8282548: Create a regression test for JDK-4330998

Backport-of: b451273d209d9dfce3d7c4464defe0df523dfc7c

test/jdk/javax/swing/JEditorPane/4330998/JEditorPaneSetTextNullTest.java

@@ -0,0 +1,45 @@
+ /*
+  * Copyright (c) 2013, 2022, 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.JEditorPane;
+ import javax.swing.SwingUtilities;
+
+ /*
+  * @test
+  * @bug 4330998
+  * @summary Verifies that JEditorPane.setText(null) doesn't throw NullPointerException.
+  * @run main JEditorPaneSetTextNullTest
+  */
+ public class JEditorPaneSetTextNullTest {
+
+     public static void main(String[] args) throws Exception {
+         try {
+             SwingUtilities.invokeAndWait(() -> new JEditorPane().setText(null));
+             System.out.println("Test passed");
+         } catch (Exception e) {
+             throw new RuntimeException("Test failed, caught Exception " + e
+                     + " when calling JEditorPane.setText(null)");
+         }
+     }
+
+ }