Github user hanm commented on a diff in the pull request:
https://github.com/apache/zookeeper/pull/590#discussion_r219659171
--- Diff: src/java/main/org/apache/zookeeper/server/DumbWatcher.java ---
@@ -0,0 +1,101 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.zookeeper.server;
+
+import java.io.IOException;
+import java.net.InetSocketAddress;
+import java.nio.ByteBuffer;
+import java.security.cert.Certificate;
+
+import org.apache.jute.Record;
+import org.apache.zookeeper.Watcher;
+import org.apache.zookeeper.WatchedEvent;
+import org.apache.zookeeper.proto.ReplyHeader;
+import org.apache.zookeeper.server.ServerCnxn;
+import org.apache.zookeeper.server.ServerStats;
+
+/**
+ * A empthy watcher implementation used in bench and unit test.
--- End diff --
spelling: `empty`
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