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Posted to issues@zookeeper.apache.org by "Devarshi Shah (Jira)" <ji...@apache.org> on 2021/02/15 12:06:00 UTC
[jira] [Comment Edited] (ZOOKEEPER-3988)
org.apache.zookeeper.server.NettyServerCnxn.receiveMessage throws
NullPointerException
[ 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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