6875716: JLayer.remove((Component)null) should behave consistently in (not) throwing NPE

Reviewed-by: rupashka

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

@@ -333,7 +333,9 @@ public final class JLayer<V extends Component>
      * {@inheritDoc}
      */
     public void remove(Component comp) {
-        if (comp == getView()) {
+        if (comp == null) {
+            super.remove(comp);
+        } else if (comp == getView()) {
             setView(null);
         } else if (comp == getGlassPane()) {
             setGlassPane(null);

test/javax/swing/JLayer/6875716/bug6875716.java

+/*
+ * Copyright 2009 Sun Microsystems, Inc.  All Rights Reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ */
+
+/* @test
+ * @bug 6875716
+ * @summary JLayer.remove((Component)null) should behave consistently in (not) throwing NPE
+ * @author Alexander Potochkin
+ */
+
+import javax.swing.*;
+import java.awt.*;
+
+public class bug6875716 {
+
+    public static void main(String[] args) throws Exception {
+        JLayer<Component> layer = new JLayer<Component>(new Component(){});
+        layer.setGlassPane(null);
+        try {
+            layer.remove((Component)null);
+        } catch (NullPointerException e) {
+            //this is what we expect
+            return;
+        }
+        throw new RuntimeException("Test failed");
+    }
+}