--- old/src/share/classes/java/awt/Component.java	2009-09-25 17:41:05.000000000 +0400
+++ new/src/share/classes/java/awt/Component.java	2009-09-25 17:41:05.000000000 +0400
@@ -2761,8 +2761,11 @@
     }
 
     /**
-     * Ensures that this component has a valid layout.  This method is
-     * primarily intended to operate on instances of <code>Container</code>.
+     * Validates this component.
+     * <p>
+     * The meaning of the term <i>validating</i> is defined by the ancestors of
+     * this class. See {@link Container#validate} for more details.
+     *
      * @see       #invalidate
      * @see       #doLayout()
      * @see       LayoutManager
@@ -2791,12 +2794,23 @@
     }
 
     /**
-     * Invalidates this component.  This component and all parents
-     * above it are marked as needing to be laid out.  This method can
-     * be called often, so it needs to execute quickly.
+     * Invalidates this component and its ancestors.
+     * <p>
+     * All ancestors of this component up to the nearest validate root (or up
+     * to the root of the hierarchy if there's no a validate root container
+     * present) are marked invalid also.  Marking a container <i>invalid</i>
+     * indicates that the container needs to be laid out.
+     * <p>
+     * This method is called automatically when any layout-related information
+     * changes (e.g. setting the bounds of the component, or adding the
+     * component to a container).
+     * <p>
+     * This method can be called often, so it should work fast.
+     *
      * @see       #validate
      * @see       #doLayout
      * @see       LayoutManager
+     * @see       java.awt.Container#isValidateRoot
      * @since     JDK1.0
      */
     public void invalidate() {
@@ -2815,9 +2829,18 @@
             if (!isMaximumSizeSet()) {
                 maxSize = null;
             }
-            if (parent != null) {
-                parent.invalidateIfValid();
-            }
+            invalidateParent();
+        }
+    }
+
+    /**
+     * Invalidates the parent of this component if any.
+     *
+     * This method MUST BE invoked under the TreeLock.
+     */
+    void invalidateParent() {
+        if (parent != null) {
+            parent.invalidateIfValid();
         }
     }