src/share/classes/javax/swing/JViewport.java

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@@ -1584,14 +1584,22 @@
         //   clip* are in the views coordinate space.
         RepaintManager rm = RepaintManager.currentManager(this);
         int bdx = blitToX - blitFromX;
         int bdy = blitToY - blitFromY;
 
+        Composite oldComposite = null;
         // Shift the scrolled region
+        if (g instanceof Graphics2D) {
+            Graphics2D g2d = (Graphics2D) g;
+            oldComposite = g2d.getComposite();
+            g2d.setComposite(AlphaComposite.Src);
+        }
         rm.copyArea(this, g, blitFromX, blitFromY, blitW, blitH, bdx, bdy,
                     false);
-
+        if (oldComposite != null) {
+            ((Graphics2D) g).setComposite(oldComposite);
+        }
         // Paint the newly exposed region.
         int x = view.getX();
         int y = view.getY();
         g.translate(x, y);
         g.setClip(clipX, clipY, clipW, clipH);