Standalone JMS Client repeats throwing NPE when using Artemis Core API for JGroups Dynamic Discovery ---------------------------------------------------------------------------------------------------- Key: WFLY-9365 URL: https://issues.jboss.org/browse/WFLY-9365 Project: WildFly Issue Type: Bug Components: JMS Affects Versions: 11.0.0.CR1 Reporter: Masafumi Miura Assignee: Jeff Mesnil Attachments: artemis-core-api-client.zip When a standalone Java client uses Artemis Core API for JGroups Dynamic Discovery, it repeats throwing the following NPE: {code} SEVERE [null] JGRP000027: failed passing message up (org.jgroups.protocols.TP$SingleMessageHandler run) java.lang.NullPointerException at java.util.concurrent.LinkedBlockingDeque.offerLast(LinkedBlockingDeque.java:357) at java.util.concurrent.LinkedBlockingDeque.addLast(LinkedBlockingDeque.java:334) at java.util.concurrent.LinkedBlockingDeque.add(LinkedBlockingDeque.java:633) at org.apache.activemq.artemis.api.core.jgroups.JGroupsReceiver.receive(JGroupsReceiver.java:41) at org.apache.activemq.artemis.api.core.jgroups.JChannelWrapper$1.receive(JChannelWrapper.java:69) at org.jgroups.JChannel.invokeCallback(JChannel.java:816) at org.jgroups.JChannel.up(JChannel.java:741) at org.jgroups.stack.ProtocolStack.up(ProtocolStack.java:1030) at org.jgroups.protocols.FRAG2.up(FRAG2.java:165) at org.jgroups.protocols.FlowControl.up(FlowControl.java:374) at org.jgroups.protocols.FlowControl.up(FlowControl.java:390) at org.jgroups.protocols.pbcast.GMS.up(GMS.java:1037) at org.jgroups.protocols.pbcast.STABLE.up(STABLE.java:234) at org.jgroups.protocols.UNICAST3.up(UNICAST3.java:442) at org.jgroups.protocols.pbcast.NAKACK2.up(NAKACK2.java:649) at org.jgroups.protocols.VERIFY_SUSPECT.up(VERIFY_SUSPECT.java:155) at org.jgroups.protocols.FD_ALL.up(FD_ALL.java:200) at org.jgroups.protocols.FD.up(FD.java:260) at org.jgroups.protocols.MERGE3.up(MERGE3.java:292) at org.jgroups.protocols.Discovery.up(Discovery.java:296) at org.jgroups.protocols.TP.passMessageUp(TP.java:1657) at org.jgroups.protocols.TP$SingleMessageHandler.run(TP.java:1872) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) at java.lang.Thread.run(Thread.java:748) {code} Also the following IndexOutOfBoundsException sometime occurred. (Not continually but sometime frequently): {code} ERROR [org.apache.activemq.artemis.core.client] AMQ214010: Failed to receive datagram (org.apache.activemq.artemis.core.cluster.DiscoveryGroup$DiscoveryRunnable run) java.lang.IndexOutOfBoundsException: readerIndex(8) + length(1040187409) exceeds writerIndex(11): UnpooledHeapByteBuf(ridx: 8, widx: 11, cap: 11/11) at io.netty.buffer.AbstractByteBuf.checkReadableBytes0(AbstractByteBuf.java:1396) at io.netty.buffer.AbstractByteBuf.checkReadableBytes(AbstractByteBuf.java:1383) at io.netty.buffer.AbstractByteBuf.readBytes(AbstractByteBuf.java:850) at io.netty.buffer.AbstractByteBuf.readBytes(AbstractByteBuf.java:858) at io.netty.buffer.WrappedByteBuf.readBytes(WrappedByteBuf.java:649) at org.apache.activemq.artemis.core.buffers.impl.ChannelBufferWrapper.readSimpleStringInternal(ChannelBufferWrapper.java:93) at org.apache.activemq.artemis.core.buffers.impl.ChannelBufferWrapper.readStringInternal(ChannelBufferWrapper.java:114) at org.apache.activemq.artemis.core.buffers.impl.ChannelBufferWrapper.readString(ChannelBufferWrapper.java:99) at org.apache.activemq.artemis.core.cluster.DiscoveryGroup$DiscoveryRunnable.run(DiscoveryGroup.java:274) at java.lang.Thread.run(Thread.java:748) {code} The standalone Java client calles Artemis Core API to use JGroups Dynamic Discovery like the following. See the attached reproducer for details. {code} private static final String channelName = "ee"; private static final String jgroupsConfigFile = "jgroups-custom-config.xml"; String uri = "jgroups://" + channelName + "?file=" + jgroupsConfigFile + "&type=QUEUE_CF"; ActiveMQConnectionFactory cf = ActiveMQJMSClient.createConnectionFactory(uri, "..."); Queue queue = ActiveMQJMSClient.createQueue("testQueue"); try (JMSContext jmsContext = cf.createContext("test", "test@123")) { // sending messages or recieving messages } {code}