--- old/src/share/classes/javax/swing/JComponent.java	2014-07-21 13:11:52.000000000 +0400
+++ new/src/share/classes/javax/swing/JComponent.java	2014-07-21 13:11:52.000000000 +0400
@@ -62,6 +62,7 @@
 import javax.swing.plaf.*;
 import static javax.swing.ClientPropertyKey.*;
 import javax.accessibility.*;
+import sun.awt.AppContext;
 
 import sun.awt.SunToolkit;
 import sun.swing.SwingUtilities2;
@@ -4834,8 +4835,11 @@
      * @see RepaintManager#addDirtyRegion
      */
     public void repaint(long tm, int x, int y, int width, int height) {
-        RepaintManager.currentManager(SunToolkit.targetToAppContext(this))
-                      .addDirtyRegion(this, x, y, width, height);
+        AppContext appContext = SunToolkit.targetToAppContext(this);
+        if (appContext != null) {
+            RepaintManager.currentManager(appContext)
+                    .addDirtyRegion(this, x, y, width, height);
+        }
     }