--- /dev/null	2016-10-25 08:46:44.038854975 +0200
+++ new/src/share/classes/sun/evtracing/processing/statistics/metadata/JavaObjectStack.java	2016-10-25 10:41:00.665811616 +0200
@@ -0,0 +1,61 @@
+/*
+ * Copyright (c) 2014, 2015, Dynatrace and/or its affiliates. All rights reserved.
+ * 
+ * This file is part of the Lock Contention Tracing Subsystem for the HotSpot
+ * Virtual Machine, which is developed at Christian Doppler Laboratory on
+ * Monitoring and Evolution of Very-Large-Scale Software Systems. Please
+ * contact us at <http://mevss.jku.at/> if you need additional information
+ * or have any questions.
+ *
+ * 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, see <http://www.gnu.org/licenses/>.
+ *
+ */ 
+package sun.evtracing.processing.statistics.metadata;
+
+import java.util.Arrays;
+
+public abstract class JavaObjectStack {
+
+	public static final JavaObjectStack HIDDEN = new JavaObjectArrayStack(0) {
+		@Override
+		public boolean equals(Object obj) {
+			return (this == obj);
+		}
+	};
+
+	public abstract JavaObject top();
+
+	public abstract JavaObject[] objects();
+
+	public abstract void setObject(int number, JavaObject obj);
+
+	public abstract JavaClassStack getClassStack();
+
+	@Override
+	public int hashCode() {
+		return Arrays.hashCode(objects());
+	}
+
+	@Override
+	public boolean equals(Object obj) {
+		if (this == obj) {
+			return true;
+		}
+		if (obj instanceof JavaObjectStack) {
+			JavaObjectStack other = (JavaObjectStack) obj;
+			return Arrays.equals(objects(), other.objects());
+		}
+		return false;
+	}
+}