--- /dev/null	2018-05-14 10:15:02.574213890 -0700
+++ new/test/hotspot/jtreg/vmTestbase/vm/runtime/defmeth/shared/data/ConcreteClassLazyAdapter.java	2018-05-21 10:53:15.449502567 -0700
@@ -0,0 +1,69 @@
+/*
+ * Copyright (c) 2013, 2018, 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.
+ */
+
+package vm.runtime.defmeth.shared.data;
+
+import vm.runtime.defmeth.shared.builder.TestBuilder;
+
+/**
+ * Wrapper around some ConcreteClass instance. It delegates all calls to
+ * underlying instance. Lazy resolution of a target instance by it's name
+ * allows to delay resolution till runtime and "tie-the-knot" in recursive
+ * hierarchies.
+ */
+public class ConcreteClassLazyAdapter extends ClazzLazyAdapter implements ConcreteClass {
+    private final TestBuilder builder;
+    private final String name;
+
+    private ConcreteClass target;
+
+    public ConcreteClassLazyAdapter(TestBuilder builder, String name) {
+        super(builder, name);
+
+        this.builder = builder;
+        this.name = name;
+    }
+
+    private ConcreteClass delegate() {
+        if (target == null) {
+            target = (ConcreteClass)builder.lookup(name);
+        }
+
+        return target;
+    }
+
+    @Override
+    public ConcreteClass parent() {
+        return delegate().parent();
+    }
+
+    @Override
+    public Interface[] interfaces() {
+        return delegate().interfaces();
+    }
+
+    @Override
+    public void visit(Visitor v) {
+        delegate().visit(v);
+    }
+}