Resetting content type for multiple editor panes yields NPE

Under v0.9.5 on Windows 7, the following code causes a NullPointerException:

public static void main(String[] pArgs) {
  DefaultSyntaxKit.initKit();

  final JEditorPane[] editorPanes = new JEditorPane[2];

  for (int i = 0; i < editorPanes.length; i++) {
    editorPanes[i] = new JEditorPane();
  }

  final JFrame frame = new JFrame(
    TrialPanel.class.getName() + " Test"
  );
  frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

  frame.add(
    new JSplitPane(
      JSplitPane.VERTICAL_SPLIT,
      new JScrollPane(editorPanes[0]),
      new JScrollPane(editorPanes[1])
    )
  );
  frame.add(
    new JButton(
      new AbstractAction("Reset Content Type") {
        private String[] types = new String[] {
          "text/java", "text/javascript"
        };
        private int i;

        @Override public void actionPerformed(ActionEvent pEvt) {
          final String type = types[i++ % types.length];
          System.out.println("Type: " + type);
          for (JEditorPane editorPane : editorPanes) {
            editorPane.setContentType(type);
          }
        }
      }
    ),
    BorderLayout.SOUTH
  );

  frame.pack();
  frame.setVisible(true);
}
------
Press the button a few times and the following stacktrace is generated:

Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
    at jsyntaxpane.DefaultSyntaxKit.deinstall(DefaultSyntaxKit.java:345)
    at javax.swing.JEditorPane.setEditorKit(JEditorPane.java:1091)
    at javax.swing.JEditorPane.setContentType(JEditorPane.java:1019)
    at Test$1.actionPerformed(Test.java:49)
    at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1995)
    at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2318)
    at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:387)
    at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:242)
    at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:236)
    at java.awt.Component.processMouseEvent(Component.java:6289)
    at javax.swing.JComponent.processMouseEvent(JComponent.java:3267)
    at java.awt.Component.processEvent(Component.java:6054)
    at java.awt.Container.processEvent(Container.java:2041)
    at java.awt.Component.dispatchEventImpl(Component.java:4652)
    at java.awt.Container.dispatchEventImpl(Container.java:2099)
    at java.awt.Component.dispatchEvent(Component.java:4482)
    at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4577)
    at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4238)
    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:4482)
    at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:644)
    at java.awt.EventQueue.access$000(EventQueue.java:85)
    at java.awt.EventQueue$1.run(EventQueue.java:603)
    at java.awt.EventQueue$1.run(EventQueue.java:601)
    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:617)
    at java.awt.EventQueue$2.run(EventQueue.java:615)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87)
    at java.awt.EventQueue.dispatchEvent(EventQueue.java:614)
    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)
Original issue reported on code.google.com by holliswa...@gmail.com on 15 Mar 2011 at 5:21
zuoym / jsyntaxpane

Resetting content type for multiple editor panes yields NPE #172
