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POJFileChooser fails
 

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    <p>In my code at a certain point i have this code</p> <pre><code>void selectRoot() { JFileChooser ch = new JFileChooser(); ch.showOpenDialog((JFrame)this); } </code></pre> <p>This throws that Exception:</p> <pre><code>Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException at java.io.Win32FileSystem.normalize(Win32FileSystem.java:164) at java.io.Win32FileSystem.getUserPath(Win32FileSystem.java:296) at java.io.Win32FileSystem.resolve(Win32FileSystem.java:312) at java.io.File.getAbsolutePath(File.java:501) at sun.awt.shell.Win32ShellFolder2.&lt;init&gt;(Win32ShellFolder2.java:291) at sun.awt.shell.Win32ShellFolderManager2.createShellFolderFromRelativePIDL(Win32ShellFolderManager2.java:66) at sun.awt.shell.Win32ShellFolderManager2.createShellFolder(Win32ShellFolderManager2.java:56) at sun.awt.shell.Win32ShellFolderManager2.getRecent(Win32ShellFolderManager2.java:114) at sun.awt.shell.Win32ShellFolderManager2.get(Win32ShellFolderManager2.java:251) at sun.awt.shell.ShellFolder.get(ShellFolder.java:227) at sun.swing.WindowsPlacesBar.&lt;init&gt;(WindowsPlacesBar.java:64) at com.sun.java.swing.plaf.windows.WindowsFileChooserUI.updateUseShellFolder(WindowsFileChooserUI.java:505) at com.sun.java.swing.plaf.windows.WindowsFileChooserUI.installComponents(WindowsFileChooserUI.java:196) at javax.swing.plaf.basic.BasicFileChooserUI.installUI(BasicFileChooserUI.java:136) at com.sun.java.swing.plaf.windows.WindowsFileChooserUI.installUI(WindowsFileChooserUI.java:129) at javax.swing.JComponent.setUI(JComponent.java:673) at javax.swing.JFileChooser.updateUI(JFileChooser.java:1763) at javax.swing.JFileChooser.setup(JFileChooser.java:360) at javax.swing.JFileChooser.&lt;init&gt;(JFileChooser.java:333) at javax.swing.JFileChooser.&lt;init&gt;(JFileChooser.java:286) at my.pack.Main.selectRoot(Main.java:184) </code></pre> <p>Looking in the source of java.io.Win32FileSystem.normalize() it seems the (current) path is null:</p> <pre><code> public String normalize(String path) { int n = path.length(); // Line: 164 char slash = this.slash; char altSlash = this.altSlash; </code></pre> <p>If i run selectRoot() from another point in the program it runs fine ...</p> <p><strong>Update</strong></p> <p>Guys that is really a good one for the great book of programing pitfalls !</p> <p>In my original code there is a JTextField that holds the actual path and get initialize that way:</p> <pre><code>root = new JTextField(); root.setToolTipText("Root folder"); root.setText(System.clearProperty("user.dir")); </code></pre> <p>System.clearProperty() clears the system property (to null) <strong>and</strong> returns the old value (arrrghhhhhhh). clearProperty() probably slipped in from auto-completion.</p> <p>Thank you all. Will give some up votes to you ...</p>
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    1. COWhat does "this" in your code reference?
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    2. COthis is a JFrame that graps an ActionEvent from a JButton to pop-up the JFleChooser.
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    3. COWhen do you call this code? It seems like initialization code, do you really want to open the file chooser at startup?
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