7117595: ArrayIndexOutOfBoundsException in Win32GraphicsEnvironment if display is removed

Reviewed-by: anthony, serb

src/macosx/classes/sun/awt/CGraphicsEnvironment.java

@@ -181,6 +181,9 @@ public final class CGraphicsEnvironment extends SunGraphicsEnvironment {
             initDevices();
 
             d = devices.get(mainDisplayID);
+            if (d == null) {
+                throw new AWTError("no screen devices");
+            }
         }
         return d;
     }

src/share/classes/sun/java2d/SunGraphicsEnvironment.java

@@ -165,7 +165,11 @@ public abstract class SunGraphicsEnvironment extends GraphicsEnvironment
      * Returns the default screen graphics device.
      */
     public GraphicsDevice getDefaultScreenDevice() {
-        return getScreenDevices()[0];
+        GraphicsDevice[] screens = getScreenDevices();
+        if (screens.length == 0) {
+            throw new AWTError("no screen devices");
+        }
+        return screens[0];
     }
 
     /**

src/solaris/classes/sun/awt/X11GraphicsEnvironment.java

@@ -200,7 +200,12 @@ public class X11GraphicsEnvironment
      * Returns the default screen graphics device.
      */
     public GraphicsDevice getDefaultScreenDevice() {
-        return getScreenDevices()[getDefaultScreenNum()];
+        GraphicsDevice[] screens = getScreenDevices();
+        if (screens.length == 0) {
+            throw new AWTError("no screen devices");
+        }
+        int index = getDefaultScreenNum();
+        return screens[0 < index && index < screens.length ? index : 0];
     }
 
     public boolean isDisplayLocal() {

src/windows/classes/sun/awt/Win32GraphicsEnvironment.java

@@ -93,7 +93,12 @@ public class Win32GraphicsEnvironment
     protected native int getDefaultScreen();
 
     public GraphicsDevice getDefaultScreenDevice() {
-        return getScreenDevices()[getDefaultScreen()];
+        GraphicsDevice[] screens = getScreenDevices();
+        if (screens.length == 0) {
+            throw new AWTError("no screen devices");
+        }
+        int index = getDefaultScreen();
+        return screens[0 < index && index < screens.length ? index : 0];
     }
 
     /**