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POHow do I solve this serialization error on my log in/create account program?
 

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  1. POHow do I solve this serialization error on my log in/create account program?
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    <p>I'm writing a simple GUI program that uses log in information from a text file. It takes log in info from another GUI program that create's user accounts. I'm not sure how to easily serialize this effectively, as it's only something that I've learned recently. What should I do? How do I solve this serialization error, and what can I do to improve it and make it functional. </p> <p>User class:</p> <pre><code>package passwordProgram; import java.util.ArrayList; import java.util.Arrays; import java.awt.BorderLayout; import java.awt.Color; import java.awt.GridBagConstraints; import java.awt.GridBagLayout; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.io.Serializable; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JPanel; import javax.swing.JPasswordField; import javax.swing.JTextField; import javax.swing.UIManager; public class User implements Serializable, ActionListener { public static ArrayList&lt;String&gt; allUsernames = new ArrayList&lt;String&gt;(); String username; String password; public static void main(String[] args) { try { UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName()); } catch (Exception e) { e.printStackTrace(); } User user = new User(); user.mainGUI(); } JFrame frame; JPanel panel; JTextField createUsername; JPasswordField createPassword; JPasswordField confirmPassword; JButton createAccount; JLabel noValid; public void mainGUI() { noValid = new JLabel(); frame = new JFrame("Create a new account!"); panel = new JPanel(); panel.setBackground(Color.ORANGE); createPassword = new JPasswordField(10); confirmPassword = new JPasswordField(10); createUsername = new JTextField(10); JLabel userTxt = new JLabel("New Username: "); JLabel userPass = new JLabel("New Password: "); JLabel confirmPass = new JLabel("Confirm Password: "); createAccount = new JButton("Create your account!"); panel.setLayout(new GridBagLayout()); GridBagConstraints left = new GridBagConstraints(); left.anchor = GridBagConstraints.WEST; GridBagConstraints right = new GridBagConstraints(); right.anchor = GridBagConstraints.EAST; right.weightx = 2.0; right.fill = GridBagConstraints.HORIZONTAL; right.gridwidth = GridBagConstraints.REMAINDER; frame.getContentPane().add(BorderLayout.NORTH, noValid); frame.getContentPane().add(BorderLayout.CENTER, panel); panel.add(userTxt, left); panel.add(createUsername, right); panel.add(userPass, left); panel.add(createPassword, right); panel.add(confirmPass, left); panel.add(confirmPassword, right); frame.getContentPane().add(BorderLayout.SOUTH, createAccount); frame.setVisible(true); frame.setSize(500, 300); createAccount.addActionListener(this); } public void actionPerformed(ActionEvent event) { if (createUsername.getText().length() &lt;= 0 ) { noValid.setText("That is not a valid username. Please try again."); frame.getContentPane().add(BorderLayout.NORTH, noValid); } else if (allUsernames.contains(createUsername.getText())) { noValid.setText("That username is already taken. Please try again."); frame.getContentPane().add(BorderLayout.NORTH, noValid); } else if (!(Arrays.equals(createPassword.getPassword(), confirmPassword.getPassword()))) { noValid.setText("Your passwords do not match!"); frame.getContentPane().add(BorderLayout.NORTH, noValid); } else { SaveUser sUser = new SaveUser(); sUser.createAccount(this); noValid.setText("Account created successfully"); frame.getContentPane().add(BorderLayout.NORTH, noValid); } } } </code></pre> <p>SaveUser class(serialization)</p> <pre><code>package passwordProgram; import java.io.FileOutputStream; import java.io.ObjectOutputStream; import java.io.Serializable; public class SaveUser implements Serializable{ public void createAccount(User u) { try { FileOutputStream fileOS = new FileOutputStream("userInfo.ser"); ObjectOutputStream objectOS = new ObjectOutputStream(fileOS); objectOS.writeObject(u); objectOS.close(); } catch (Exception e) { e.printStackTrace(); } } } </code></pre> <p>Here's the error I get when I try and run the User class.</p> <pre><code>java.io.NotSerializableException: passwordProgram.User at java.io.ObjectOutputStream.writeObject0(Unknown Source) at java.io.ObjectOutputStream.writeObject(Unknown Source) at passwordProgram.SaveUser.createAccount(SaveUser.java:12) at passwordProgram.User.actionPerformed(User.java:104) at javax.swing.AbstractButton.fireActionPerformed(Unknown Source) at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source) at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source) at javax.swing.DefaultButtonModel.setPressed(Unknown Source) at javax.swing.AbstractButton.doClick(Unknown Source) at javax.swing.plaf.basic.BasicRootPaneUI$Actions.actionPerformed(Unknown Source) at javax.swing.SwingUtilities.notifyAction(Unknown Source) at javax.swing.JComponent.processKeyBinding(Unknown Source) at javax.swing.KeyboardManager.fireBinding(Unknown Source) at javax.swing.KeyboardManager.fireKeyboardAction(Unknown Source) at javax.swing.JComponent.processKeyBindingsForAllComponents(Unknown Source) at javax.swing.JComponent.processKeyBindings(Unknown Source) at javax.swing.JComponent.processKeyEvent(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.KeyboardFocusManager.redispatchEvent(Unknown Source) at java.awt.DefaultKeyboardFocusManager.dispatchKeyEvent(Unknown Source) at java.awt.DefaultKeyboardFocusManager.preDispatchKeyEvent(Unknown Source) at java.awt.DefaultKeyboardFocusManager.typeAheadAssertions(Unknown Source) at java.awt.DefaultKeyboardFocusManager.dispatchEvent(Unknown Source) at java.awt.Component.dispatchEventImpl(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$000(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>And here's my log in class:</p> <p>package passwordProgram;</p> <pre><code>import java.awt.BorderLayout; import java.awt.Color; import java.awt.GridBagConstraints; import java.awt.GridBagLayout; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.io.FileInputStream; import java.io.ObjectInputStream; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JPanel; import javax.swing.JPasswordField; import javax.swing.JTextField; import javax.swing.UIManager; public class LogInScreen implements ActionListener { public static void main(String[] args) { try { UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName()); } catch (Exception e) { } LogInScreen logger = new LogInScreen(); logger.start(); } </code></pre>
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      1. POHow do I solve this serialization error on my log in/create account program?
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    1. COtake the user info to a separate class and encapsulate the details within that class. So the User class will only have the userName and password as per your example. Then do the GUI creation and your main method in a separate class. Make the User class Serializable with its own fields.
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      1. POHow do I solve this serialization error on my log in/create account program?
      1. USdinukadev
    2. CO@dinukadev So the best thing to do would basically be to re-write the program? I'm fine with that, it's just a toy, but I need confirmation on that.
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      1. POHow do I solve this serialization error on my log in/create account program?
      1. UShasherr
    3. COIf your goal is to store the user name and password as part of the state of an object then yes i believe you should encapsulate only the user name and password to a separete class and write that object to the output stream. Other SO members can give their advice on this as well so you can make a more sound judgement on how to move forward :)
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      1. POHow do I solve this serialization error on my log in/create account program?
      1. USdinukadev
 

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