[Java] Zapis do pliku.

kt1117 · 5 Lipca 2011

Witam was raz jeszcze, mam nowy problem z Javą. Postanowiłem napisać program obsługujący bazę danych. Oto kod:

BibliotekaAboutBox.java

/*
* BibliotekaAboutBox.java
*/

package biblioteka;

import org.jdesktop.application.Action;

public class BibliotekaAboutBox extends javax.swing.JDialog {

    public BibliotekaAboutBox(java.awt.Frame parent) {
        super(parent);
        initComponents();
        getRootPane().setDefaultButton(closeButton);
    }

    @Action public void closeAboutBox() {
        dispose();
    }

    /** This method is called from within the constructor to
     * initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is
     * always regenerated by the Form Editor.
     */
    // <editor-fold defaultstate="collapsed" desc="Generated Code">                          
    private void initComponents() {

        jPanel1 = new javax.swing.JPanel();
        jPanel2 = new javax.swing.JPanel();
        javax.swing.JLabel appTitleLabel = new javax.swing.JLabel();
        javax.swing.JLabel appVersionLabel = new javax.swing.JLabel();
        javax.swing.JLabel versionLabel = new javax.swing.JLabel();
        javax.swing.JLabel vendorLabel = new javax.swing.JLabel();
        javax.swing.JLabel appVendorLabel = new javax.swing.JLabel();
        javax.swing.JLabel appDescLabel = new javax.swing.JLabel();
        closeButton = new javax.swing.JButton();

        jPanel1.setName("jPanel1"); // NOI18N

        javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);
        jPanel1.setLayout(jPanel1Layout);
        jPanel1Layout.setHorizontalGroup(
            jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGap(0, 100, Short.MAX_VALUE)
        );
        jPanel1Layout.setVerticalGroup(
            jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGap(0, 100, Short.MAX_VALUE)
        );

        setDefaultCloseOperation(javax.swing.WindowConstants.DISPOSE_ON_CLOSE);
        org.jdesktop.application.ResourceMap resourceMap = org.jdesktop.application.Application.getInstance(biblioteka.BibliotekaApp.class).getContext().getResourceMap(BibliotekaAboutBox.class);
        setTitle(resourceMap.getString("title")); // NOI18N
        setBackground(resourceMap.getColor("aboutBox.background")); // NOI18N
        setForeground(resourceMap.getColor("aboutBox.foreground")); // NOI18N
        setIconImages(null);
        setModal(true);
        setName("aboutBox"); // NOI18N
        setResizable(false);

        jPanel2.setBackground(resourceMap.getColor("jPanel2.background")); // NOI18N
        jPanel2.setName("jPanel2"); // NOI18N

        appTitleLabel.setFont(appTitleLabel.getFont().deriveFont(appTitleLabel.getFont().getStyle() | java.awt.Font.BOLD, appTitleLabel.getFont().getSize()+4));
        appTitleLabel.setText(resourceMap.getString("Application.title")); // NOI18N
        appTitleLabel.setName("appTitleLabel"); // NOI18N

        appVersionLabel.setText(resourceMap.getString("Application.version")); // NOI18N
        appVersionLabel.setName("appVersionLabel"); // NOI18N

        versionLabel.setFont(versionLabel.getFont().deriveFont(versionLabel.getFont().getStyle() | java.awt.Font.BOLD));
        versionLabel.setText(resourceMap.getString("versionLabel.text")); // NOI18N
        versionLabel.setName("versionLabel"); // NOI18N

        vendorLabel.setFont(vendorLabel.getFont().deriveFont(vendorLabel.getFont().getStyle() | java.awt.Font.BOLD));
        vendorLabel.setText(resourceMap.getString("vendorLabel.text")); // NOI18N
        vendorLabel.setName("vendorLabel"); // NOI18N

        appVendorLabel.setText(resourceMap.getString("Application.vendor")); // NOI18N
        appVendorLabel.setName("appVendorLabel"); // NOI18N

        appDescLabel.setText(resourceMap.getString("appDescLabel.text")); // NOI18N
        appDescLabel.setName("appDescLabel"); // NOI18N

        javax.swing.ActionMap actionMap = org.jdesktop.application.Application.getInstance(biblioteka.BibliotekaApp.class).getContext().getActionMap(BibliotekaAboutBox.class, this);
        closeButton.setAction(actionMap.get("closeAboutBox")); // NOI18N
        closeButton.setText(resourceMap.getString("closeButton.text")); // NOI18N
        closeButton.setName("closeButton"); // NOI18N

        javax.swing.GroupLayout jPanel2Layout = new javax.swing.GroupLayout(jPanel2);
        jPanel2.setLayout(jPanel2Layout);
        jPanel2Layout.setHorizontalGroup(
            jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(jPanel2Layout.createSequentialGroup()
                .addGap(51, 51, 51)
                .addGroup(jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                        .addComponent(appTitleLabel)
                        .addComponent(appDescLabel, javax.swing.GroupLayout.DEFAULT_SIZE, 292, Short.MAX_VALUE)
                        .addGroup(jPanel2Layout.createSequentialGroup()
                            .addGroup(jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                                .addComponent(versionLabel)
                                .addComponent(vendorLabel))
                            .addGap(41, 41, 41)
                            .addGroup(jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                                .addComponent(appVersionLabel)
                                .addComponent(appVendorLabel))
                            .addGap(9, 9, 9)))
                    .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, jPanel2Layout.createSequentialGroup()
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 196, javax.swing.GroupLayout.PREFERRED_SIZE)
                        .addComponent(closeButton)
                        .addGap(29, 29, 29)))
                .addGap(105, 105, 105))
        );
        jPanel2Layout.setVerticalGroup(
            jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, jPanel2Layout.createSequentialGroup()
                .addGap(28, 28, 28)
                .addComponent(appTitleLabel)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 17, Short.MAX_VALUE)
                .addComponent(appDescLabel, javax.swing.GroupLayout.PREFERRED_SIZE, 28, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addGroup(jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(versionLabel)
                    .addComponent(appVersionLabel))
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addGroup(jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(vendorLabel)
                    .addComponent(appVendorLabel))
                .addGap(18, 18, 18)
                .addComponent(closeButton)
                .addGap(20, 20, 20))
        );

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addComponent(jPanel2, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addComponent(jPanel2, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
        );

        pack();
    }// </editor-fold>                        
    
    // Variables declaration - do not modify                     
    private javax.swing.JButton closeButton;
    private javax.swing.JPanel jPanel1;
    private javax.swing.JPanel jPanel2;
    // End of variables declaration                   
    
}

BibliotekaView.java

/*
* BibliotekaView.java
*/

package biblioteka;

import org.jdesktop.application.Action;
import org.jdesktop.application.ResourceMap;
import org.jdesktop.application.SingleFrameApplication;
import org.jdesktop.application.FrameView;
import org.jdesktop.application.TaskMonitor;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.Timer;
import javax.swing.Icon;
import javax.swing.JDialog;
import javax.swing.JFrame;

/**
* The application's main frame.
*/
public class BibliotekaView extends FrameView {

    public BibliotekaView(SingleFrameApplication app) {
        super(app);

        initComponents();

        // status bar initialization - message timeout, idle icon and busy animation, etc
        ResourceMap resourceMap = getResourceMap();
        int messageTimeout = resourceMap.getInteger("StatusBar.messageTimeout");
        messageTimer = new Timer(messageTimeout, new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                statusMessageLabel.setText("");
            }
        });
        messageTimer.setRepeats(false);
        int busyAnimationRate = resourceMap.getInteger("StatusBar.busyAnimationRate");
        for (int i = 0; i < busyIcons.length; i++) {
            busyIcons[i] = resourceMap.getIcon("StatusBar.busyIcons[" + i + "]");
        }
        busyIconTimer = new Timer(busyAnimationRate, new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                busyIconIndex = (busyIconIndex + 1) % busyIcons.length;
                statusAnimationLabel.setIcon(busyIcons[busyIconIndex]);
            }
        });
        idleIcon = resourceMap.getIcon("StatusBar.idleIcon");
        statusAnimationLabel.setIcon(idleIcon);


        // connecting action tasks to status bar via TaskMonitor
        TaskMonitor taskMonitor = new TaskMonitor(getApplication().getContext());
        taskMonitor.addPropertyChangeListener(new java.beans.PropertyChangeListener() {
            public void propertyChange(java.beans.PropertyChangeEvent evt) {
                String propertyName = evt.getPropertyName();
                if ("started".equals(propertyName)) {
                    if (!busyIconTimer.isRunning()) {
                        statusAnimationLabel.setIcon(busyIcons[0]);
                        busyIconIndex = 0;
                        busyIconTimer.start();
                    }
                   
                } else if ("done".equals(propertyName)) {
                    busyIconTimer.stop();
                    statusAnimationLabel.setIcon(idleIcon);
                    
                } else if ("message".equals(propertyName)) {
                    String text = (String)(evt.getNewValue());
                    statusMessageLabel.setText((text == null) ? "" : text);
                    messageTimer.restart();
                } else if ("progress".equals(propertyName)) {
                    int value = (Integer)(evt.getNewValue());
                }
            }
        });
    }

    @Action
    public void showAboutBox()
    {
        if (aboutBox == null)
        {
            JFrame mainFrame = BibliotekaApp.getApplication().getMainFrame();
            aboutBox = new BibliotekaAboutBox(mainFrame);
            aboutBox.setLocationRelativeTo(mainFrame);
        }
        BibliotekaApp.getApplication().show(aboutBox);
    }

    public void showDodajBook()
    {

        if (DodajBook == null)
        {
            JFrame mainFrame = BibliotekaApp.getApplication().getMainFrame();
            DodajBook = new Dodaj(mainFrame);
            DodajBook.setLocationRelativeTo(mainFrame);
        }
        BibliotekaApp.getApplication().show(DodajBook);
    }



    /** This method is called from within the constructor to
     * initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is
     * always regenerated by the Form Editor.
     */
    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">                          
    private void initComponents() {

        mainPanel = new javax.swing.JPanel();
        jButton1 = new javax.swing.JButton();
        jButton2 = new javax.swing.JButton();
        jButton3 = new javax.swing.JButton();
        menuBar = new javax.swing.JMenuBar();
        javax.swing.JMenu fileMenu = new javax.swing.JMenu();
        javax.swing.JMenuItem exitMenuItem = new javax.swing.JMenuItem();
        javax.swing.JMenu helpMenu = new javax.swing.JMenu();
        javax.swing.JMenuItem aboutMenuItem = new javax.swing.JMenuItem();
        statusPanel = new javax.swing.JPanel();
        javax.swing.JSeparator statusPanelSeparator = new javax.swing.JSeparator();
        statusMessageLabel = new javax.swing.JLabel();
        statusAnimationLabel = new javax.swing.JLabel();
        jLabel1 = new javax.swing.JLabel();
        jLabel2 = new javax.swing.JLabel();
        jLabel3 = new javax.swing.JLabel();
        jLabel4 = new javax.swing.JLabel();

        mainPanel.setName("mainPanel"); // NOI18N

        org.jdesktop.application.ResourceMap resourceMap = org.jdesktop.application.Application.getInstance(biblioteka.BibliotekaApp.class).getContext().getResourceMap(BibliotekaView.class);
        jButton1.setText(resourceMap.getString("jButton1.text")); // NOI18N
        jButton1.setName("jButton1"); // NOI18N
        jButton1.addMouseListener(new java.awt.event.MouseAdapter() {
            public void mouseClicked(java.awt.event.MouseEvent evt) {
                jButton1MouseClicked(evt);
            }
        });

        jButton2.setText(resourceMap.getString("jButton2.text")); // NOI18N
        jButton2.setName("jButton2"); // NOI18N

        jButton3.setText(resourceMap.getString("jButton3.text")); // NOI18N
        jButton3.setName("jButton3"); // NOI18N

        javax.swing.GroupLayout mainPanelLayout = new javax.swing.GroupLayout(mainPanel);
        mainPanel.setLayout(mainPanelLayout);
        mainPanelLayout.setHorizontalGroup(
            mainPanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(mainPanelLayout.createSequentialGroup()
                .addGap(42, 42, 42)
                .addComponent(jButton1)
                .addContainerGap(278, Short.MAX_VALUE))
            .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, mainPanelLayout.createSequentialGroup()
                .addContainerGap(274, Short.MAX_VALUE)
                .addComponent(jButton3)
                .addGap(24, 24, 24))
            .addGroup(mainPanelLayout.createSequentialGroup()
                .addGap(153, 153, 153)
                .addComponent(jButton2, javax.swing.GroupLayout.PREFERRED_SIZE, 102, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addContainerGap(162, Short.MAX_VALUE))
        );
        mainPanelLayout.setVerticalGroup(
            mainPanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(mainPanelLayout.createSequentialGroup()
                .addGap(60, 60, 60)
                .addComponent(jButton1)
                .addGap(33, 33, 33)
                .addComponent(jButton2)
                .addGap(33, 33, 33)
                .addComponent(jButton3)
                .addContainerGap(46, Short.MAX_VALUE))
        );

        menuBar.setName("menuBar"); // NOI18N

        fileMenu.setText(resourceMap.getString("fileMenu.text")); // NOI18N
        fileMenu.setName("fileMenu"); // NOI18N

        javax.swing.ActionMap actionMap = org.jdesktop.application.Application.getInstance(biblioteka.BibliotekaApp.class).getContext().getActionMap(BibliotekaView.class, this);
        exitMenuItem.setAction(actionMap.get("quit")); // NOI18N
        exitMenuItem.setText(resourceMap.getString("exitMenuItem.text")); // NOI18N
        exitMenuItem.setName("exitMenuItem"); // NOI18N
        fileMenu.add(exitMenuItem);

        menuBar.add(fileMenu);

        helpMenu.setText(resourceMap.getString("helpMenu.text")); // NOI18N
        helpMenu.setName("helpMenu"); // NOI18N

        aboutMenuItem.setAction(actionMap.get("showAboutBox")); // NOI18N
        aboutMenuItem.setText(resourceMap.getString("aboutMenuItem.text")); // NOI18N
        aboutMenuItem.setName("aboutMenuItem"); // NOI18N
        helpMenu.add(aboutMenuItem);

        menuBar.add(helpMenu);

        statusPanel.setName("statusPanel"); // NOI18N

        statusPanelSeparator.setName("statusPanelSeparator"); // NOI18N

        statusMessageLabel.setName("statusMessageLabel"); // NOI18N

        statusAnimationLabel.setHorizontalAlignment(javax.swing.SwingConstants.LEFT);
        statusAnimationLabel.setName("statusAnimationLabel"); // NOI18N

        jLabel1.setFont(resourceMap.getFont("jLabel1.font")); // NOI18N
        jLabel1.setText(resourceMap.getString("jLabel1.text")); // NOI18N
        jLabel1.setName("jLabel1"); // NOI18N

        jLabel2.setFont(resourceMap.getFont("jLabel2.font")); // NOI18N
        jLabel2.setText(resourceMap.getString("jLabel2.text")); // NOI18N
        jLabel2.setName("jLabel2"); // NOI18N

        jLabel3.setText(resourceMap.getString("jLabel3.text")); // NOI18N
        jLabel3.setName("jLabel3"); // NOI18N

        jLabel4.setFont(resourceMap.getFont("jLabel4.font")); // NOI18N
        jLabel4.setText(resourceMap.getString("jLabel4.text")); // NOI18N
        jLabel4.setName("jLabel4"); // NOI18N

        javax.swing.GroupLayout statusPanelLayout = new javax.swing.GroupLayout(statusPanel);
        statusPanel.setLayout(statusPanelLayout);
        statusPanelLayout.setHorizontalGroup(
            statusPanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(statusPanelLayout.createSequentialGroup()
                .addContainerGap()
                .addComponent(statusMessageLabel)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addComponent(jLabel1)
                .addGap(10, 10, 10)
                .addComponent(jLabel2)
                .addGap(37, 37, 37)
                .addComponent(jLabel3)
                .addGap(18, 18, 18)
                .addComponent(jLabel4)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 114, Short.MAX_VALUE)
                .addComponent(statusAnimationLabel)
                .addContainerGap())
            .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, statusPanelLayout.createSequentialGroup()
                .addGap(118, 118, 118)
                .addComponent(statusPanelSeparator, javax.swing.GroupLayout.DEFAULT_SIZE, 299, Short.MAX_VALUE))
        );
        statusPanelLayout.setVerticalGroup(
            statusPanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(statusPanelLayout.createSequentialGroup()
                .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                .addComponent(statusPanelSeparator, javax.swing.GroupLayout.PREFERRED_SIZE, 2, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
                .addGroup(statusPanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, statusPanelLayout.createSequentialGroup()
                        .addGroup(statusPanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                            .addComponent(statusMessageLabel)
                            .addComponent(statusAnimationLabel))
                        .addGap(3, 3, 3))
                    .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, statusPanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                        .addComponent(jLabel1)
                        .addComponent(jLabel2)
                        .addComponent(jLabel3)
                        .addComponent(jLabel4))))
        );

        setComponent(mainPanel);
        setMenuBar(menuBar);
        setStatusBar(statusPanel);
    }// </editor-fold>                        

    private void jButton1MouseClicked(java.awt.event.MouseEvent evt) {                                      
       showDodajBook();
    }                                     

    // Variables declaration - do not modify                     
    private javax.swing.JButton jButton1;
    private javax.swing.JButton jButton2;
    private javax.swing.JButton jButton3;
    private javax.swing.JLabel jLabel1;
    private javax.swing.JLabel jLabel2;
    private javax.swing.JLabel jLabel3;
    private javax.swing.JLabel jLabel4;
    private javax.swing.JPanel mainPanel;
    private javax.swing.JMenuBar menuBar;
    private javax.swing.JLabel statusAnimationLabel;
    private javax.swing.JLabel statusMessageLabel;
    private javax.swing.JPanel statusPanel;
    // End of variables declaration                   

    private final Timer messageTimer;
    private final Timer busyIconTimer;
    private final Icon idleIcon;
    private final Icon[] busyIcons = new Icon[15];
    private int busyIconIndex = 0;

    private JDialog aboutBox;
    private JDialog DodajBook;
}

dodaj.java

/*
* BibliotekaAboutBox.java
*/

package biblioteka;

import org.jdesktop.application.Action;



public class Dodaj extends javax.swing.JDialog {

    public Dodaj(java.awt.Frame parent) {
        super(parent);
        initComponents();
        getRootPane().setDefaultButton(jButton1);
    }

    @Action public void closeAboutBox() {
        dispose();
    }

    /** This method is called from within the constructor to
     * initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is
     * always regenerated by the Form Editor.
     */
    // <editor-fold defaultstate="collapsed" desc="Generated Code">                          
    private void initComponents() {

        jPanel1 = new javax.swing.JPanel();
        jLabel1 = new javax.swing.JLabel();
        jLabel2 = new javax.swing.JLabel();
        jLabel3 = new javax.swing.JLabel();
        jTextField1 = new javax.swing.JTextField();
        jTextField2 = new javax.swing.JTextField();
        jLabel4 = new javax.swing.JLabel();
        jLabel5 = new javax.swing.JLabel();
        jLabel6 = new javax.swing.JLabel();
        jTextField3 = new javax.swing.JTextField();
        jTextField4 = new javax.swing.JTextField();
        jLabel7 = new javax.swing.JLabel();
        jLabel8 = new javax.swing.JLabel();
        jLabel9 = new javax.swing.JLabel();
        jTextField5 = new javax.swing.JTextField();
        jTextField6 = new javax.swing.JTextField();
        jLabel10 = new javax.swing.JLabel();
        jLabel11 = new javax.swing.JLabel();
        jLabel12 = new javax.swing.JLabel();
        jLabel13 = new javax.swing.JLabel();
        jTextField7 = new javax.swing.JTextField();
        jTextField8 = new javax.swing.JTextField();
        jTextField9 = new javax.swing.JTextField();
        jLabel14 = new javax.swing.JLabel();
        jScrollPane1 = new javax.swing.JScrollPane();
        jTextArea1 = new javax.swing.JTextArea();
        jButton1 = new javax.swing.JButton();

        jPanel1.setName("jPanel1"); // NOI18N

        javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);
        jPanel1.setLayout(jPanel1Layout);
        jPanel1Layout.setHorizontalGroup(
            jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGap(0, 100, Short.MAX_VALUE)
        );
        jPanel1Layout.setVerticalGroup(
            jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGap(0, 100, Short.MAX_VALUE)
        );

        setDefaultCloseOperation(javax.swing.WindowConstants.DISPOSE_ON_CLOSE);
        org.jdesktop.application.ResourceMap resourceMap = org.jdesktop.application.Application.getInstance(biblioteka.BibliotekaApp.class).getContext().getResourceMap(Dodaj.class);
        setTitle(resourceMap.getString("title")); // NOI18N
        setBackground(resourceMap.getColor("aboutBox.background")); // NOI18N
        setIconImages(null);
        setModal(true);
        setName("aboutBox"); // NOI18N
        setResizable(false);

        jLabel1.setFont(resourceMap.getFont("jLabel1.font")); // NOI18N
        jLabel1.setText(resourceMap.getString("jLabel1.text")); // NOI18N
        jLabel1.setName("jLabel1"); // NOI18N

        jLabel2.setText(resourceMap.getString("jLabel2.text")); // NOI18N
        jLabel2.setName("jLabel2"); // NOI18N

        jLabel3.setText(resourceMap.getString("jLabel3.text")); // NOI18N
        jLabel3.setName("jLabel3"); // NOI18N

        jTextField1.setText(resourceMap.getString("jTextField1.text")); // NOI18N
        jTextField1.setName("jTextField1"); // NOI18N

        jTextField2.setText(resourceMap.getString("jTextField2.text")); // NOI18N
        jTextField2.setName("jTextField2"); // NOI18N

        jLabel4.setFont(resourceMap.getFont("jLabel4.font")); // NOI18N
        jLabel4.setText(resourceMap.getString("jLabel4.text")); // NOI18N
        jLabel4.setName("jLabel4"); // NOI18N

        jLabel5.setText(resourceMap.getString("jLabel5.text")); // NOI18N
        jLabel5.setName("jLabel5"); // NOI18N

        jLabel6.setText(resourceMap.getString("jLabel6.text")); // NOI18N
        jLabel6.setName("jLabel6"); // NOI18N

        jTextField3.setText(resourceMap.getString("jTextField3.text")); // NOI18N
        jTextField3.setName("jTextField3"); // NOI18N

        jTextField4.setText(resourceMap.getString("jTextField4.text")); // NOI18N
        jTextField4.setName("jTextField4"); // NOI18N

        jLabel7.setFont(resourceMap.getFont("jLabel7.font")); // NOI18N
        jLabel7.setText(resourceMap.getString("jLabel7.text")); // NOI18N
        jLabel7.setName("jLabel7"); // NOI18N

        jLabel8.setText(resourceMap.getString("jLabel8.text")); // NOI18N
        jLabel8.setName("jLabel8"); // NOI18N

        jLabel9.setText(resourceMap.getString("jLabel9.text")); // NOI18N
        jLabel9.setName("jLabel9"); // NOI18N

        jTextField5.setText(resourceMap.getString("jTextField5.text")); // NOI18N
        jTextField5.setName("jTextField5"); // NOI18N

        jTextField6.setText(resourceMap.getString("jTextField6.text")); // NOI18N
        jTextField6.setName("jTextField6"); // NOI18N

        jLabel10.setFont(resourceMap.getFont("jLabel10.font")); // NOI18N
        jLabel10.setText(resourceMap.getString("jLabel10.text")); // NOI18N
        jLabel10.setName("jLabel10"); // NOI18N

        jLabel11.setText(resourceMap.getString("jLabel11.text")); // NOI18N
        jLabel11.setName("jLabel11"); // NOI18N

        jLabel12.setText(resourceMap.getString("jLabel12.text")); // NOI18N
        jLabel12.setName("jLabel12"); // NOI18N

        jLabel13.setText(resourceMap.getString("jLabel13.text")); // NOI18N
        jLabel13.setName("jLabel13"); // NOI18N

        jTextField7.setText(resourceMap.getString("jTextField7.text")); // NOI18N
        jTextField7.setName("jTextField7"); // NOI18N

        jTextField8.setText(resourceMap.getString("jTextField8.text")); // NOI18N
        jTextField8.setName("jTextField8"); // NOI18N

        jTextField9.setText(resourceMap.getString("jTextField9.text")); // NOI18N
        jTextField9.setName("jTextField9"); // NOI18N

        jLabel14.setFont(resourceMap.getFont("jLabel14.font")); // NOI18N
        jLabel14.setText(resourceMap.getString("jLabel14.text")); // NOI18N
        jLabel14.setName("jLabel14"); // NOI18N

        jScrollPane1.setName("jScrollPane1"); // NOI18N

        jTextArea1.setColumns(20);
        jTextArea1.setFont(resourceMap.getFont("jTextArea1.font")); // NOI18N
        jTextArea1.setRows(5);
        jTextArea1.setName("jTextArea1"); // NOI18N
        jScrollPane1.setViewportView(jTextArea1);

        jButton1.setText(resourceMap.getString("jButton1.text")); // NOI18N
        jButton1.setName("jButton1"); // NOI18N
        jButton1.addMouseListener(new java.awt.event.MouseAdapter() {
            public void mouseClicked(java.awt.event.MouseEvent evt) {
                jButton1MouseClicked(evt);
            }
        });

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addGap(210, 210, 210)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addComponent(jLabel12)
                    .addComponent(jLabel11)
                    .addComponent(jLabel13))
                .addGap(69, 69, 69)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING, false)
                    .addComponent(jTextField8, javax.swing.GroupLayout.Alignment.LEADING)
                    .addComponent(jTextField7, javax.swing.GroupLayout.Alignment.LEADING, javax.swing.GroupLayout.DEFAULT_SIZE, 157, Short.MAX_VALUE)
                    .addComponent(jTextField9, javax.swing.GroupLayout.Alignment.LEADING))
                .addContainerGap(215, Short.MAX_VALUE))
            .addGroup(layout.createSequentialGroup()
                .addGap(344, 344, 344)
                .addComponent(jLabel14)
                .addContainerGap(269, Short.MAX_VALUE))
            .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                .addContainerGap(353, Short.MAX_VALUE)
                .addComponent(jButton1)
                .addGap(307, 307, 307))
            .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
                    .addGroup(layout.createSequentialGroup()
                        .addContainerGap()
                        .addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 671, javax.swing.GroupLayout.PREFERRED_SIZE))
                    .addGroup(layout.createSequentialGroup()
                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                            .addGroup(layout.createSequentialGroup()
                                .addGap(34, 34, 34)
                                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                                    .addComponent(jLabel2)
                                    .addComponent(jLabel3))
                                .addGap(65, 65, 65)
                                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
                                    .addComponent(jTextField2)
                                    .addComponent(jTextField1, javax.swing.GroupLayout.DEFAULT_SIZE, 91, Short.MAX_VALUE))
                                .addGap(46, 46, 46)
                                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                                    .addGroup(layout.createSequentialGroup()
                                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                                            .addComponent(jLabel5)
                                            .addComponent(jLabel6))
                                        .addGap(70, 70, 70)
                                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
                                            .addComponent(jTextField4)
                                            .addComponent(jTextField3, javax.swing.GroupLayout.DEFAULT_SIZE, 82, Short.MAX_VALUE)))
                                    .addComponent(jLabel10))
                                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED))
                            .addGroup(layout.createSequentialGroup()
                                .addGap(90, 90, 90)
                                .addComponent(jLabel1)
                                .addGap(216, 216, 216)
                                .addComponent(jLabel4)))
                        .addGap(30, 30, 30)
                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                            .addGroup(layout.createSequentialGroup()
                                .addGap(37, 37, 37)
                                .addComponent(jLabel7)
                                .addGap(134, 134, 134))
                            .addGroup(layout.createSequentialGroup()
                                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                                    .addComponent(jLabel8)
                                    .addComponent(jLabel9))
                                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 15, Short.MAX_VALUE)
                                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
                                    .addComponent(jTextField6)
                                    .addComponent(jTextField5, javax.swing.GroupLayout.PREFERRED_SIZE, 112, javax.swing.GroupLayout.PREFERRED_SIZE))))))
                .addGap(25, 25, 25))
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addGap(21, 21, 21)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addGroup(layout.createSequentialGroup()
                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                            .addComponent(jLabel1)
                            .addComponent(jLabel4))
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                            .addComponent(jLabel2)
                            .addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                            .addComponent(jLabel5)
                            .addComponent(jTextField3, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                            .addComponent(jLabel3)
                            .addComponent(jTextField2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                            .addComponent(jLabel6)
                            .addComponent(jTextField4, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)))
                    .addGroup(layout.createSequentialGroup()
                        .addComponent(jLabel7)
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                            .addComponent(jLabel8)
                            .addComponent(jTextField5, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                            .addComponent(jLabel9)
                            .addComponent(jTextField6, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))))
                .addGap(51, 51, 51)
                .addComponent(jLabel10)
                .addGap(18, 18, 18)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(jLabel11)
                    .addComponent(jTextField7, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(jLabel12)
                    .addComponent(jTextField8, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(jLabel13)
                    .addComponent(jTextField9, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addGap(18, 18, 18)
                .addComponent(jLabel14)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 76, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addComponent(jButton1)
                .addContainerGap(14, Short.MAX_VALUE))
        );

        pack();
    }// </editor-fold>                        

    private void jButton1MouseClicked(java.awt.event.MouseEvent evt) {                                      
       
        BibliotekaApp.ksiazki[BibliotekaApp.iksiazki][0]=jTextField1.getText();
        BibliotekaApp.ksiazki[BibliotekaApp.iksiazki][0]=jTextField2.getText();
        BibliotekaApp.ksiazki[BibliotekaApp.iksiazki][0]=jTextField3.getText();
        BibliotekaApp.ksiazki[BibliotekaApp.iksiazki][0]=jTextField4.getText();
        BibliotekaApp.ksiazki[BibliotekaApp.iksiazki][0]=jTextField5.getText();
        BibliotekaApp.ksiazki[BibliotekaApp.iksiazki][0]=jTextField6.getText();
        BibliotekaApp.ksiazki[BibliotekaApp.iksiazki][0]=jTextField7.getText();
        BibliotekaApp.ksiazki[BibliotekaApp.iksiazki][0]=jTextField8.getText();
        BibliotekaApp.ksiazki[BibliotekaApp.iksiazki][0]=jTextField9.getText();
        BibliotekaApp.ksiazki[BibliotekaApp.iksiazki][0]=jTextArea1.getText();

        BibliotekaApp.zapis();//jak wywalę tą linijkę, to błędów nie ma, ale nie o to przecież chodzi.

        //closeAboutBox();

    }                                     
    
    // Variables declaration - do not modify                     
    private javax.swing.JButton jButton1;
    private javax.swing.JLabel jLabel1;
    private javax.swing.JLabel jLabel10;
    private javax.swing.JLabel jLabel11;
    private javax.swing.JLabel jLabel12;
    private javax.swing.JLabel jLabel13;
    private javax.swing.JLabel jLabel14;
    private javax.swing.JLabel jLabel2;
    private javax.swing.JLabel jLabel3;
    private javax.swing.JLabel jLabel4;
    private javax.swing.JLabel jLabel5;
    private javax.swing.JLabel jLabel6;
    private javax.swing.JLabel jLabel7;
    private javax.swing.JLabel jLabel8;
    private javax.swing.JLabel jLabel9;
    private javax.swing.JPanel jPanel1;
    private javax.swing.JScrollPane jScrollPane1;
    private javax.swing.JTextArea jTextArea1;
    private javax.swing.JTextField jTextField1;
    private javax.swing.JTextField jTextField2;
    private javax.swing.JTextField jTextField3;
    private javax.swing.JTextField jTextField4;
    private javax.swing.JTextField jTextField5;
    private javax.swing.JTextField jTextField6;
    private javax.swing.JTextField jTextField7;
    private javax.swing.JTextField jTextField8;
    private javax.swing.JTextField jTextField9;
    // End of variables declaration                   
    
}

<b>BibliotekaApp.java</b>

/*
* BibliotekaApp.java
*/

package biblioteka;

import org.jdesktop.application.Application;
import org.jdesktop.application.SingleFrameApplication;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.FileWriter;

/**
* The main class of the application.
*/
public class BibliotekaApp extends SingleFrameApplication {

    /**
     * At startup create and show the main frame of the application.
     */
    
    public static String[][] ksiazki=new String[1000000][11];
    public static String[][] uczniowie=new String[1000000][5];
    public static int iksiazki, iuczniowie=1;
    
    static FileWriter fw=null;
    static FileWriter fw1=null;

    public static void zapis()
    {
        try
        {
            fw=new FileWriter("plik.txt");
            fw1=new FileWriter("plik1.txt");

        }
        catch(IOException e)
        {
            e.printStackTrace();
        }
        BufferedWriter writer=new BufferedWriter(fw);
        BufferedWriter writer1=new BufferedWriter(fw1);
        try
        {
             for (int i = 0; i < iksiazki; i++)
             {
                 writer.write("=============================");
                 writer.newLine();
                 for (int j=0;j<ksiazki[i].length;j++)
                 {
                    switch (j)
                    {
                        case 0:
                            writer.write("Imie: ");
                            writer.newLine();
                            break;
                        case 1:
                            writer.write("Nazwisko: ");
                            writer.newLine();
                            break;
                        case 2:
                            writer.write("Tytół: ");

                            writer.newLine();
                            break;
                        case 3:
                            writer.write("Podtytół: ");
                            writer.newLine();
                            break;
                        case 4:
                            writer.write("ISBN: ");
                            writer.newLine();
                            break;
                        case 5:
                            writer.write("Numer biblioteczny: ");
                            writer.newLine();
                            break;
                        case 6:
                            writer.write("Nazwa wydawnictwa: ");
                            writer.newLine();
                            break;
                        case 7:
                            writer.write("Data wydania: ");
                            writer.newLine();
                            break;
                        case 8:
                            writer.write("Miejsce wydania: ");
                            writer.newLine();
                            break;
                        case 9:
                            writer.write("Informacje dodatkowe: ");
                            writer.newLine();
                            break;
                        case 10:
                            writer.write("Wypożyczył: ");
                            writer.newLine();
                            break;
                    }
                    writer.write(ksiazki[i][j]);
                    writer.newLine();
                 }
             }
             for (int i = 0; i < iuczniowie; i++)
             {
                 for (int j=0;j<uczniowie[i].length;j++)
                 {
                    writer1.write(uczniowie[i][j]);
                    writer1.newLine();
                 }
             }
        }
        catch (IOException e)
        {
             e.printStackTrace();
        }
        try
        {
            writer.close();
            fw.close();
        }
        catch (IOException e)
        {
           e.printStackTrace();
        }
    }
    
    
    @Override protected void startup() {
        show(new BibliotekaView(this));
    }

    /**
     * This method is to initialize the specified window by injecting resources.
     * Windows shown in our application come fully initialized from the GUI
     * builder, so this additional configuration is not needed.
     */
    @Override protected void configureWindow(java.awt.Window root) {
    }

    /**
     * A convenient static getter for the application instance.
     * @return the instance of BibliotekaApp
     */
    public static BibliotekaApp getApplication() {
        return Application.getInstance(BibliotekaApp.class);
    }

    /**
     * Main method launching the application.
     */
    public static void main(String[] args) {
        launch(BibliotekaApp.class, args);
    }
}

Kiedy wywołuję funkcję zapis, wywala błędy:

Exception occurred during event dispatching:
java.lang.NullPointerException
        at java.io.Writer.write(Writer.java:140)
        at biblioteka.BibliotekaApp.zapis(BibliotekaApp.java:107)
        at biblioteka.Dodaj.jButton1MouseClicked(Dodaj.java:314)
        at biblioteka.Dodaj.access$000(Dodaj.java:11)
        at biblioteka.Dodaj$1.mouseClicked(Dodaj.java:167)
        at java.awt.AWTEventMulticaster.mouseClicked(AWTEventMulticaster.java:253)
        at java.awt.Component.processMouseEvent(Component.java:6291)
        at javax.swing.JComponent.processMouseEvent(JComponent.java:3267)
        at java.awt.Component.processEvent(Component.java:6053)
        at java.awt.Container.processEvent(Container.java:2041)
        at java.awt.Component.dispatchEventImpl(Component.java:4651)
        at java.awt.Container.dispatchEventImpl(Container.java:2099)
        at java.awt.Component.dispatchEvent(Component.java:4481)
        at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4577)
        at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4247)
        at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4168)
        at java.awt.Container.dispatchEventImpl(Container.java:2085)
        at java.awt.Window.dispatchEventImpl(Window.java:2478)
        at java.awt.Component.dispatchEvent(Component.java:4481)
        at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:643)
        at java.awt.EventQueue.access$000(EventQueue.java:84)
        at java.awt.EventQueue$1.run(EventQueue.java:602)
        at java.awt.EventQueue$1.run(EventQueue.java:600)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87)
        at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:98)
        at java.awt.EventQueue$2.run(EventQueue.java:616)
        at java.awt.EventQueue$2.run(EventQueue.java:614)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:613)
        at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
        at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
        at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:178)
        at java.awt.Dialog$1.run(Dialog.java:1046)
        at java.awt.Dialog$3.run(Dialog.java:1098)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.awt.Dialog.show(Dialog.java:1096)
        at java.awt.Component.show(Component.java:1584)
        at java.awt.Component.setVisible(Component.java:1536)
        at java.awt.Window.setVisible(Window.java:842)
        at java.awt.Dialog.setVisible(Dialog.java:986)
        at org.jdesktop.application.SingleFrameApplication.show(SingleFrameApplication.java:296)
        at biblioteka.BibliotekaView.showDodajBook(BibliotekaView.java:100)
        at biblioteka.BibliotekaView.jButton1MouseClicked(BibliotekaView.java:272)
        at biblioteka.BibliotekaView.access$700(BibliotekaView.java:22)
        at biblioteka.BibliotekaView$4.mouseClicked(BibliotekaView.java:139)
        at java.awt.AWTEventMulticaster.mouseClicked(AWTEventMulticaster.java:253)
        at java.awt.Component.processMouseEvent(Component.java:6291)
        at javax.swing.JComponent.processMouseEvent(JComponent.java:3267)
        at java.awt.Component.processEvent(Component.java:6053)
        at java.awt.Container.processEvent(Container.java:2041)
        at java.awt.Component.dispatchEventImpl(Component.java:4651)
        at java.awt.Container.dispatchEventImpl(Container.java:2099)
        at java.awt.Component.dispatchEvent(Component.java:4481)
        at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4577)
        at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4247)
        at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4168)
        at java.awt.Container.dispatchEventImpl(Container.java:2085)
        at java.awt.Window.dispatchEventImpl(Window.java:2478)
        at java.awt.Component.dispatchEvent(Component.java:4481)
        at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:643)
        at java.awt.EventQueue.access$000(EventQueue.java:84)
        at java.awt.EventQueue$1.run(EventQueue.java:602)
        at java.awt.EventQueue$1.run(EventQueue.java:600)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87)
        at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:98)
        at java.awt.EventQueue$2.run(EventQueue.java:616)
        at java.awt.EventQueue$2.run(EventQueue.java:614)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:613)
        at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
        at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)
        at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)

Bardzo to dziwne, gdyż w tym samym miejscu wywoływałem funkcję write, tworzyłem obiekty fileWriter itd i nie było problemu. Jak to naprawić?

E: I dlaczego występują te błędy? Jak unikać ich w przyszłości.

E2: Pliki się tworzą, ale puste.

R.o.b · 5 Lipca 2011

Trochę dużo tego kodu. Zacznijmy od początku, czy zrobiłeś plik z bazą. Nie jestem zaawansowanymprogramistą w Javie, ale wydaje mi się, że bazy danych nie da się zapisać FileWriterem. Napisz ten problem na 4programmers, ja z problemami zgłaszam się tam, bo na tym forum jest mało javowców

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