[ARTEMIS-502] AMQ224044, error acknowledging message: java.lang.NullPointerException, can happen sometimes during load

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 1.0.0, 1.1.0, 1.2.0, 1.3.0
• Fix Version/s: 1.3.0
• Component/s: Broker
• Assignee: Unassigned
• Reporter: Ingo Weiss
• Created: 25/Apr/16 08:01
• Updated: 03/Nov/16 20:41
• Resolved: 25/Apr/16 17:29

Description

When under heavy load, the broker can sometimes log this NPE:

04:53:44,897 ERROR [org.apache.activemq.artemis.core.server] (default I/O-4) AMQ224044: error acknowledging message: java.lang.NullPointerException
	at org.apache.activemq.artemis.core.server.impl.ServerConsumerImpl.removeReferenceByID(ServerConsumerImpl.java:796)
	at org.apache.activemq.artemis.core.server.impl.ServerConsumerImpl.individualAcknowledge(ServerConsumerImpl.java:726)
	at org.apache.activemq.artemis.core.server.impl.ServerSessionImpl.individualAcknowledge(ServerSessionImpl.java:738)
	at org.apache.activemq.artemis.core.protocol.core.ServerSessionPacketHandler.handlePacket(ServerSessionPacketHandler.java:408)
	at org.apache.activemq.artemis.core.protocol.core.impl.ChannelImpl.handlePacket(ChannelImpl.java:567)
	at org.apache.activemq.artemis.core.protocol.core.impl.RemotingConnectionImpl.doBufferReceived(RemotingConnectionImpl.java:349)
	at org.apache.activemq.artemis.core.protocol.core.impl.RemotingConnectionImpl.bufferReceived(RemotingConnectionImpl.java:331)
	at org.apache.activemq.artemis.core.remoting.server.impl.RemotingServiceImpl$DelegatingBufferHandler.bufferReceived(RemotingServiceImpl.java:605)
	at org.apache.activemq.artemis.core.remoting.impl.netty.ActiveMQChannelHandler.channelRead(ActiveMQChannelHandler.java:68)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:308)
	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:294)
	at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:265)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:308)
	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:294)
	at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:846)
	at org.xnio.netty.transport.AbstractXnioSocketChannel$ReadListener.handleEvent(AbstractXnioSocketChannel.java:435)
	at org.xnio.netty.transport.AbstractXnioSocketChannel$ReadListener.handleEvent(AbstractXnioSocketChannel.java:371)
	at org.xnio.ChannelListeners.invokeChannelListener(ChannelListeners.java:92) [xnio-api-3.3.4.Final-redhat-1.jar:3.3.4.Final-redhat-1]
	at org.xnio.conduits.ReadReadyHandler$ChannelListenerHandler.readReady(ReadReadyHandler.java:66) [xnio-api-3.3.4.Final-redhat-1.jar:3.3.4.Final-redhat-1]
	at org.xnio.nio.NioSocketConduit.handleReady(NioSocketConduit.java:88) [xnio-nio-3.3.4.Final-redhat-1.jar:3.3.4.Final-redhat-1]
	at org.xnio.nio.WorkerThread.run(WorkerThread.java:559) [xnio-nio-3.3.4.Final-redhat-1.jar:3.3.4.Final-redhat-1]