FULL PRODUCT VERSION :
java version "1.7.0-ea"
Java(TM) SE Runtime Environment (build 1.7.0-ea-b107)
Java HotSpot(TM) Client VM (build 19.0-b05, mixed mode)

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

A DESCRIPTION OF THE PROBLEM :
On Windows XP, the getBorder() method on javax.swing.border.TitledBorder returns null.

This is a regression - with java 6u21 and 1.7.0-ea-b36 it returns non-null.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Run the attached BorderTest sample.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
Proper repainting, no exceptions.
ACTUAL -
Painting aborted with NullPointerException:

Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
        at MyBorder.paintBorder(MyBorder.java:17)
        at javax.swing.JComponent.paintBorder(Unknown Source)
        at javax.swing.JComponent.paint(Unknown Source)
        at javax.swing.JComponent.paintChildren(Unknown Source)
        at javax.swing.JComponent.paint(Unknown Source)
        at javax.swing.JComponent.paintChildren(Unknown Source)
        at javax.swing.JComponent.paint(Unknown Source)
        at javax.swing.JLayeredPane.paint(Unknown Source)
        at javax.swing.JComponent.paintChildren(Unknown Source)
        at javax.swing.JComponent.paintToOffscreen(Unknown Source)
        at javax.swing.BufferStrategyPaintManager.paint(Unknown Source)
        at javax.swing.RepaintManager.paint(Unknown Source)
        at javax.swing.JComponent.paint(Unknown Source)
        at java.awt.GraphicsCallback$PaintCallback.run(Unknown Source)
        at sun.awt.SunGraphicsCallback.runOneComponent(Unknown Source)
        at sun.awt.SunGraphicsCallback.runComponents(Unknown Source)
        at java.awt.Container.paint(Unknown Source)
        at java.awt.Window.paint(Unknown Source)
        at javax.swing.RepaintManager.paintDirtyRegions(Unknown Source)
        at javax.swing.RepaintManager.paintDirtyRegions(Unknown Source)
        at javax.swing.RepaintManager.prePaintDirtyRegions(Unknown Source)
        at javax.swing.RepaintManager.access$700(Unknown Source)
        at javax.swing.RepaintManager$ProcessingRunnable.run(Unknown Source)
        at java.awt.event.InvocationEvent.dispatch(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.Component;
import java.awt.Graphics;

import javax.swing.border.TitledBorder;

public class MyBorder extends TitledBorder
{
   public MyBorder( String title )
   {
      super( title );
   }

   public void paintBorder( Component c, Graphics g, int x, int y, int width, int height )
   {
      if ( getTitle() == null || getTitle().length() == 0 )
      {
         getBorder().paintBorder( c, g, EDGE_SPACING, EDGE_SPACING, width - 2 * EDGE_SPACING, height - 2 * EDGE_SPACING );
      }
      else
      {
         super.paintBorder( c, g, x, y, width, height );
      }
   }
}


import java.awt.FlowLayout;

import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.UIManager;

public class BorderTest
{
   public static void main( String[] args )
   {
      try
      {
         UIManager.setLookAndFeel( UIManager.getSystemLookAndFeelClassName() );
      }
      catch ( Exception e )
      {
         e.printStackTrace();
      }

      JFrame frame = new JFrame();
      frame.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
      frame.getContentPane().setLayout( new FlowLayout() );
      
      JLabel label1 = new JLabel( "Component with titled border" );
      label1.setBorder( new MyBorder( "title" ) );
      frame.getContentPane().add( label1 );
      
      JLabel label2 = new JLabel( "Component with titled border - empty title" );
      label2.setBorder( new MyBorder( "" ) );
      frame.getContentPane().add( label2 );
      
      frame.pack();
      frame.setVisible( true );
   }
}

---------- END SOURCE ----------