src/share/classes/sun/awt/dnd/SunDragSourceContextPeer.java

@@ -276,11 +276,11 @@
 
     /**
      * upcall from native code
      */
 
-    private void dragEnter(final int targetActions,
+    protected void dragEnter(final int targetActions,
                            final int modifiers,
                            final int x, final int y) {
         postDragSourceDragEvent(targetActions, modifiers, x, y, DISPATCH_ENTER);
     }
 

@@ -354,14 +354,10 @@
         dragImageOffset = null;
     }
 
     public static void setDragDropInProgress(boolean b)
       throws InvalidDnDOperationException {
-        if (dragDropInProgress == b) {
-            throw new InvalidDnDOperationException(getExceptionMessage(b));
-        }
-
         synchronized (SunDragSourceContextPeer.class) {
             if (dragDropInProgress == b) {
                 throw new InvalidDnDOperationException(getExceptionMessage(b));
             }
             dragDropInProgress = b;