--- /dev/null	2016-10-25 08:46:44.038854975 +0200
+++ new/src/share/classes/sun/evtracing/processing/statistics/aggregator/LeafAggregator.java	2016-10-25 10:40:56.819809068 +0200
@@ -0,0 +1,59 @@
+/*
+ * 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.aggregator;
+
+import java.util.Collections;
+import java.util.Map;
+
+import sun.evtracing.processing.statistics.metadata.Contention;
+
+public class LeafAggregator extends Aggregator {
+	LeafAggregator(LeafAggregatorFactory factory) {
+		super(factory);
+	}
+
+	LeafAggregator(LeafAggregator x, LeafAggregator y) {
+		super(x, y);
+	}
+
+	@Override
+	public void submitToChildren(Contention c) {
+		// nothing to do
+	}
+
+	@Override
+	public void merge() {
+		// nothing to do
+	}
+
+	@Override
+	public Map<?, Aggregator> children() {
+		return Collections.emptyMap();
+	}
+
+	@Override
+	public <R> R accept(AggregatorVisitor<R> v, Object element) {
+		throw new UnsupportedOperationException("leaf aggregators do not have children");
+	}
+}