[
https://issues.apache.org/jira/browse/ZOOKEEPER-3988?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17284683#comment-17284683
]
Devarshi Shah edited comment on ZOOKEEPER-3988 at 2/15/21, 12:05 PM:
---------------------------------------------------------------------
Hi,
While upgrading K8S cluster, container running zookeeper (during serving it's
client) will rollover one by one.
During this rollover, Null Pointer Exception was observed as below.
After updating to the latest ZK 3.6.2 we still see the problem.
This is happening on a fresh install (and has all the time):
<from zk-pod-0-log:
{code:java}
2021-02-08T12:42:08.229+0000 [myid:] - ERROR
[nioEventLoopGroup-4-1:NettyServerCnxnFactory$CnxnChannelHandler@329] -
Unexpected exception in receive
java.lang.NullPointerException: null
at
org.apache.zookeeper.server.NettyServerCnxn.receiveMessage(NettyServerCnxn.java:518)
~[zookeeper-3.6.2.jar:3.6.2]
at
org.apache.zookeeper.server.NettyServerCnxn.processMessage(NettyServerCnxn.java:368)
~[zookeeper-3.6.2.jar:3.6.2]
at
org.apache.zookeeper.server.NettyServerCnxnFactory$CnxnChannelHandler.channelRead(NettyServerCnxnFactory.java:326)
[zookeeper-3.6.2.jar:3.6.2]
at
io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379)
[netty-transport-4.1.50.Final.jar:4.1.50.Final]
at
io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365)
[netty-transport-4.1.50.Final.jar:4.1.50.Final]
at
io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357)
[netty-transport-4.1.50.Final.jar:4.1.50.Final]
at
io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1410)
[netty-transport-4.1.50.Final.jar:4.1.50.Final]
at
io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379)
[netty-transport-4.1.50.Final.jar:4.1.50.Final]
at
io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365)
[netty-transport-4.1.50.Final.jar:4.1.50.Final]
at
io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:919)
[netty-transport-4.1.50.Final.jar:4.1.50.Final]
at
io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:163)
[netty-transport-4.1.50.Final.jar:4.1.50.Final]
at
io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:714)
[netty-transport-4.1.50.Final.jar:4.1.50.Final]
at
io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:650)
[netty-transport-4.1.50.Final.jar:4.1.50.Final]
at
io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:576)
[netty-transport-4.1.50.Final.jar:4.1.50.Final]
at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:493)
[netty-transport-4.1.50.Final.jar:4.1.50.Final]
at
io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:989)
[netty-common-4.1.50.Final.jar:4.1.50.Final]
at
io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
[netty-common-4.1.50.Final.jar:4.1.50.Final]
at
io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
[netty-common-4.1.50.Final.jar:4.1.50.Final]
at java.lang.Thread.run(Thread.java:834) [?:?]
2021-02-08T12:42:08.229+0000 [myid:] - WARN
[nioEventLoopGroup-4-1:NettyServerCnxnFactory$CnxnChannelHandler@273] -
Exception caught
java.lang.NullPointerException: null
at
org.apache.zookeeper.server.NettyServerCnxn.receiveMessage(NettyServerCnxn.java:518)
~[zookeeper-3.6.2.jar:3.6.2]
at
org.apache.zookeeper.server.NettyServerCnxn.processMessage(NettyServerCnxn.java:368)
~[zookeeper-3.6.2.jar:3.6.2]
at
org.apache.zookeeper.server.NettyServerCnxnFactory$CnxnChannelHandler.channelRead(NettyServerCnxnFactory.java:326)
~[zookeeper-3.6.2.jar:3.6.2]
at
io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379)
[netty-transport-4.1.50.Final.jar:4.1.50.Final]
at
io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365)
[netty-transport-4.1.50.Final.jar:4.1.50.Final]
at
io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357)
[netty-transport-4.1.50.Final.jar:4.1.50.Final]
at
io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1410)
[netty-transport-4.1.50.Final.jar:4.1.50.Final]
at
io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379)
[netty-transport-4.1.50.Final.jar:4.1.50.Final]
at
io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365)
[netty-transport-4.1.50.Final.jar:4.1.50.Final]
at
io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:919)
[netty-transport-4.1.50.Final.jar:4.1.50.Final]
at
io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:163)
[netty-transport-4.1.50.Final.jar:4.1.50.Final]
at
io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:714)
[netty-transport-4.1.50.Final.jar:4.1.50.Final]
at
io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:650)
[netty-transport-4.1.50.Final.jar:4.1.50.Final]
at
io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:576)
[netty-transport-4.1.50.Final.jar:4.1.50.Final]
at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:493)
[netty-transport-4.1.50.Final.jar:4.1.50.Final]
at
io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:989)
[netty-common-4.1.50.Final.jar:4.1.50.Final]
at
io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
[netty-common-4.1.50.Final.jar:4.1.50.Final]
at
io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
[netty-common-4.1.50.Final.jar:4.1.50.Final]
at java.lang.Thread.run(Thread.java:834) [?:?]
{code}
>
Expectation: This scenario should be handled and application should not throw
such Null Pointer exception.
Thanks & Regards,
Devarshi K. Shah
was (Author: thedevarshishah):
Hi,
While upgrading K8S cluster, container running zookeeper (during serving it's
client) will rollover one by one.
During this rollover, Null Pointer Exception was observed as below.
After updating to the latest ZK 3.6.2 we still see the problem.
This is happening on a fresh install (and has all the time):
<from zk-pod-0-log:
{code:java}
2021-02-08T12:42:08.229+0000 [myid:] - ERROR
[nioEventLoopGroup-4-1:NettyServerCnxnFactory$CnxnChannelHandler@329] -
Unexpected exception in receive
java.lang.NullPointerException: null
at
org.apache.zookeeper.server.NettyServerCnxn.receiveMessage(NettyServerCnxn.java:518)
~[zookeeper-3.6.2.jar:3.6.2]
at
org.apache.zookeeper.server.NettyServerCnxn.processMessage(NettyServerCnxn.java:368)
~[zookeeper-3.6.2.jar:3.6.2]
at
org.apache.zookeeper.server.NettyServerCnxnFactory$CnxnChannelHandler.channelRead(NettyServerCnxnFactory.java:326)
[zookeeper-3.6.2.jar:3.6.2]
at
io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379)
[netty-transport-4.1.50.Final.jar:4.1.50.Final]
at
io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365)
[netty-transport-4.1.50.Final.jar:4.1.50.Final]
at
io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357)
[netty-transport-4.1.50.Final.jar:4.1.50.Final]
at
io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1410)
[netty-transport-4.1.50.Final.jar:4.1.50.Final]
at
io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379)
[netty-transport-4.1.50.Final.jar:4.1.50.Final]
at
io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365)
[netty-transport-4.1.50.Final.jar:4.1.50.Final]
at
io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:919)
[netty-transport-4.1.50.Final.jar:4.1.50.Final]
at
io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:163)
[netty-transport-4.1.50.Final.jar:4.1.50.Final]
at
io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:714)
[netty-transport-4.1.50.Final.jar:4.1.50.Final]
at
io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:650)
[netty-transport-4.1.50.Final.jar:4.1.50.Final]
at
io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:576)
[netty-transport-4.1.50.Final.jar:4.1.50.Final]
at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:493)
[netty-transport-4.1.50.Final.jar:4.1.50.Final]
at
io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:989)
[netty-common-4.1.50.Final.jar:4.1.50.Final]
at
io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
[netty-common-4.1.50.Final.jar:4.1.50.Final]
at
io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
[netty-common-4.1.50.Final.jar:4.1.50.Final]
at java.lang.Thread.run(Thread.java:834) [?:?]
2021-02-08T12:42:08.229+0000 [myid:] - WARN
[nioEventLoopGroup-4-1:NettyServerCnxnFactory$CnxnChannelHandler@273] -
Exception caught
java.lang.NullPointerException: null
at
org.apache.zookeeper.server.NettyServerCnxn.receiveMessage(NettyServerCnxn.java:518)
~[zookeeper-3.6.2.jar:3.6.2]
at
org.apache.zookeeper.server.NettyServerCnxn.processMessage(NettyServerCnxn.java:368)
~[zookeeper-3.6.2.jar:3.6.2]
at
org.apache.zookeeper.server.NettyServerCnxnFactory$CnxnChannelHandler.channelRead(NettyServerCnxnFactory.java:326)
~[zookeeper-3.6.2.jar:3.6.2]
at
io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379)
[netty-transport-4.1.50.Final.jar:4.1.50.Final]
at
io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365)
[netty-transport-4.1.50.Final.jar:4.1.50.Final]
at
io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357)
[netty-transport-4.1.50.Final.jar:4.1.50.Final]
at
io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1410)
[netty-transport-4.1.50.Final.jar:4.1.50.Final]
at
io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379)
[netty-transport-4.1.50.Final.jar:4.1.50.Final]
at
io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365)
[netty-transport-4.1.50.Final.jar:4.1.50.Final]
at
io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:919)
[netty-transport-4.1.50.Final.jar:4.1.50.Final]
at
io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:163)
[netty-transport-4.1.50.Final.jar:4.1.50.Final]
at
io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:714)
[netty-transport-4.1.50.Final.jar:4.1.50.Final]
at
io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:650)
[netty-transport-4.1.50.Final.jar:4.1.50.Final]
at
io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:576)
[netty-transport-4.1.50.Final.jar:4.1.50.Final]
at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:493)
[netty-transport-4.1.50.Final.jar:4.1.50.Final]
at
io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:989)
[netty-common-4.1.50.Final.jar:4.1.50.Final]
at
io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
[netty-common-4.1.50.Final.jar:4.1.50.Final]
at
io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
[netty-common-4.1.50.Final.jar:4.1.50.Final]
at java.lang.Thread.run(Thread.java:834) [?:?]
{code}
>
Expectation: This scenario should be handled and application should not throw
such Null Pointer exception.
Thanks & Regards,
Devarshi K. Shah
> org.apache.zookeeper.server.NettyServerCnxn.receiveMessage throws
> NullPointerException
> --------------------------------------------------------------------------------------
>
> Key: ZOOKEEPER-3988
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-3988
> Project: ZooKeeper
> Issue Type: Bug
> Components: server
> Affects Versions: 3.6.1
> Environment: K8S
> Reporter: Pratik Thacker
> Assignee: David Mollitor
> Priority: Major
> Labels: pull-request-available
> Time Spent: 50m
> Remaining Estimate: 0h
>
> While upgrading K8S cluster, container running zookeeper will rollover one by
> one.
> During this rollover, Null Pointer Exception was observed as below.
> {code:java}
> INFO
> [QuorumPeer[myid=1](plain=0.0.0.0:2181)(secure=0.0.0.0:2281):Follower@292] -
> shutdown FollowerINFO
> [QuorumPeer[myid=1](plain=0.0.0.0:2181)(secure=0.0.0.0:2281):Follower@292] -
> shutdown FollowerINFO
> [QuorumPeer[myid=1](plain=0.0.0.0:2181)(secure=0.0.0.0:2281):LearnerZooKeeperServer@160]
> - Shutting downINFO
> [QuorumPeer[myid=1](plain=0.0.0.0:2181)(secure=0.0.0.0:2281):ZooKeeperServer@784]
> - shutting downINFO
> [QuorumPeer[myid=1](plain=0.0.0.0:2181)(secure=0.0.0.0:2281):RequestThrottler@244]
> - Shutting downINFO [RequestThrottler:RequestThrottler@205] - Draining
> request throttler queueINFO [RequestThrottler:RequestThrottler@181] -
> RequestThrottler shutdown. Dropped 0 requestsINFO
> [QuorumPeer[myid=1](plain=0.0.0.0:2181)(secure=0.0.0.0:2281):FollowerRequestProcessor@148]
> - Shutting downINFO
> [QuorumPeer[myid=1](plain=0.0.0.0:2181)(secure=0.0.0.0:2281):CommitProcessor@617]
> - Shutting downINFO
> [FollowerRequestProcessor:1:FollowerRequestProcessor@112] -
> FollowerRequestProcessor exited loop!INFO
> [CommitProcessor:1:CommitProcessor@406] - CommitProcessor exited loop!INFO
> [QuorumPeer[myid=1](plain=0.0.0.0:2181)(secure=0.0.0.0:2281):FinalRequestProcessor@662]
> - shutdown of request processor completeERROR
> [nioEventLoopGroup-4-22:NettyServerCnxnFactory$CnxnChannelHandler@329] -
> Unexpected exception in receivejava.lang.NullPointerException: null at
> org.apache.zookeeper.server.NettyServerCnxn.receiveMessage(NettyServerCnxn.java:515)
> ~[zookeeper-3.6.1.jar:3.6.1] at
> org.apache.zookeeper.server.NettyServerCnxn.processMessage(NettyServerCnxn.java:365)
> ~[zookeeper-3.6.1.jar:3.6.1] at
> org.apache.zookeeper.server.NettyServerCnxnFactory$CnxnChannelHandler.channelRead(NettyServerCnxnFactory.java:326)
> [zookeeper-3.6.1.jar:3.6.1] at
> io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379)
> [netty-transport-4.1.48.Final.jar:4.1.48.Final] at
> io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365)
> [netty-transport-4.1.48.Final.jar:4.1.48.Final] at
> io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357)
> [netty-transport-4.1.48.Final.jar:4.1.48.Final] at
> io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1410)
> [netty-transport-4.1.48.Final.jar:4.1.48.Final] at
> io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379)
> [netty-transport-4.1.48.Final.jar:4.1.48.Final] at
> io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365)
> [netty-transport-4.1.48.Final.jar:4.1.48.Final] at
> io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:919)
> [netty-transport-4.1.48.Final.jar:4.1.48.Final] at
> io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:163)
> [netty-transport-4.1.48.Final.jar:4.1.48.Final] at
> io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:714)
> [netty-transport-4.1.48.Final.jar:4.1.48.Final] at
> io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:650)
> [netty-transport-4.1.48.Final.jar:4.1.48.Final] at
> io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:576)
> [netty-transport-4.1.48.Final.jar:4.1.48.Final] at
> io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:493)
> [netty-transport-4.1.48.Final.jar:4.1.48.Final] at
> io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:989)
> [netty-common-4.1.48.Final.jar:4.1.48.Final] at
> io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
> [netty-common-4.1.48.Final.jar:4.1.48.Final] at
> io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
> [netty-common-4.1.48.Final.jar:4.1.48.Final] at
> java.lang.Thread.run(Thread.java:834) [?:?]WARN
> [nioEventLoopGroup-4-22:NettyServerCnxnFactory$CnxnChannelHandler@273] -
> Exception caughtjava.lang.NullPointerException: null at
> org.apache.zookeeper.server.NettyServerCnxn.receiveMessage(NettyServerCnxn.java:515)
> ~[zookeeper-3.6.1.jar:3.6.1] at
> org.apache.zookeeper.server.NettyServerCnxn.processMessage(NettyServerCnxn.java:365)
> ~[zookeeper-3.6.1.jar:3.6.1] at
> org.apache.zookeeper.server.NettyServerCnxnFactory$CnxnChannelHandler.channelRead(NettyServerCnxnFactory.java:326)
> ~[zookeeper-3.6.1.jar:3.6.1] at
> io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379)
> [netty-transport-4.1.48.Final.jar:4.1.48.Final] at
> io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365)
> [netty-transport-4.1.48.Final.jar:4.1.48.Final] at
> io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357)
> [netty-transport-4.1.48.Final.jar:4.1.48.Final] at
> io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1410)
> [netty-transport-4.1.48.Final.jar:4.1.48.Final] at
> io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379)
> [netty-transport-4.1.48.Final.jar:4.1.48.Final] at
> io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365)
> [netty-transport-4.1.48.Final.jar:4.1.48.Final] at
> io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:919)
> [netty-transport-4.1.48.Final.jar:4.1.48.Final] at
> io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:163)
> [netty-transport-4.1.48.Final.jar:4.1.48.Final] at
> io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:714)
> [netty-transport-4.1.48.Final.jar:4.1.48.Final] at
> io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:650)
> [netty-transport-4.1.48.Final.jar:4.1.48.Final] at
> io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:576)
> [netty-transport-4.1.48.Final.jar:4.1.48.Final] at
> io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:493)
> [netty-transport-4.1.48.Final.jar:4.1.48.Final] at
> io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:989)
> [netty-common-4.1.48.Final.jar:4.1.48.Final] at
> io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
> [netty-common-4.1.48.Final.jar:4.1.48.Final] at
> io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
> [netty-common-4.1.48.Final.jar:4.1.48.Final] at
> java.lang.Thread.run(Thread.java:834) [?:?] {code}
> Expectation: This scenario should be handled and application should not throw
> such Null Pointer exception.
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