Estou tentando fazer um pequeno editor de texto que carrega um arquivo e para isso tava tentando utilizar o WindowsFileChooser mas estou tendo esse erro:
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at com.sun.java.swing.plaf.windows.WindowsFileChooserUI.installComponents(WindowsFileChooserUI.java:305)
at javax.swing.plaf.basic.BasicFileChooserUI.installUI(BasicFileChooserUI.java:173)
at com.sun.java.swing.plaf.windows.WindowsFileChooserUI.installUI(WindowsFileChooserUI.java:149)
at controller.Janela.actionPerformed(Janela.java:46)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2022)
at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2348)
at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402)
at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:252)
at java.awt.Component.processMouseEvent(Component.java:6533)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3324)
at java.awt.Component.processEvent(Component.java:6298)
at java.awt.Container.processEvent(Container.java:2236)
at java.awt.Component.dispatchEventImpl(Component.java:4889)
at java.awt.Container.dispatchEventImpl(Container.java:2294)
at java.awt.Component.dispatchEvent(Component.java:4711)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4888)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4525)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4466)
at java.awt.Container.dispatchEventImpl(Container.java:2280)
at java.awt.Window.dispatchEventImpl(Window.java:2746)
at java.awt.Component.dispatchEvent(Component.java:4711)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:758)
at java.awt.EventQueue.access$500(EventQueue.java:97)
at java.awt.EventQueue$3.run(EventQueue.java:709)
at java.awt.EventQueue$3.run(EventQueue.java:703)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:86)
at java.awt.EventQueue$4.run(EventQueue.java:731)
at java.awt.EventQueue$4.run(EventQueue.java:729)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:728)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)
Aqui esta o meu código completo:
[code]package controller;
import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.Font;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.File;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import com.sun.java.swing.plaf.windows.WindowsFileChooserUI;
import javax.swing.JButton;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
public class Janela extends JFrame implements ActionListener{
JTextArea texto;
public Janela() {
super(“Editor de Texto”);
texto = new JTextArea();
JScrollPane scroll = new JScrollPane(texto);
texto.setFont(new Font(“Serif”, Font.PLAIN, 26));
JButton botao = new JButton("Abrir arquivo");
botao.setFont(new Font("Serif", Font.PLAIN, 26));
botao.addActionListener(this);
Container c = getContentPane();
c.add(BorderLayout.CENTER,scroll);
c.add(BorderLayout.SOUTH, botao);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setSize(500, 300);
setVisible(true);
}
public static void main(String[] args) {
new Janela();
}
@Override
public void actionPerformed(ActionEvent e) {
JFileChooser c = new JFileChooser();
WindowsFileChooserUI wui = new WindowsFileChooserUI(c);
wui.installUI(c);
c.showOpenDialog(this);
File file = c.getSelectedFile();
try{
Path path = Paths.get(file.getAbsolutePath());
String retorno = new String(Files.readAllBytes(path));
texto.setText(retorno);
}catch(Exception erro){
JOptionPane.showMessageDialog(this, "Erro ao abrir arquivo");
}
}
}
[/code]