8015336: BasicComboBoxEditor throws NullPointerException

Reviewed-by: alexsch

src/share/classes/javax/swing/plaf/basic/BasicComboBoxEditor.java

@@ -73,6 +73,9 @@ public class BasicComboBoxEditor implements ComboBoxEditor,FocusListener {
 
         if ( anObject != null )  {
             text = anObject.toString();
+            if (text == null) {
+                text = "";
+            }
             oldValue = anObject;
         } else {
             text = "";

test/javax/swing/plaf/basic/BasicComboBoxEditor/Test8015336.java

+/*
+ * Copyright (c) 2013, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+import javax.swing.JComboBox;
+
+/*
+ * @test
+ * @bug 8015336
+ * @summary No NPE for BasicComboBoxEditor.setItem(null)
+ * @author Sergey Malenkov
+ */
+public class Test8015336 {
+    public static void main(String[] args) throws Exception {
+        new JComboBox().getEditor().setItem(new Test8015336());
+    }
+
+    @Override
+    public String toString() {
+        return null;
+    }
+}