--- old/src/java.desktop/share/classes/java/awt/Taskbar.java	2017-03-15 16:38:53.000000000 +0300
+++ new/src/java.desktop/share/classes/java/awt/Taskbar.java	2017-03-15 16:38:52.000000000 +0300
@@ -274,6 +274,8 @@
     /**
      * Requests user attention to the specified window.
      *
+     * Has no effect if this window is not visible in the task area.
+     *
      * @param w window
      * @throws SecurityException if a security manager exists and it denies the
      * {@code RuntimePermission("canProcessApplicationEvents")} permission.
@@ -375,6 +377,8 @@
      * for the specified window.
      * It may be disabled by system settings.
      *
+     * Has no effect if this window is not visible in the task area.
+     *
      * @param w window to update
      * @param badge image to affix to the icon
      * @throws SecurityException if a security manager exists and it denies the
@@ -409,6 +413,8 @@
     /**
      * Displays a determinate progress bar in the task area for the specified
      * window.
+     *
+     * Has no effect if this window is not visible in the task area.
      * <br>
      * The visual behavior is platform and {@link State} dependent.
      * <br>
@@ -437,6 +443,8 @@
 
     /**
      * Sets a progress state for a specified window.
+     *
+     * Has no effect if this window is not visible in the task area.
      * <br>
      * Each state displays a progress in a platform-dependent way.
      * <br>