diff -r fd16c54261b3 -r 90ce3da70b43 jdk/test/com/sun/jdi/SDENullTest.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/test/com/sun/jdi/SDENullTest.java	Sat Dec 01 00:00:00 2007 +0000
@@ -0,0 +1,82 @@
+/*
+ * Copyright 2002 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 4621289
+ *  @summary vm.setDefaultStratum(null) causes a Null Ptr exception
+ *
+ *  @author jjh
+ *
+ *  @run build  TestScaffold VMConnection TargetListener TargetAdapter
+ *  @run compile -g SDENullTest.java
+ *  @run main SDENullTest
+ */
+import com.sun.jdi.*;
+import com.sun.jdi.event.*;
+import com.sun.jdi.request.*;
+
+import java.util.*;
+
+    /********** target program **********/
+
+class SDENullTarg {
+    public static void main(String[] args){
+        System.out.println("Howdy!");
+        System.out.println("Goodbye from SDENullTarg!");
+    }
+}
+
+    /********** test program **********/
+
+public class SDENullTest extends TestScaffold {
+    ReferenceType targetClass;
+    ThreadReference mainThread;
+
+    SDENullTest (String args[]) {
+        super(args);
+    }
+
+    public static void main(String[] args)      throws Exception {
+        new SDENullTest(args).startTests();
+    }
+
+    /********** test core **********/
+
+    protected void runTests() throws Exception {
+        /*
+         * Get to the top of main()
+         * to determine targetClass and mainThread
+         */
+        BreakpointEvent bpe = startToMain("SDENullTarg");
+        targetClass = bpe.location().declaringType();
+        mainThread = bpe.thread();
+        EventRequestManager erm = vm().eventRequestManager();
+        vm().setDefaultStratum(null);
+        if (!testFailed) {
+            println("SDENullTest: passed");
+        } else {
+            throw new Exception("SDENullTest: failed");
+        }
+    }
+}