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Posted to issues@activemq.apache.org by "ASF GitHub Bot (Jira)" <ji...@apache.org> on 2020/06/13 16:53:00 UTC
[jira] [Work logged] (ARTEMIS-2803) NPE when trying to configure
clustering
[ https://issues.apache.org/jira/browse/ARTEMIS-2803?focusedWorklogId=445383&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-445383 ]
ASF GitHub Bot logged work on ARTEMIS-2803:
-------------------------------------------
Author: ASF GitHub Bot
Created on: 13/Jun/20 16:52
Start Date: 13/Jun/20 16:52
Worklog Time Spent: 10m
Work Description: jbertram opened a new pull request #3182:
URL: https://github.com/apache/activemq-artemis/pull/3182
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Worklog Id: (was: 445383)
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Time Spent: 10m
> NPE when trying to configure clustering
> ---------------------------------------
>
> Key: ARTEMIS-2803
> URL: https://issues.apache.org/jira/browse/ARTEMIS-2803
> Project: ActiveMQ Artemis
> Issue Type: Bug
> Affects Versions: 2.13.0
> Reporter: Alexander Trauzzi
> Assignee: Justin Bertram
> Priority: Minor
> Time Spent: 10m
> Remaining Estimate: 0h
>
> I've encountered an exception during a bit of exploratory/PoC work I'm doing around clustering.
> I'm making this report mostly on the basis that I haven't been able to infer any cause or course of action from the exception messages. Even if this is a result of a misconfiguration, perhaps the feedback can be improved to make it easier to troubleshoot?
> I have already collated the details over at a question of Stack Overflow, which I've also attached as an external issue URL.
> Here's the config of broker A:
> {code:xml}
> <?xml version='1.0'?>
> <configuration xmlns="urn:activemq" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xi="http://www.w3.org/2001/XInclude" xsi:schemaLocation="urn:activemq /schema/artemis-configuration.xsd">
> <core xmlns="urn:activemq:core" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="urn:activemq:core ">
> <name>0.0.0.0</name>
> <persistence-enabled>true</persistence-enabled>
> <!-- this could be ASYNCIO, MAPPED, NIO
> ASYNCIO: Linux Libaio
> MAPPED: mmap files
> NIO: Plain Java Files
> -->
> <journal-type>ASYNCIO</journal-type>
> <paging-directory>data/paging</paging-directory>
> <bindings-directory>data/bindings</bindings-directory>
> <journal-directory>data/journal</journal-directory>
> <large-messages-directory>data/large-messages</large-messages-directory>
> <journal-datasync>true</journal-datasync>
> <journal-min-files>2</journal-min-files>
> <journal-pool-files>10</journal-pool-files>
> <journal-device-block-size>4096</journal-device-block-size>
> <journal-file-size>10M</journal-file-size>
> <!--
> This value was determined through a calculation.
> Your system could perform 50 writes per millisecond
> on the current journal configuration.
> That translates as a sync write every 20000 nanoseconds.
> Note: If you specify 0 the system will perform writes directly to the disk.
> We recommend this to be 0 if you are using journalType=MAPPED and journal-datasync=false.
> -->
> <journal-buffer-timeout>20000</journal-buffer-timeout>
> <!--
> When using ASYNCIO, this will determine the writing queue depth for libaio.
> -->
> <journal-max-io>4096</journal-max-io>
> <!--
> You can verify the network health of a particular NIC by specifying the <network-check-NIC> element.
> <network-check-NIC>theNicName</network-check-NIC>
> -->
> <!--
> Use this to use an HTTP server to validate the network
> <network-check-URL-list>http://www.apache.org</network-check-URL-list> -->
> <!-- <network-check-period>10000</network-check-period> -->
> <!-- <network-check-timeout>1000</network-check-timeout> -->
> <!-- this is a comma separated list, no spaces, just DNS or IPs
> it should accept IPV6
> Warning: Make sure you understand your network topology as this is meant to validate if your network is valid.
> Using IPs that could eventually disappear or be partially visible may defeat the purpose.
> You can use a list of multiple IPs, and if any successful ping will make the server OK to continue running -->
> <!-- <network-check-list>10.0.0.1</network-check-list> -->
> <!-- use this to customize the ping used for ipv4 addresses -->
> <!-- <network-check-ping-command>ping -c 1 -t %d %s</network-check-ping-command> -->
> <!-- use this to customize the ping used for ipv6 addresses -->
> <!-- <network-check-ping6-command>ping6 -c 1 %2$s</network-check-ping6-command> -->
> <!-- how often we are looking for how many bytes are being used on the disk in ms -->
> <disk-scan-period>5000</disk-scan-period>
> <!-- once the disk hits this limit the system will block, or close the connection in certain protocols
> that won't support flow control. -->
> <max-disk-usage>90</max-disk-usage>
> <!-- should the broker detect dead locks and other issues -->
> <critical-analyzer>true</critical-analyzer>
> <critical-analyzer-timeout>120000</critical-analyzer-timeout>
> <critical-analyzer-check-period>60000</critical-analyzer-check-period>
> <critical-analyzer-policy>HALT</critical-analyzer-policy>
> <page-sync-timeout>1020000</page-sync-timeout>
> <acceptors>
> <!-- Acceptor for every supported protocol -->
> <acceptor name="artemis">tcp://0.0.0.0:61616?tcpSendBufferSize=1048576;tcpReceiveBufferSize=1048576;amqpMinLargeMessageSize=102400;protocols=CORE;useEpoll=true;amqpCredits=1000;amqpLowCredits=300;amqpDuplicateDetection=true</acceptor>
> <!-- STOMP Acceptor. -->
> <acceptor name="stomp">tcp://0.0.0.0:61613?tcpSendBufferSize=1048576;tcpReceiveBufferSize=1048576;protocols=STOMP;useEpoll=true</acceptor>
> </acceptors>
> <cluster-user>cluster</cluster-user>
> <cluster-password>REDACTED</cluster-password>
> <addresses>
> <address name="/queue/global.regional">
> <multicast>
> <queue name="/queue/global.regional">
> <durable>true</durable>
> </queue>
> </multicast>
> </address>
> </addresses>
> <address-settings>
> <!-- if you define auto-create on certain queues, management has to be auto-create -->
> <address-setting match="activemq.management#">
> <dead-letter-address>DLQ</dead-letter-address>
> <expiry-address>ExpiryQueue</expiry-address>
> <redelivery-delay>0</redelivery-delay>
> <!-- with -1 only the global-max-size is in use for limiting -->
> <max-size-bytes>-1</max-size-bytes>
> <message-counter-history-day-limit>10</message-counter-history-day-limit>
> <address-full-policy>PAGE</address-full-policy>
> <auto-create-queues>true</auto-create-queues>
> <auto-create-addresses>true</auto-create-addresses>
> <auto-create-jms-queues>true</auto-create-jms-queues>
> <auto-create-jms-topics>true</auto-create-jms-topics>
> </address-setting>
> <!--default for catch all-->
> <address-setting match="#">
> <!-- <dead-letter-address>DLQ</dead-letter-address>
> <expiry-address>ExpiryQueue</expiry-address>
> <redelivery-delay>0</redelivery-delay> -->
> <!-- with -1 only the global-max-size is in use for limiting -->
> <!-- <max-size-bytes>-1</max-size-bytes>
> <message-counter-history-day-limit>10</message-counter-history-day-limit>
> <address-full-policy>PAGE</address-full-policy>
> <auto-create-queues>true</auto-create-queues>
> <auto-create-addresses>true</auto-create-addresses>
> <auto-create-jms-queues>true</auto-create-jms-queues>
> <auto-create-jms-topics>true</auto-create-jms-topics> -->
> </address-setting>
> </address-settings>
> <security-settings>
> <security-setting match="#">
> <permission type="createNonDurableQueue" roles="amq"/>
> <permission type="deleteNonDurableQueue" roles="amq"/>
> <permission type="createDurableQueue" roles="amq"/>
> <permission type="deleteDurableQueue" roles="amq"/>
> <permission type="createAddress" roles="amq"/>
> <permission type="deleteAddress" roles="amq"/>
> <permission type="consume" roles="amq"/>
> <permission type="browse" roles="amq"/>
> <permission type="send" roles="amq"/>
> <!-- we need this otherwise ./artemis data imp wouldn't work -->
> <permission type="manage" roles="amq"/>
> </security-setting>
> </security-settings>
> </core>
> </configuration>
> {code}
> Here's the config of broker B:
> {code:xml}
> <?xml version='1.0'?>
> <configuration xmlns="urn:activemq" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xi="http://www.w3.org/2001/XInclude" xsi:schemaLocation="urn:activemq /schema/artemis-configuration.xsd">
> <core xmlns="urn:activemq:core" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="urn:activemq:core ">
> <name>0.0.0.0</name>
> <persistence-enabled>true</persistence-enabled>
> <!-- this could be ASYNCIO, MAPPED, NIO
> ASYNCIO: Linux Libaio
> MAPPED: mmap files
> NIO: Plain Java Files
> -->
> <journal-type>ASYNCIO</journal-type>
> <paging-directory>data/paging</paging-directory>
> <bindings-directory>data/bindings</bindings-directory>
> <journal-directory>data/journal</journal-directory>
> <large-messages-directory>data/large-messages</large-messages-directory>
> <journal-datasync>true</journal-datasync>
> <journal-min-files>2</journal-min-files>
> <journal-pool-files>10</journal-pool-files>
> <journal-device-block-size>4096</journal-device-block-size>
> <journal-file-size>10M</journal-file-size>
> <!--
> This value was determined through a calculation.
> Your system could perform 50 writes per millisecond
> on the current journal configuration.
> That translates as a sync write every 20000 nanoseconds.
> Note: If you specify 0 the system will perform writes directly to the disk.
> We recommend this to be 0 if you are using journalType=MAPPED and journal-datasync=false.
> -->
> <journal-buffer-timeout>20000</journal-buffer-timeout>
> <!--
> When using ASYNCIO, this will determine the writing queue depth for libaio.
> -->
> <journal-max-io>4096</journal-max-io>
> <!--
> You can verify the network health of a particular NIC by specifying the <network-check-NIC> element.
> <network-check-NIC>theNicName</network-check-NIC>
> -->
> <!--
> Use this to use an HTTP server to validate the network
> <network-check-URL-list>http://www.apache.org</network-check-URL-list> -->
> <!-- <network-check-period>10000</network-check-period> -->
> <!-- <network-check-timeout>1000</network-check-timeout> -->
> <!-- this is a comma separated list, no spaces, just DNS or IPs
> it should accept IPV6
> Warning: Make sure you understand your network topology as this is meant to validate if your network is valid.
> Using IPs that could eventually disappear or be partially visible may defeat the purpose.
> You can use a list of multiple IPs, and if any successful ping will make the server OK to continue running -->
> <!-- <network-check-list>10.0.0.1</network-check-list> -->
> <!-- use this to customize the ping used for ipv4 addresses -->
> <!-- <network-check-ping-command>ping -c 1 -t %d %s</network-check-ping-command> -->
> <!-- use this to customize the ping used for ipv6 addresses -->
> <!-- <network-check-ping6-command>ping6 -c 1 %2$s</network-check-ping6-command> -->
> <!-- how often we are looking for how many bytes are being used on the disk in ms -->
> <disk-scan-period>5000</disk-scan-period>
> <!-- once the disk hits this limit the system will block, or close the connection in certain protocols
> that won't support flow control. -->
> <max-disk-usage>90</max-disk-usage>
> <!-- should the broker detect dead locks and other issues -->
> <critical-analyzer>true</critical-analyzer>
> <critical-analyzer-timeout>120000</critical-analyzer-timeout>
> <critical-analyzer-check-period>60000</critical-analyzer-check-period>
> <critical-analyzer-policy>HALT</critical-analyzer-policy>
> <page-sync-timeout>1020000</page-sync-timeout>
> <acceptors>
> <acceptor name="stomp">tcp://0.0.0.0:61613?tcpSendBufferSize=1048576;tcpReceiveBufferSize=1048576;protocols=STOMP;useEpoll=true</acceptor>
> </acceptors>
> <connectors>
> <connector name="global">tcp://172.17.0.1:61616</connector>
> </connectors>
> <cluster-user>cluster</cluster-user>
> <cluster-password>REDACTED</cluster-password>
> <cluster-connections>
> <cluster-connection name="global">
> <address>/queue/global.regional</address>
> <connector-ref>global</connector-ref>
> <forward-when-no-consumers>false</forward-when-no-consumers>
> <static-connectors allow-direct-connections-only="true">
> <connector-ref>global</connector-ref>
> </static-connectors>
> </cluster-connection>
> </cluster-connections>
> <addresses>
> </addresses>
> <address-settings>
> <address-setting match="/queue/global.regional">
> <redistribution-delay>0</redistribution-delay>
> </address-setting>
> <!-- if you define auto-create on certain queues, management has to be auto-create -->
> <address-setting match="activemq.management#">
> <dead-letter-address>DLQ</dead-letter-address>
> <expiry-address>ExpiryQueue</expiry-address>
> <redelivery-delay>0</redelivery-delay>
> <!-- with -1 only the global-max-size is in use for limiting -->
> <max-size-bytes>-1</max-size-bytes>
> <message-counter-history-day-limit>10</message-counter-history-day-limit>
> <address-full-policy>PAGE</address-full-policy>
> <auto-create-queues>true</auto-create-queues>
> <auto-create-addresses>true</auto-create-addresses>
> <auto-create-jms-queues>true</auto-create-jms-queues>
> <auto-create-jms-topics>true</auto-create-jms-topics>
> </address-setting>
> <!--default for catch all-->
> <address-setting match="#">
> <!-- <dead-letter-address>DLQ</dead-letter-address>
> <expiry-address>ExpiryQueue</expiry-address>
> <redelivery-delay>0</redelivery-delay> -->
> <!-- with -1 only the global-max-size is in use for limiting -->
> <!-- <max-size-bytes>-1</max-size-bytes>
> <message-counter-history-day-limit>10</message-counter-history-day-limit>
> <address-full-policy>PAGE</address-full-policy>
> <auto-create-queues>true</auto-create-queues>
> <auto-create-addresses>true</auto-create-addresses>
> <auto-create-jms-queues>true</auto-create-jms-queues>
> <auto-create-jms-topics>true</auto-create-jms-topics> -->
> </address-setting>
> </address-settings>
> <security-settings>
> <security-setting match="#">
> <permission type="createNonDurableQueue" roles="amq"/>
> <permission type="deleteNonDurableQueue" roles="amq"/>
> <permission type="createDurableQueue" roles="amq"/>
> <permission type="deleteDurableQueue" roles="amq"/>
> <permission type="createAddress" roles="amq"/>
> <permission type="deleteAddress" roles="amq"/>
> <permission type="consume" roles="amq"/>
> <permission type="browse" roles="amq"/>
> <permission type="send" roles="amq"/>
> <!-- we need this otherwise ./artemis data imp wouldn't work -->
> <permission type="manage" roles="amq"/>
> </security-setting>
> </security-settings>
> </core>
> </configuration>
> {code}
> Following are the two exception messages I'm getting from the broker I'm trying to _connect to_:
> {noformat}
> 2020-06-12 14:08:00,524 ERROR [org.apache.activemq.artemis.core.client] AMQ214013: Failed to decode packet: java.lang.NullPointerException
> at org.apache.activemq.artemis.core.server.cluster.ClusterController$ClusterControllerChannelHandler.handlePacket(ClusterController.java:364) [artemis-server-2.13.0.jar:2.13.0]
> at org.apache.activemq.artemis.core.protocol.core.impl.ChannelImpl.handlePacket(ChannelImpl.java:720) [artemis-core-client-2.13.0.jar:2.13.0]
> at org.apache.activemq.artemis.core.protocol.core.impl.RemotingConnectionImpl.doBufferReceived(RemotingConnectionImpl.java:408) [artemis-core-client-2.13.0.jar:2.13.0]
> at org.apache.activemq.artemis.core.protocol.core.impl.RemotingConnectionImpl.bufferReceived(RemotingConnectionImpl.java:385) [artemis-core-client-2.13.0.jar:2.13.0]
> at org.apache.activemq.artemis.core.remoting.server.impl.RemotingServiceImpl$DelegatingBufferHandler.bufferReceived(RemotingServiceImpl.java:667) [artemis-server-2.13.0.jar:2.13.0]
> at org.apache.activemq.artemis.core.remoting.impl.netty.ActiveMQChannelHandler.channelRead(ActiveMQChannelHandler.java:73) [artemis-core-client-2.13.0.jar:2.13.0]
> at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379) [netty-all-4.1.48.Final.jar:4.1.48.Final]
> at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365) [netty-all-4.1.48.Final.jar:4.1.48.Final]
> at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357) [netty-all-4.1.48.Final.jar:4.1.48.Final]
> at io.netty.handler.codec.ByteToMessageDecoder.fireChannelRead(ByteToMessageDecoder.java:321) [netty-all-4.1.48.Final.jar:4.1.48.Final]
> at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:295) [netty-all-4.1.48.Final.jar:4.1.48.Final]
> at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379) [netty-all-4.1.48.Final.jar:4.1.48.Final]
> at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365) [netty-all-4.1.48.Final.jar:4.1.48.Final]
> at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357) [netty-all-4.1.48.Final.jar:4.1.48.Final]
> at io.netty.handler.codec.ByteToMessageDecoder.handlerRemoved(ByteToMessageDecoder.java:253) [netty-all-4.1.48.Final.jar:4.1.48.Final]
> at io.netty.handler.codec.ByteToMessageDecoder.decodeRemovalReentryProtection(ByteToMessageDecoder.java:505) [netty-all-4.1.48.Final.jar:4.1.48.Final]
> at io.netty.handler.codec.ByteToMessageDecoder.callDecode(ByteToMessageDecoder.java:437) [netty-all-4.1.48.Final.jar:4.1.48.Final]
> at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:276) [netty-all-4.1.48.Final.jar:4.1.48.Final]
> at org.apache.activemq.artemis.core.protocol.ProtocolHandler$ProtocolDecoder.channelRead(ProtocolHandler.java:142) [artemis-server-2.13.0.jar:2.13.0]
> at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379) [netty-all-4.1.48.Final.jar:4.1.48.Final]
> at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365) [netty-all-4.1.48.Final.jar:4.1.48.Final]
> at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357) [netty-all-4.1.48.Final.jar:4.1.48.Final]
> at io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1410) [netty-all-4.1.48.Final.jar:4.1.48.Final]
> at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379) [netty-all-4.1.48.Final.jar:4.1.48.Final]
> at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365) [netty-all-4.1.48.Final.jar:4.1.48.Final]
> at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:919) [netty-all-4.1.48.Final.jar:4.1.48.Final]
> at io.netty.channel.epoll.AbstractEpollStreamChannel$EpollStreamUnsafe.epollInReady(AbstractEpollStreamChannel.java:792) [netty-all-4.1.48.Final.jar:4.1.48.Final]
> at io.netty.channel.epoll.EpollEventLoop.processReady(EpollEventLoop.java:475) [netty-all-4.1.48.Final.jar:4.1.48.Final]
> at io.netty.channel.epoll.EpollEventLoop.run(EpollEventLoop.java:378) [netty-all-4.1.48.Final.jar:4.1.48.Final]
> at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:989) [netty-all-4.1.48.Final.jar:4.1.48.Final]
> at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74) [netty-all-4.1.48.Final.jar:4.1.48.Final]
> at org.apache.activemq.artemis.utils.ActiveMQThreadFactory$1.run(ActiveMQThreadFactory.java:118) [artemis-commons-2.13.0.jar:2.13.0]
> 2020-06-12 14:08:00,525 WARN [org.apache.activemq.artemis.core.server] AMQ222218: Server disconnecting: Error decoding buffer: java.lang.IllegalStateException: java.lang.NullPointerException
> at org.apache.activemq.artemis.core.protocol.core.impl.RemotingConnectionImpl.bufferReceived(RemotingConnectionImpl.java:390) [artemis-core-client-2.13.0.jar:2.13.0]
> at org.apache.activemq.artemis.core.remoting.server.impl.RemotingServiceImpl$DelegatingBufferHandler.bufferReceived(RemotingServiceImpl.java:667) [artemis-server-2.13.0.jar:2.13.0]
> at org.apache.activemq.artemis.core.remoting.impl.netty.ActiveMQChannelHandler.channelRead(ActiveMQChannelHandler.java:73) [artemis-core-client-2.13.0.jar:2.13.0]
> at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379) [netty-all-4.1.48.Final.jar:4.1.48.Final]
> at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365) [netty-all-4.1.48.Final.jar:4.1.48.Final]
> at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357) [netty-all-4.1.48.Final.jar:4.1.48.Final]
> at io.netty.handler.codec.ByteToMessageDecoder.fireChannelRead(ByteToMessageDecoder.java:321) [netty-all-4.1.48.Final.jar:4.1.48.Final]
> at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:295) [netty-all-4.1.48.Final.jar:4.1.48.Final]
> at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379) [netty-all-4.1.48.Final.jar:4.1.48.Final]
> at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365) [netty-all-4.1.48.Final.jar:4.1.48.Final]
> at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357) [netty-all-4.1.48.Final.jar:4.1.48.Final]
> at io.netty.handler.codec.ByteToMessageDecoder.handlerRemoved(ByteToMessageDecoder.java:253) [netty-all-4.1.48.Final.jar:4.1.48.Final]
> at io.netty.handler.codec.ByteToMessageDecoder.decodeRemovalReentryProtection(ByteToMessageDecoder.java:505) [netty-all-4.1.48.Final.jar:4.1.48.Final]
> at io.netty.handler.codec.ByteToMessageDecoder.callDecode(ByteToMessageDecoder.java:437) [netty-all-4.1.48.Final.jar:4.1.48.Final]
> at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:276) [netty-all-4.1.48.Final.jar:4.1.48.Final]
> at org.apache.activemq.artemis.core.protocol.ProtocolHandler$ProtocolDecoder.channelRead(ProtocolHandler.java:142) [artemis-server-2.13.0.jar:2.13.0]
> at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379) [netty-all-4.1.48.Final.jar:4.1.48.Final]
> at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365) [netty-all-4.1.48.Final.jar:4.1.48.Final]
> at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357) [netty-all-4.1.48.Final.jar:4.1.48.Final]
> at io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1410) [netty-all-4.1.48.Final.jar:4.1.48.Final]
> at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379) [netty-all-4.1.48.Final.jar:4.1.48.Final]
> at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365) [netty-all-4.1.48.Final.jar:4.1.48.Final]
> at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:919) [netty-all-4.1.48.Final.jar:4.1.48.Final]
> at io.netty.channel.epoll.AbstractEpollStreamChannel$EpollStreamUnsafe.epollInReady(AbstractEpollStreamChannel.java:792) [netty-all-4.1.48.Final.jar:4.1.48.Final]
> at io.netty.channel.epoll.EpollEventLoop.processReady(EpollEventLoop.java:475) [netty-all-4.1.48.Final.jar:4.1.48.Final]
> at io.netty.channel.epoll.EpollEventLoop.run(EpollEventLoop.java:378) [netty-all-4.1.48.Final.jar:4.1.48.Final]
> at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:989) [netty-all-4.1.48.Final.jar:4.1.48.Final]
> at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74) [netty-all-4.1.48.Final.jar:4.1.48.Final]
> at org.apache.activemq.artemis.utils.ActiveMQThreadFactory$1.run(ActiveMQThreadFactory.java:118) [artemis-commons-2.13.0.jar:2.13.0]
> Caused by: java.lang.NullPointerException
> at org.apache.activemq.artemis.core.server.cluster.ClusterController$ClusterControllerChannelHandler.handlePacket(ClusterController.java:364) [artemis-server-2.13.0.jar:2.13.0]
> at org.apache.activemq.artemis.core.protocol.core.impl.ChannelImpl.handlePacket(ChannelImpl.java:720) [artemis-core-client-2.13.0.jar:2.13.0]
> at org.apache.activemq.artemis.core.protocol.core.impl.RemotingConnectionImpl.doBufferReceived(RemotingConnectionImpl.java:408) [artemis-core-client-2.13.0.jar:2.13.0]
> at org.apache.activemq.artemis.core.protocol.core.impl.RemotingConnectionImpl.bufferReceived(RemotingConnectionImpl.java:385) [artemis-core-client-2.13.0.jar:2.13.0]
> ... 28 more
> 2020-06-12 14:08:00,528 WARN [org.apache.activemq.artemis.core.client] AMQ212037: Connection failure to /172.31.0.5:52646 has been detected: java.lang.NullPointerException [code=GENERIC_EXCEPTION]
> {noformat}
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