Index: src/main/java/common/javax/swing/JComponent.java =================================================================== --- src/main/java/common/javax/swing/JComponent.java (revision 490924) +++ src/main/java/common/javax/swing/JComponent.java (working copy) @@ -1004,6 +1004,10 @@ } public void paintImmediately(Rectangle rect) { + if (rect == null) { + throw new NullPointerException(); + } + if (!isShowing()) { return; }