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  1. JDK
  2. JDK-6616245

NullPointerException when using JFileChooser with a custom FileView

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    • b19
    • x86
    • windows_xp

    Description

      FULL PRODUCT VERSION :
      JDK 1.5.0_10

      ADDITIONAL OS VERSION INFORMATION :
      WinXP 5.1.2600, Solaris 5.10

      A DESCRIPTION OF THE PROBLEM :
      When setting a JFileChooser to an instance of a FileView subclass that restricts traversing outside of a specified directory tree, and I use the pulldown list to select a directory outside of the tree, and then do it again to select a directory inside the tree, a NullPointerException is thrown from inside JFileChooser.

      A toy program and stack trace are included below wbjch demonstrate this (with the path changed for Solaris).

      STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
      Execute the toy program below on Windows (make sure C:\temp exists) - in the JFileChooser, use the pulldown list to choose the C:\ drive or some other directory; then, use the pulldown again to choose C:\temp. Verify the NullPointerException at the console.


      ERROR MESSAGES/STACK TRACES THAT OCCUR :
      Exception occurred during event dispatching:
      java.lang.NullPointerException
      at javax.swing.plaf.metal.MetalFileChooserUI$DirectoryComboBoxAction.actionPerformed(Unknown Source)
      at javax.swing.JComboBox.fireActionEvent(Unknown Source)
      at javax.swing.JComboBox.setSelectedItem(Unknown Source)
      at javax.swing.JComboBox.setSelectedIndex(Unknown Source)
      at javax.swing.plaf.basic.BasicComboPopup$Handler.mouseReleased(Unknown Source)
      at java.awt.AWTEventMulticaster.mouseReleased(Unknown Source)
      at java.awt.Component.processMouseEvent(Unknown Source)
      at javax.swing.JComponent.processMouseEvent(Unknown Source)
      at javax.swing.plaf.basic.BasicComboPopup$1.processMouseEvent(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.LightweightDispatcher.retargetMouseEvent(Unknown Source)
      at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
      at java.awt.LightweightDispatcher.dispatchEvent(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.dispatchEvent(Unknown Source)
      at java.awt.EventDispatchThread.pumpOneEventForHierarchy(Unknown Source)
      at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
      at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
      at java.awt.Dialog$1.run(Unknown Source)
      at java.awt.Dialog$2.run(Unknown Source)
      at java.security.AccessController.doPrivileged(Native Method)
      at java.awt.Dialog.show(Unknown Source)
      at javax.swing.JFileChooser.showDialog(Unknown Source)
      at javax.swing.JFileChooser.showOpenDialog(Unknown Source)
      at FileChooserTest$1.actionPerformed(FileChooserTest.java:28)
      at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
      at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
      at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
      at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
      at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source)
      at java.awt.Component.processMouseEvent(Unknown Source)
      at javax.swing.JComponent.processMouseEvent(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.LightweightDispatcher.retargetMouseEvent(Unknown Source)
      at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
      at java.awt.LightweightDispatcher.dispatchEvent(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.dispatchEvent(Unknown Source)
      at java.awt.EventDispatchThread.pumpOneEventForHierarchy(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)

      REPRODUCIBILITY :
      This bug can be reproduced always.

      ---------- BEGIN SOURCE ----------
      import java.awt.BorderLayout;
      import java.awt.event.*;
      import java.io.File;
      import javax.swing.*;
      import javax.swing.filechooser.FileView;
       
      public class FileChooserTest extends JFrame {
       
         private JButton button = null;
       
         public static void main(String [] args) {
            FileChooserTest application = new FileChooserTest();
            application.setVisible(true);
         }
       
         public FileChooserTest() {
            this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            this.setSize(200, 200);
            
            button = new JButton("Show Chooser");
            button.addActionListener(new ActionListener() {
               public void actionPerformed(ActionEvent e) {
                  JFileChooser openChooser = new JFileChooser();
                  String path = "C:" + File.separator + "temp";
                  openChooser.setCurrentDirectory(new File(path));
                  openChooser.setFileView(new MyFileView(path));
                  
                  int result = openChooser.showOpenDialog(FileChooserTest.this);
                  
                  if (result == JFileChooser.APPROVE_OPTION)
                     System.out.println(openChooser.getSelectedFile().getAbsolutePath());
                  else
                     System.out.println("cancelled");
               }
            });
            
            getContentPane().setLayout(new BorderLayout());
            getContentPane().add(button, BorderLayout.CENTER);
         }
      }
       
      class MyFileView extends FileView {
         private String basePath;
         
         public MyFileView(String path) {
            basePath = path;
         }
         
         public Boolean isTraversable(File f) {
            if ((f != null) && (f.isDirectory()))
               return f.getAbsolutePath().startsWith(basePath);
            else
               return false;
         }
      }
      ---------- END SOURCE ----------

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              tr Tejesh R
              rupashka Pavel Porvatov (Inactive)
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                Updated:
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