merlimat opened a new issue #1241: NullPointerException in 
PerChannelBookieClient
URL: https://github.com/apache/bookkeeper/issues/1241
 
 
   I have seen this error in `PerChannelBookieClient` with the latest master 
code:
   
   ```
   18:36:28.989 [bookkeeper-io-5-1] WARN  
io.netty.util.concurrent.DefaultPromise - An exception was thrown by 
org.apache.bookkeeper.proto.PerChannelBookieClient$3.operationComplete()
   java.lang.NullPointerException: null
        at 
org.apache.bookkeeper.proto.PerChannelBookieClient$3.operationComplete(PerChannelBookieClient.java:885)
 
~[org.apache.bookkeeper-bookkeeper-server-shaded-4.7.0-20180309.150140-65.jar:4.7.0-SNAPSHOT]
        at 
org.apache.bookkeeper.proto.PerChannelBookieClient$3.operationComplete(PerChannelBookieClient.java:879)
 
~[org.apache.bookkeeper-bookkeeper-server-shaded-4.7.0-20180309.150140-65.jar:4.7.0-SNAPSHOT]
        at 
io.netty.util.concurrent.DefaultPromise.notifyListener0(DefaultPromise.java:512)
 [io.netty-netty-all-4.1.21.Final.jar:4.1.21.Final]
        at 
io.netty.util.concurrent.DefaultPromise.notifyListenersNow(DefaultPromise.java:486)
 [io.netty-netty-all-4.1.21.Final.jar:4.1.21.Final]
        at 
io.netty.util.concurrent.DefaultPromise.access$000(DefaultPromise.java:34) 
[io.netty-netty-all-4.1.21.Final.jar:4.1.21.Final]
        at 
io.netty.util.concurrent.DefaultPromise$1.run(DefaultPromise.java:436) 
[io.netty-netty-all-4.1.21.Final.jar:4.1.21.Final]
        at 
io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:163)
 [io.netty-netty-all-4.1.21.Final.jar:4.1.21.Final]
        at 
io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:404)
 [io.netty-netty-all-4.1.21.Final.jar:4.1.21.Final]
        at io.netty.channel.epoll.EpollEventLoop.run(EpollEventLoop.java:309) 
[io.netty-netty-all-4.1.21.Final.jar:4.1.21.Final]
        at 
io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:886)
 [io.netty-netty-all-4.1.21.Final.jar:4.1.21.Final]
        at 
io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
 [io.netty-netty-all-4.1.21.Final.jar:4.1.21.Final]
        at java.lang.Thread.run(Thread.java:748) [?:1.8.0_161]
   ```

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