Github user hanm commented on a diff in the pull request: https://github.com/apache/zookeeper/pull/99#discussion_r90960756 --- Diff: src/java/main/org/apache/zookeeper/server/NettyServerCnxn.java --- @@ -71,7 +71,7 @@ NettyServerCnxnFactory factory; boolean initialized; - NettyServerCnxn(Channel channel, ZooKeeperServer zks, NettyServerCnxnFactory factory) { + public NettyServerCnxn(Channel channel, ZooKeeperServer zks, NettyServerCnxnFactory factory) { --- End diff -- >> It is not the case, they don't fall back to NIO - they fail. The fallback I was referring to is https://github.com/apache/zookeeper/blob/master/src/java/main/org/apache/zookeeper/server/ServerCnxnFactory.java#L130. It gets hit when public was removed from NIOServerCnxn for Netty* tests. An example call stack (note that a Netty test complaining about NIOServerCnxnFactory): ` INFO [main:ZKTestCase$1@70] - FAILED testNettyRunTimeException java.io.IOException: Couldn't instantiate org.apache.zookeeper.server.NIOServerCnxnFactory >-------at org.apache.zookeeper.server.ServerCnxnFactory.createFactory(ServerCnxnFactory.java:142) >-------at org.apache.zookeeper.server.ServerCnxnFactory.createFactory(ServerCnxnFactory.java:158) >-------at org.apache.zookeeper.server.ServerCnxnFactory.createFactory(ServerCnxnFactory.java:152)` Thanks for persisting on this, but I don't think this erroneous case need to be investigated further as it would not happen when real test cases were running.
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