--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/jdk/com/sun/jdi/ConstantPoolInfoGC.java	Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,104 @@
+/*
+ * Copyright (c) 2016, 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.
+ */
+
+/*
+ * @test
+ * @bug 6822627
+ * @summary Test that ReferenceType.constantPool does not produce an NPE
+ * @author Egor Ushakov
+ *
+ * @modules jdk.jdi/com.sun.tools.jdi:+open
+ *
+ * @run build TestScaffold VMConnection
+ * @run compile -g ConstantPoolInfoGC.java
+ * @run main/othervm ConstantPoolInfoGC
+ */
+
+import com.sun.jdi.ReferenceType;
+import com.sun.tools.jdi.ReferenceTypeImpl;
+
+import java.lang.ref.Reference;
+import java.lang.reflect.Field;
+import java.util.Arrays;
+
+    /********** target program **********/
+
+class ConstantPoolGCTarg {
+    public static void main(String[] args){
+        System.out.println("Anything");
+    }
+}
+
+    /********** test program **********/
+
+public class ConstantPoolInfoGC extends TestScaffold {
+    ReferenceType targetClass;
+
+    ConstantPoolInfoGC(String args[]) {
+        super(args);
+    }
+
+    public static void main(String[] args)      throws Exception {
+        new ConstantPoolInfoGC(args).startTests();
+    }
+
+    /********** test core **********/
+
+    protected void runTests() throws Exception {
+        targetClass = startToMain("ConstantPoolGCTarg").location().declaringType();
+
+        if (vm().canGetConstantPool()) {
+            byte[] cpbytes = targetClass.constantPool();
+
+            // imitate SoftReference cleared
+            Field constantPoolBytesRef = ReferenceTypeImpl.class.getDeclaredField("constantPoolBytesRef");
+            constantPoolBytesRef.setAccessible(true);
+            Reference softRef = (Reference) constantPoolBytesRef.get(targetClass);
+            softRef.clear();
+
+            byte[] cpbytes2 = targetClass.constantPool();
+            if (!Arrays.equals(cpbytes, cpbytes2)) {
+                failure("Consequent constantPool results vary, first was : " + cpbytes + ", now: " + cpbytes2);
+            };
+
+        } else {
+            System.out.println("can get constant pool version not supported");
+        }
+
+
+        /*
+         * resume until end
+         */
+        listenUntilVMDisconnect();
+
+        /*
+         * deal with results of test
+         * if anything has called failure("foo") testFailed will be true
+         */
+        if (!testFailed) {
+            println("ConstantPoolInfoGC: passed");
+        } else {
+            throw new Exception("ConstantPoolInfoGC: failed");
+        }
+    }
+}