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https://issues.apache.org/jira/browse/ARTEMIS-5551?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17987988#comment-17987988
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Justin Bertram commented on ARTEMIS-5551:
-----------------------------------------
{quote}do you have a compose file I could use to start a cluster of 2 hornetq
brokers?{quote}
I don't.
> HornetQClientProtocolManager NPE when shutting down one member
> --------------------------------------------------------------
>
> Key: ARTEMIS-5551
> URL: https://issues.apache.org/jira/browse/ARTEMIS-5551
> Project: ActiveMQ Artemis
> Issue Type: Bug
> Reporter: Vincent Sevel
> Priority: Minor
>
> I have a Quarkus application connecting to a HornetQ broker (cluster of 2
> replicas). We are using the {{artemis-hqclient-protocol}} version 2.41.0.
> When shutting down one member, my application continues to work on the other
> member, but several error messages gets logged including the following NPE:
> {noformat}
> 2025-06-23 11:54:31,746 ERROR [org.apache.activemq.artemis.core.client]
> (Thread-11 (ActiveMQ-client-netty-threads)) AMQ214031: Failed to decode
> buffer, disconnect immediately.
> java.lang.IllegalStateException: java.lang.NullPointerException: Cannot
> invoke "org.apache.activemq.artemis.api.core.Pair.getA()" because the return
> value of
> "org.apache.activemq.artemis.core.protocol.core.impl.wireformat.ClusterTopologyChangeMessage.getPair()"
> is null
> at
> org.apache.activemq.artemis.core.protocol.core.impl.RemotingConnectionImpl.bufferReceived(RemotingConnectionImpl.java:386)
> at
> org.apache.activemq.artemis.core.client.impl.ClientSessionFactoryImpl$DelegatingBufferHandler.bufferReceived(ClientSessionFactoryImpl.java:1324)
> at
> org.apache.activemq.artemis.core.remoting.impl.netty.ActiveMQChannelHandler.channelRead(ActiveMQChannelHandler.java:73)
> at
> io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:442)
> at
> io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:420)
> at
> io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:412)
> at
> io.netty.handler.codec.ByteToMessageDecoder.fireChannelRead(ByteToMessageDecoder.java:346)
> at
> io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:318)
> at
> io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:444)
> at
> io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:420)
> at
> io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:412)
> at
> io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1357)
> at
> io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:440)
> at
> io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:420)
> at
> io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:868)
> at
> io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:166)
> at
> io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:796)
> at
> io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:732)
> at
> io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:658)
> at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:562)
> at
> io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:998)
> at
> io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
> at
> org.apache.activemq.artemis.utils.ActiveMQThreadFactory$1.run(ActiveMQThreadFactory.java:120)
> Caused by: java.lang.NullPointerException: Cannot invoke
> "org.apache.activemq.artemis.api.core.Pair.getA()" because the return value
> of
> "org.apache.activemq.artemis.core.protocol.core.impl.wireformat.ClusterTopologyChangeMessage.getPair()"
> is null
> at
> org.apache.activemq.artemis.core.protocol.hornetq.client.HornetQClientProtocolManager.updateTransportConfiguration(HornetQClientProtocolManager.java:78)
> at
> org.apache.activemq.artemis.core.protocol.core.impl.ActiveMQClientProtocolManager$Channel0Handler.handlePacket(ActiveMQClientProtocolManager.java:487)
> at
> org.apache.activemq.artemis.core.protocol.core.impl.ChannelImpl.handlePacket(ChannelImpl.java:854)
> at
> org.apache.activemq.artemis.core.protocol.core.impl.RemotingConnectionImpl.doBufferReceived(RemotingConnectionImpl.java:408)
> at
> org.apache.activemq.artemis.core.protocol.core.impl.RemotingConnectionImpl.bufferReceived(RemotingConnectionImpl.java:381)
> ... 22 more{noformat}
> {{HornetQClientProtocolManager}} should be made more defensive in
> {{updateTransportConfiguration()}}.
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