600); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); tabbedPane = new JTabbedPane(); add(tabbedPane, BorderLayout.CENTER); // Sales Data Panel JPanel salesPanel = new JPanel(new BorderLayout()); salesTableModel = new DefaultTableModel(new String[]{"날짜", "음료", "매출액", "판매량"}, 0); salesTable = new JTable(salesTableModel); salesPanel.add(new JScrollPane(salesTable), BorderLayout.CENTER); JPanel salesButtonPanel = new JPanel(); JButton btnRefreshSales = new JButton("Refresh Sales Data"); btnRefreshSales.addActionListener(e -> refreshSalesData()); salesButtonPanel.add(btnRefreshSales); salesPanel.add(salesButtonPanel, BorderLayout.SOUTH); tabbedPane.addTab("Sales Data", salesPanel); // Stock Data Panel JPanel stockPanel = new JPanel(new BorderLayout()); stockTableModel = new DefaultTableModel(new String[]{"음료", "재고"}, 0); stockTable = new JTable(stockTableModel); stockPanel.add(new JScrollPane(stockTable), BorderLayout.CENTER); JPanel stockButtonPanel = new JPanel(); JButton btnRefreshStock = new JButton("Refresh Stock Data"); btnRefreshStock.addActionListener(e -> refreshStockData()); stockButtonPanel.add(btnRefreshStock); stockPanel.add(stockButtonPanel, BorderLayout.SOUTH); tabbedPane.addTab("Stock Data", stockPanel); // Notification Panel JPanel notificationPanel = new JPanel(new BorderLayout()); textArea = new JTextArea(); textArea.setEditable(false); notificationPanel.add(new JScrollPane(textArea), BorderLayout.CENTER); tabbedPane.addTab("Notifications", notificationPanel); setVisible(true); } public void refreshSalesData() { List salesDataList = server.getSalesDataList(); salesTableModel.setRowCount(0); // Clear existing data // Aggregate sales data Map aggregatedData = new TreeMap<>(); for (SalesData salesData : salesDataList) { String key = salesData.getDate() + "_" + salesData.getCanName(); aggregatedData.putIfAbsent(key, new int[2]); aggregatedData.get(key)[0] += salesData.getTotalSales(); aggregatedData.get(key)[1] += salesData.getQuantitySold(); } // Add aggregated data to table for (Map.Entry entry : aggregatedData.entrySet()) { String[] keyParts = entry.getKey().split("_"); String date = keyParts[0]; String canName = keyParts[1]; int totalSales = entry.getValue()[0]; int quantitySold = entry.getValue()[1]; salesTableModel.addRow(new Object[]{date, canName, totalSales, quantitySold}); } } public void refreshStockData() { List canList = CanArray.canList; stockTableModel.setRowCount(0); // Clear existing data for (Can can : canList) { stockTableModel.addRow(new Object[]{can.getCanName(), can.getCanNum()}); } // Check for low stock and notify for (Can can : canList) { if (can.getCanNum() < 5) { // Threshold for low stock textArea.append("Warning: Low stock for " + can.getCanName() + " "); } } } }

younghoo · Answer

1 번 문제 참고해 보세요 https://chati.tistory.com/149

자판기 네트워크 프로그래밍에서 java.io.NotSerializableException 예외 및 서버 GUI 하얀 화면 문제 해결 방법

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