Name: ooR10001 Date: 03/28/2001


javax.swing.JWindow(GraphicsConfiguration conf) constructor incorrectly throws
IllegalArgumentException when passed GraphicsConfiguration is from ScreenDevice
and GraphicsEnvironment.isHeadless() returns false. This behavior contradicts
with current javadoc which says:

-----------------------
public JWindow(GraphicsConfiguration gc)

      Creates a window with the specified GraphicsConfiguration of a screen
      device. This window will not be focusable.
      Parameters:
            gc - the GraphicsConfiguration that is used to construct the new
            window with; if gc is null, the system default GraphicsConfiguration
            is assumed
      Throws:
            IllegalArgumentException - if gc is not from a screen device. This
            exception is always thrown when GraphicsEnvironment.isHeadless()
            returns true
-----------------------

This is a test sample which shows the bug:
--------------
import java.awt.GraphicsEnvironment;
import java.awt.GraphicsDevice;
import java.awt.GraphicsConfiguration;
import javax.swing.JWindow;

public class t {

  public static void main(String[] args) {
      GraphicsEnvironment ge =
          GraphicsEnvironment.getLocalGraphicsEnvironment();
      GraphicsDevice[] gs = ge.getScreenDevices();
      GraphicsConfiguration[] cs = gs[0].getConfigurations();
      try {
          JWindow w = new JWindow(cs[0]);
      } catch (IllegalArgumentException iae) {
          if (GraphicsEnvironment.isHeadless()) {
              System.out.println("Correctly thrown IAE in headless mode");
          } else {
              System.out.println("Unexpected IAE thrown");
          }
      }
  }

}
--------------

Output:
--------------
Unexpected IAE thrown
--------------

It needs to be fixed.
Proposal fix is to not use call 'this((Frame)null, gc);' in this constructor.
It causes the check that owned window should not be null.
More correctly is to use 'super(gc); windowInit();' calls instead. This calling
sequence is not requred not-null owned window.
               
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