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Dans mon application quand j'appuyez sur Modifier dans mon JMenuBar je reçoisJMenu pressé throws Exception
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at sun.swing.SwingUtilities2.getLeftSideBearing(SwingUtilities2.java:241)
at sun.swing.MenuItemLayoutHelper.getLeftExtraWidth(MenuItemLayoutHelper.java:162)
at sun.swing.MenuItemLayoutHelper.calcExtraWidths(MenuItemLayoutHelper.java:158)
at sun.swing.MenuItemLayoutHelper.reset(MenuItemLayoutHelper.java:148)
at sun.swing.MenuItemLayoutHelper.(MenuItemLayoutHelper.java:107)
at javax.swing.plaf.basic.BasicMenuItemUI.getPreferredMenuItemSize(BasicMenuItemUI.java:408)
at javax.swing.plaf.basic.BasicMenuItemUI.getPreferredSize(BasicMenuItemUI.java:363)
at javax.swing.JComponent.getPreferredSize(JComponent.java:1634)
at javax.swing.BoxLayout.checkRequests(BoxLayout.java:481)
at javax.swing.BoxLayout.preferredLayoutSize(BoxLayout.java:298)
at javax.swing.plaf.basic.DefaultMenuLayout.preferredLayoutSize(DefaultMenuLayout.java:60)
at java.awt.Container.preferredSize(Container.java:1605)
at java.awt.Container.getPreferredSize(Container.java:1590)
at javax.swing.JComponent.getPreferredSize(JComponent.java:1636)
at javax.swing.JMenu.getPopupMenuOrigin(JMenu.java:383)
at javax.swing.JMenu.setPopupMenuVisible(JMenu.java:349)
at javax.swing.JPopupMenu.menuSelectionChanged(JPopupMenu.java:1433)
at javax.swing.MenuSelectionManager.setSelectedPath(MenuSelectionManager.java:117)
at javax.swing.plaf.basic.BasicMenuUI.appendPath(BasicMenuUI.java:223)
at javax.swing.plaf.basic.BasicMenuUI.access$200(BasicMenuUI.java:49)
at javax.swing.plaf.basic.BasicMenuUI$Handler.mousePressed(BasicMenuUI.java:463)
at java.awt.Component.processMouseEvent(Component.java:6265)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3267)
at java.awt.Component.processEvent(Component.java:6033)
at java.awt.Container.processEvent(Container.java:2045)
at java.awt.Component.dispatchEventImpl(Component.java:4629)
at java.awt.Container.dispatchEventImpl(Container.java:2103)
at java.awt.Component.dispatchEvent(Component.java:4455)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4633)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4294)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4227)
at java.awt.Container.dispatchEventImpl(Container.java:2089)
at java.awt.Window.dispatchEventImpl(Window.java:2517)
at java.awt.Component.dispatchEvent(Component.java:4455)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:649)
at java.awt.EventQueue.access$000(EventQueue.java:96)
at java.awt.EventQueue$1.run(EventQueue.java:608)
at java.awt.EventQueue$1.run(EventQueue.java:606)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:105)
at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:116)
at java.awt.EventQueue$2.run(EventQueue.java:622)
at java.awt.EventQueue$2.run(EventQueue.java:620)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:105)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:619)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:275)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:200)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:190)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:185)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:177)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:138)
Je ne peux pas savoir ce qui ne va pas avec mon application. Voici le code:
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.event.*;
import javax.swing.undo.*;
public class Jaba extends JFrame {
public Jaba() {
super("Hello Swing");
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setSize(640, 480);
setLayout(new FlowLayout());
txt.getDocument().addUndoableEditListener(undoListener);
add(txt);
setJMenuBar(menuBar);
menuBar.add(editMenu);
editMenu.add(undoAction);
editMenu.add(redoAction);
}
public static void main(String args[]) {
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
new Jaba().setVisible(true);
}
});
}
private UndoableEditListener undoListener = new UndoableEditListener() {
@Override
public void undoableEditHappened(UndoableEditEvent e) {
undo.addEdit(e.getEdit());
}
};
private AbstractAction undoAction = new AbstractAction() {
@Override
public void actionPerformed(ActionEvent e) {
try {
undo.undo();
} catch (CannotUndoException ex) {
System.err.println("Cannon undo");
ex.printStackTrace();
}
}
};
private AbstractAction redoAction = new AbstractAction() {
@Override
public void actionPerformed(ActionEvent e) {
try {
undo.redo();
} catch (CannotUndoException ex) {
System.err.println("Cannon undo");
ex.printStackTrace();
}
}
};
private UndoManager undo = new UndoManager();
private JTextArea txt = new JTextArea(40, 40);
private JMenuBar menuBar = new JMenuBar();
private JMenu editMenu = new JMenu("Edit");
}
Quelle est la stacktrace? –
J'ai posté la trace. – OneMoreVladimir
Put damn ... Ajout de "Redo" arg au constructeur AbstractAction résolu que shit =). Merci beaucoup mec! – OneMoreVladimir