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  1. JDK
  2. JDK-6508168

NullPointerException while updateUI() in MouseListener of JTable header.

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      FULL PRODUCT VERSION :
      java version "1.6.0"
      Java(TM) SE Runtime Environment (build 1.6.0-b105)
      Java HotSpot(TM) Client VM (build 1.6.0-b105, mixed mode, sharing)

      ADDITIONAL OS VERSION INFORMATION :
      Microsoft Windows XP [Version 5.1.2600]

      A DESCRIPTION OF THE PROBLEM :
      NullPointerException when executing JTable header updateUI() from MouseListener of this header.

      STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
      1. javac Test.java
      2. java Test
      3. Click on table header by left mouse button two times.

      EXPECTED VERSUS ACTUAL BEHAVIOR :
      EXPECTED -
      nothing
      ACTUAL -
      NullPointerException

      ERROR MESSAGES/STACK TRACES THAT OCCUR :
      Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
      at javax.swing.plaf.basic.BasicTableHeaderUI$MouseInputHandler.mouseClicked(Unknown Source)
      at java.awt.AWTEventMulticaster.mouseClicked(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.pumpOneEventForFilters(Unknown Source)
      at java.awt.EventDispatchThread.pumpEventsForFilter(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.event.MouseAdapter;
      import java.awt.event.MouseEvent;
      import javax.swing.JFrame;
      import javax.swing.JScrollPane;
      import javax.swing.JTable;
      import javax.swing.table.DefaultTableModel;
      import javax.swing.table.TableModel;

      public class TestTable {
      public static void main(String[] args) {
      TableModel tm = new DefaultTableModel(3, 3);
      final JTable table = new JTable(tm);
      table.getTableHeader().addMouseListener(new MouseAdapter() {
      public void mouseClicked(MouseEvent event) {
      table.getTableHeader().updateUI();
      }
      });
      JScrollPane pan = new JScrollPane(table);
      JFrame fr = new JFrame();
      fr.getContentPane().add(pan);
      fr.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      fr.setSize(300, 200);
      fr.setVisible(true);
      }
      }
      ---------- END SOURCE ----------

      CUSTOMER SUBMITTED WORKAROUND :
      Use repaint() instead of updateUI().

            shickeysunw Shannon Hickey (Inactive)
            igor Igor Nekrestyanov (Inactive)
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              Created:
              Updated:
              Resolved:
              Imported:
              Indexed: