ARTEMIS-5038 Mirrored ACKs are broken if using multiple priorities on producers

PriorityLinkedList has multiple sub-lists, before this commit PriorityLinkedList::setNodeStore would set the same node store between all the lists.
When a removeWithID was called for an item on list[0] the remove from list[4] would always succeed first. This operation would work correctly most of the time except
when tail and head is being used. Many NullPointerExceptions would be seen while iterating on the list for remove operations, and the navigation would be completely broken.

A test was added to PriorityLinkedListTest to make sure the correct lists were used however I was not able to reproduce the NPE condition in that test.
AccumulatedInPageSoakTest reproduced the exact condition for the NPE when significant load is used.

artemis-commons/src/main/java/org/apache/activemq/artemis/utils/FileUtil.java

@@ -16,8 +16,11 @@
  */
 package org.apache.activemq.artemis.utils;
 
+import java.io.BufferedReader;
 import java.io.File;
 import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
 import java.lang.invoke.MethodHandles;
 import java.nio.file.FileVisitResult;
 import java.nio.file.Files;
@@ -27,6 +30,10 @@ import java.nio.file.StandardCopyOption;
 import java.nio.file.attribute.BasicFileAttributes;
 import java.util.Arrays;
 import java.util.HashSet;
+import java.util.concurrent.atomic.AtomicBoolean;
+import java.util.function.Predicate;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
 
 import org.apache.activemq.artemis.logs.ActiveMQUtilLogger;
 import org.slf4j.Logger;
@@ -126,4 +133,21 @@ public class FileUtil {
       }
    }
 
+   public static String readFile(InputStream inputStream) throws Exception {
+      BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream));
+      String fileOutput = bufferedReader.lines().collect(Collectors.joining(System.lineSeparator()));
+      return fileOutput;
+   }
+
+   public static boolean find(File file, Predicate<String> search) throws Exception {
+      AtomicBoolean found = new AtomicBoolean(false);
+      try (Stream<String> lines = Files.lines(file.toPath())) {
+         lines.filter(search::test).findFirst().ifPresent(line -> {
+            logger.info("pattern found at {}", line);
+            found.set(true);
+         });
+      }
+      return found.get();
+   }
+
 }

artemis-commons/src/main/java/org/apache/activemq/artemis/utils/collections/EmptyList.java

@@ -61,6 +61,11 @@ public class EmptyList<E> implements LinkedList<E> {
       public void repeat() {
       }
 
+      @Override
+      public E removeLastElement() {
+         return null;
+      }
+
       @Override
       public void close() {
       }

artemis-commons/src/main/java/org/apache/activemq/artemis/utils/collections/LinkedListImpl.java

@@ -599,15 +599,22 @@ public class LinkedListImpl<E> implements LinkedList<E> {
 
       @Override
       public void remove() {
+         removeLastElement();
+      }
+
+      @Override
+      public E removeLastElement() {
          synchronized (LinkedListImpl.this) {
             if (last == null) {
                throw new NoSuchElementException();
             }
 
             if (current == null) {
-               return;
+               return null;
             }
 
+            E returningElement = current.val();
+
             Node<E> prev = current.prev;
 
             if (prev != null) {
@@ -615,6 +622,8 @@ public class LinkedListImpl<E> implements LinkedList<E> {
 
                last = null;
             }
+
+            return returningElement;
          }
       }
 

artemis-commons/src/main/java/org/apache/activemq/artemis/utils/collections/LinkedListIterator.java

@@ -27,6 +27,9 @@ public interface LinkedListIterator<E> extends Iterator<E>, AutoCloseable {
 
    void repeat();
 
+   /** This method is doing exactly what {@link Iterator#remove()} would do, however it will return the removed element being removed. */
+   E removeLastElement();
+
    @Override
    void close();
 }

artemis-commons/src/main/java/org/apache/activemq/artemis/utils/collections/NodeStore.java

@@ -30,6 +30,14 @@ public interface NodeStore<E> {
 
    void removeNode(E element, LinkedListImpl.Node<E> node);
 
+   default NodeStore<E> setName(String name) {
+      return this;
+   }
+
+   default String getName() {
+      return null;
+   }
+
    /** this is meant to be a quick help to Garbage Collection.
     *  Whenever the IDSupplier list is being cleared, you should first call the clear method and
     *  empty every list before you let the instance go. */

artemis-commons/src/main/java/org/apache/activemq/artemis/utils/collections/PriorityLinkedList.java

@@ -16,6 +16,8 @@
  */
 package org.apache.activemq.artemis.utils.collections;
 
+import java.util.function.Supplier;
+
 /**
  * A type of linked list which maintains items according to a priority
  * and allows adding and removing of elements at both ends, and peeking.<br>
@@ -40,7 +42,7 @@ public interface PriorityLinkedList<E> {
     * @see LinkedList#setNodeStore(NodeStore)
     * @param supplier
     */
-   void setNodeStore(NodeStore<E> supplier);
+   void setNodeStore(Supplier<NodeStore<E>> supplier);
 
    E removeWithID(String listID, long id);
 

artemis-commons/src/main/java/org/apache/activemq/artemis/utils/collections/PriorityLinkedListImpl.java

@@ -20,6 +20,7 @@ import java.lang.reflect.Array;
 import java.util.Comparator;
 import java.util.NoSuchElementException;
 import java.util.concurrent.atomic.AtomicIntegerFieldUpdater;
+import java.util.function.Supplier;
 
 /**
  * A priority linked list implementation
@@ -40,6 +41,10 @@ public class PriorityLinkedListImpl<E> implements PriorityLinkedList<E> {
 
    private int lastPriority = -1;
 
+   protected void removed(final int level, final E element) {
+      exclusiveIncrementSize(-1);
+   }
+
    public PriorityLinkedListImpl(final int priorities) {
       this(priorities, null);
    }
@@ -96,9 +101,10 @@ public class PriorityLinkedListImpl<E> implements PriorityLinkedList<E> {
    }
 
    @Override
-   public void setNodeStore(NodeStore<E> supplier) {
+   public void setNodeStore(Supplier<NodeStore<E>> supplier) {
       for (LinkedList<E> list : levels) {
-         list.setNodeStore(supplier);
+         NodeStore<E> nodeStore = supplier.get();
+         list.setNodeStore(nodeStore);
       }
    }
 
@@ -109,7 +115,7 @@ public class PriorityLinkedListImpl<E> implements PriorityLinkedList<E> {
          for (int l = 4; l < levels.length; l++) {
             E removed = levels[l].removeWithID(listID, id);
             if (removed != null) {
-               exclusiveIncrementSize(-1);
+               removed(l, removed);
                return removed;
             }
          }
@@ -118,7 +124,7 @@ public class PriorityLinkedListImpl<E> implements PriorityLinkedList<E> {
       for (int l = Math.min(3, levels.length); l >= 0; l--) {
          E removed = levels[l].removeWithID(listID, id);
          if (removed != null) {
-            exclusiveIncrementSize(-1);
+            removed(l, removed);
             return removed;
          }
       }
@@ -155,7 +161,7 @@ public class PriorityLinkedListImpl<E> implements PriorityLinkedList<E> {
             e = ll.poll();
 
             if (e != null) {
-               exclusiveIncrementSize(-1);
+               removed(i, e);
 
                if (ll.size() == 0) {
                   if (highestPriority == i) {
@@ -211,6 +217,8 @@ public class PriorityLinkedListImpl<E> implements PriorityLinkedList<E> {
 
       private LinkedListIterator<E> lastIter;
 
+      private int lastLevel = -1;
+
       private int resetCount = lastReset;
 
       volatile boolean closed = false;
@@ -233,6 +241,7 @@ public class PriorityLinkedListImpl<E> implements PriorityLinkedList<E> {
          if (!closed) {
             closed = true;
             lastIter = null;
+            lastLevel = -1;
 
             for (LinkedListIterator<E> iter : cachedIters) {
                if (iter != null) {
@@ -256,6 +265,7 @@ public class PriorityLinkedListImpl<E> implements PriorityLinkedList<E> {
 
          while (index >= 0) {
             lastIter = cachedIters[index];
+            lastLevel = index;
 
             if (lastIter == null) {
                lastIter = cachedIters[index] = levels[index].iterator();
@@ -289,18 +299,25 @@ public class PriorityLinkedListImpl<E> implements PriorityLinkedList<E> {
 
       @Override
       public void remove() {
+         removeLastElement();
+      }
+
+      @Override
+      public E removeLastElement() {
          if (lastIter == null) {
             throw new NoSuchElementException();
          }
 
-         lastIter.remove();
+         E returningElement = lastIter.removeLastElement();
 
          // If the last message in the current priority is removed then find the next highest
          for (int i = index; i >= 0 && levels[i].size() == 0; i--) {
             highestPriority = i;
          }
 
-         exclusiveIncrementSize(-1);
+         removed(lastLevel, returningElement);
+
+         return returningElement;
       }
    }
 }

artemis-protocols/artemis-amqp-protocol/src/main/java/org/apache/activemq/artemis/protocol/amqp/connect/mirror/ReferenceNodeStore.java

@@ -21,6 +21,7 @@ import java.util.HashMap;
 import io.netty.util.collection.LongObjectHashMap;
 import org.apache.activemq.artemis.api.core.Message;
 import org.apache.activemq.artemis.core.server.MessageReference;
+import org.apache.activemq.artemis.protocol.amqp.logger.ActiveMQAMQPProtocolLogger;
 import org.apache.activemq.artemis.utils.collections.NodeStore;
 import org.apache.activemq.artemis.utils.collections.LinkedListImpl;
 
@@ -35,9 +36,26 @@ public class ReferenceNodeStore implements NodeStore<MessageReference> {
    // This is where the messages are stored by server id...
    HashMap<String, LongObjectHashMap<LinkedListImpl.Node<MessageReference>>> lists;
 
+   String name;
+
    String lruListID;
    LongObjectHashMap<LinkedListImpl.Node<MessageReference>> lruMap;
 
+   @Override
+   public String toString() {
+      return "ReferenceNodeStore{" + "name='" + name + "'}" + "@" + Integer.toHexString(System.identityHashCode(ReferenceNodeStore.this));
+   }
+
+   @Override
+   public NodeStore<MessageReference> setName(String name) {
+      this.name = name;
+      return this;
+   }
+
+   @Override
+   public String getName() {
+      return name;
+   }
 
    @Override
    public void storeNode(MessageReference element, LinkedListImpl.Node<MessageReference> node) {
@@ -50,7 +68,10 @@ public class ReferenceNodeStore implements NodeStore<MessageReference> {
       LongObjectHashMap<LinkedListImpl.Node<MessageReference>> nodesMap = getMap(serverID);
       if (nodesMap != null) {
          synchronized (nodesMap) {
-            nodesMap.put(id, node);
+            LinkedListImpl.Node<MessageReference> previousNode = nodesMap.put(id, node);
+            if (previousNode != null) {
+               ActiveMQAMQPProtocolLogger.LOGGER.duplicateNodeStoreID(name, serverID, id, new Exception("trace"));
+            }
          }
       }
    }

artemis-protocols/artemis-amqp-protocol/src/main/java/org/apache/activemq/artemis/protocol/amqp/logger/ActiveMQAMQPProtocolLogger.java

@@ -64,4 +64,7 @@ public interface ActiveMQAMQPProtocolLogger {
 
    @LogMessage(id = 111009, value = "The AckManager was interrupt. timeout = {} milliseconds", level = LogMessage.Level.WARN)
    void interruptedAckManager(Exception e);
+
+   @LogMessage(id = 111010, value = "Duplicate AckManager node detected. Queue={}, ServerID={}, recordID={}", level = LogMessage.Level.WARN)
+   void duplicateNodeStoreID(String queue, String serverId, long recordID, Exception trace);
 }

artemis-server/src/main/java/org/apache/activemq/artemis/core/paging/cursor/impl/PageSubscriptionImpl.java

@@ -1452,6 +1452,11 @@ public final class PageSubscriptionImpl implements PageSubscription {
 
       @Override
       public void remove() {
+         removeLastElement();
+      }
+
+      @Override
+      public PagedReference removeLastElement() {
          PagedReference delivery = currentDelivery;
          if (delivery != null) {
             PageCursorInfo info = PageSubscriptionImpl.this.getPageInfo(delivery.getPagedMessage().getPageNumber());
@@ -1459,6 +1464,7 @@ public final class PageSubscriptionImpl implements PageSubscription {
                info.remove(delivery.getPagedMessage().getMessageNumber());
             }
          }
+         return delivery;
       }
 
       @Override

artemis-server/src/main/java/org/apache/activemq/artemis/core/server/Queue.java

@@ -315,8 +315,6 @@ public interface Queue extends Bindable,CriticalComponent {
 
    MessageReference removeReferenceWithID(long id) throws Exception;
 
-   MessageReference getReference(long id) throws ActiveMQException;
-
    int deleteAllReferences() throws Exception;
 
    int deleteAllReferences(int flushLimit) throws Exception;

artemis-server/src/main/java/org/apache/activemq/artemis/core/server/impl/QueueImpl.java

@@ -114,7 +114,6 @@ import org.apache.activemq.artemis.utils.ReusableLatch;
 import org.apache.activemq.artemis.utils.SizeAwareMetric;
 import org.apache.activemq.artemis.utils.actors.ArtemisExecutor;
 import org.apache.activemq.artemis.utils.collections.ConcurrentHashSet;
-import org.apache.activemq.artemis.utils.collections.NodeStore;
 import org.apache.activemq.artemis.utils.collections.LinkedListIterator;
 import org.apache.activemq.artemis.utils.collections.NodeStoreFactory;
 import org.apache.activemq.artemis.utils.collections.PriorityLinkedList;
@@ -218,12 +217,12 @@ public class QueueImpl extends CriticalComponentImpl implements Queue {
    // This is where messages are stored
    protected final PriorityLinkedList<MessageReference> messageReferences = new PriorityLinkedListImpl<>(QueueImpl.NUM_PRIORITIES, MessageReferenceImpl.getSequenceComparator());
 
-   private NodeStore<MessageReference> nodeStore;
+   private NodeStoreFactory<MessageReference> nodeStoreFactory;
 
    private void checkIDSupplier(NodeStoreFactory<MessageReference> nodeStoreFactory) {
-      if (this.nodeStore == null) {
+      if (this.nodeStoreFactory == null) {
-         this.nodeStore = nodeStoreFactory.newNodeStore();
+         this.nodeStoreFactory = nodeStoreFactory;
-         messageReferences.setNodeStore(nodeStore);
+         messageReferences.setNodeStore( () -> nodeStoreFactory.newNodeStore().setName(String.valueOf(name)));
       }
    }
 
@@ -1816,22 +1815,6 @@ public class QueueImpl extends CriticalComponentImpl implements Queue {
       }
    }
 
-   @Override
-   public synchronized MessageReference getReference(final long id1) throws ActiveMQException {
-      try (LinkedListIterator<MessageReference> iterator = iterator()) {
-
-         while (iterator.hasNext()) {
-            MessageReference ref = iterator.next();
-
-            if (ref.getMessage().getMessageID() == id1) {
-               return ref;
-            }
-         }
-
-         return null;
-      }
-   }
-
    @Override
    public long getMessageCount() {
       if (pageSubscription != null) {
@@ -3070,6 +3053,11 @@ public class QueueImpl extends CriticalComponentImpl implements Queue {
    }
 
    private int getPriority(MessageReference ref) {
+      if (isInternalQueue()) {
+         // if it's an internal queue we need to send the events on their original ordering
+         // for example an ACK arriving before the send on a Mirror..
+         return 4;
+      }
       try {
          return ref.getMessage().getPriority();
       } catch (Throwable e) {
@@ -4539,6 +4527,13 @@ public class QueueImpl extends CriticalComponentImpl implements Queue {
          }
       }
 
+      @Override
+      public MessageReference removeLastElement() {
+         synchronized (QueueImpl.this) {
+            return iter.removeLastElement();
+         }
+      }
+
       @Override
       public void remove() {
          synchronized (QueueImpl.this) {
@@ -4561,7 +4556,7 @@ public class QueueImpl extends CriticalComponentImpl implements Queue {
          return pagingIterator;
       }
 
-      Iterator<? extends MessageReference> lastIterator = null;
+      LinkedListIterator<? extends MessageReference> lastIterator = null;
 
       MessageReference cachedNext = null;
       HashSet<PagePosition> previouslyBrowsed = new HashSet<>();
@@ -4663,6 +4658,15 @@ public class QueueImpl extends CriticalComponentImpl implements Queue {
          }
       }
 
+      @Override
+      public MessageReference removeLastElement() {
+         if (lastIterator != null) {
+            return lastIterator.removeLastElement();
+         } else {
+            return null;
+         }
+      }
+
       @Override
       public void repeat() {
       }

artemis-server/src/test/java/org/apache/activemq/artemis/core/list/PriorityLinkedListTest.java

@@ -18,23 +18,33 @@ package org.apache.activemq.artemis.core.list;
 
 import static org.junit.jupiter.api.Assertions.assertEquals;
 import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
 import static org.junit.jupiter.api.Assertions.assertNull;
+import static org.junit.jupiter.api.Assertions.assertSame;
 import static org.junit.jupiter.api.Assertions.assertTrue;
 
+import java.lang.invoke.MethodHandles;
+import java.util.ArrayList;
+import java.util.HashMap;
 import java.util.HashSet;
 import java.util.Iterator;
 import java.util.Objects;
 
 import io.netty.util.collection.LongObjectHashMap;
+import org.apache.activemq.artemis.utils.RandomUtil;
 import org.apache.activemq.artemis.utils.collections.NodeStore;
 import org.apache.activemq.artemis.utils.collections.LinkedListImpl;
 import org.apache.activemq.artemis.utils.collections.LinkedListIterator;
 import org.apache.activemq.artemis.utils.collections.PriorityLinkedListImpl;
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 public final class PriorityLinkedListTest {
 
+   private static final Logger logger = LoggerFactory.getLogger(MethodHandles.lookup().lookupClass());
+
    protected Wibble a;
 
    protected Wibble b;
@@ -89,8 +99,18 @@ public final class PriorityLinkedListTest {
 
    private PriorityLinkedListImpl<Wibble> list;
 
-   protected PriorityLinkedListImpl<Wibble> getList() {
+   int lastRemovedLevel;
-      return new PriorityLinkedListImpl<>(10);
+   Wibble lastRemovedWibble;
+
+   private PriorityLinkedListImpl<Wibble> getList() {
+      return new PriorityLinkedListImpl<>(10) {
+         @Override
+         protected void removed(int level, Wibble element) {
+            super.removed(level, element);
+            lastRemovedWibble = element;
+            lastRemovedLevel = level;
+         }
+      };
    }
 
    @BeforeEach
@@ -916,36 +936,7 @@ public final class PriorityLinkedListTest {
          list.addHead(new Wibble("" + i, i), i % 10);
       }
 
-      class WibbleNodeStore implements NodeStore<Wibble> {
+      list.setNodeStore(WibbleNodeStore::new);
-         LongObjectHashMap<LinkedListImpl.Node<Wibble>> list = new LongObjectHashMap<>();
-
-         @Override
-         public void storeNode(Wibble element, LinkedListImpl.Node<Wibble> node) {
-            list.put(element.id, node);
-         }
-
-         @Override
-         public LinkedListImpl.Node<Wibble> getNode(String listID, long id) {
-            return list.get(id);
-         }
-
-         @Override
-         public void removeNode(Wibble element, LinkedListImpl.Node<Wibble> node) {
-            list.remove(element.id);
-         }
-
-         @Override
-         public void clear() {
-            list.clear();
-         }
-
-         @Override
-         public int size() {
-            return list.size();
-         }
-      }
-
-      list.setNodeStore(new WibbleNodeStore());
 
       // remove every 3rd
       for (int i = 3; i <= 3000; i += 3) {
@@ -975,19 +966,65 @@ public final class PriorityLinkedListTest {
 
    }
 
+   @Test
+   public void testRemoveWithRandomOrderID() {
+
+      list.setNodeStore(WibbleNodeStore::new);
+
+      ArrayList<Integer> usedIds = new ArrayList<>();
+
+      int elements = 50;
+
+      for (int i = 1; i <= elements; i++) {
+         int level = RandomUtil.randomInterval(0, 2);
+         list.addTail(new Wibble("" + i, i, level), level);
+         usedIds.add(i);
+      }
+
+      HashMap<Integer, Wibble> hashMapOutput = new HashMap<>(elements);
+
+      while (usedIds.size() > 0) {
+         Integer idToRemove = usedIds.remove(RandomUtil.randomInterval(0, usedIds.size() - 1));
+         Wibble wibble = list.removeWithID("", idToRemove);
+         assertNotNull(wibble);
+         assertEquals(idToRemove.intValue(), wibble.id);
+         assertSame(wibble, lastRemovedWibble);
+         // removing from the wrong could create a mess in the linked list nodes
+         assertEquals(wibble.level, lastRemovedLevel);
+         hashMapOutput.put(idToRemove, wibble);
+      }
+
+      assertEquals(elements, hashMapOutput.size());
+
+      for (int i = 1; i <= elements; i++) {
+         Wibble wibble = hashMapOutput.remove(i);
+         assertNotNull(wibble);
+         assertEquals(i, wibble.id);
+      }
+
+      assertEquals(0, hashMapOutput.size());
+   }
+
    static class Wibble {
 
       String s1;
       long id;
 
+      int level;
+
       Wibble(final String s, long id) {
+         this(s, id, 4);
+      }
+
+      Wibble(final String s, long id, int level) {
          this.s1 = s;
          this.id = id;
+         this.level = level;
       }
 
       @Override
       public String toString() {
-         return s1;
+         return "s = " + s1 + ", id = " + id + ", level = " + level;
       }
 
       @Override
@@ -1006,4 +1043,34 @@ public final class PriorityLinkedListTest {
       }
    }
 
+   class WibbleNodeStore implements NodeStore<Wibble> {
+      LongObjectHashMap<LinkedListImpl.Node<Wibble>> list = new LongObjectHashMap<>();
+
+      @Override
+      public void storeNode(Wibble element, LinkedListImpl.Node<Wibble> node) {
+         list.put(element.id, node);
+      }
+
+      @Override
+      public LinkedListImpl.Node<Wibble> getNode(String listID, long id) {
+         return list.get(id);
+      }
+
+      @Override
+      public void removeNode(Wibble element, LinkedListImpl.Node<Wibble> node) {
+         list.remove(element.id);
+      }
+
+      @Override
+      public void clear() {
+         list.clear();
+      }
+
+      @Override
+      public int size() {
+         return list.size();
+      }
+   }
+
+
 }

artemis-server/src/test/java/org/apache/activemq/artemis/core/server/impl/RoutingContextTest.java

@@ -621,11 +621,6 @@ public class RoutingContextTest {
          return null;
       }
 
-      @Override
-      public MessageReference getReference(long id) throws ActiveMQException {
-         return null;
-      }
-
       @Override
       public int deleteAllReferences() throws Exception {
          return 0;

artemis-server/src/test/java/org/apache/activemq/artemis/core/server/impl/ScheduledDeliveryHandlerTest.java

@@ -1387,11 +1387,6 @@ public class ScheduledDeliveryHandlerTest {
          return null;
       }
 
-      @Override
-      public MessageReference getReference(long id) {
-         return null;
-      }
-
       @Override
       public int deleteAllReferences() throws Exception {
          return 0;

tests/artemis-test-support/src/main/java/org/apache/activemq/artemis/tests/unit/core/postoffice/impl/fakes/FakeQueue.java

@@ -709,12 +709,6 @@ public class FakeQueue extends CriticalComponentImpl implements Queue {
       return id;
    }
 
-   @Override
-   public MessageReference getReference(final long id1) {
-      // no-op
-      return null;
-   }
-
    @Override
    public int getScheduledCount() {
       // no-op

tests/soak-tests/src/test/java/org/apache/activemq/artemis/tests/soak/brokerConnection/mirror/AccumulatedInPageSoakTest.java

@@ -37,6 +37,7 @@ import org.apache.activemq.artemis.api.core.management.SimpleManagement;
 import org.apache.activemq.artemis.core.config.amqpBrokerConnectivity.AMQPBrokerConnectionAddressType;
 import org.apache.activemq.artemis.tests.soak.SoakTestBase;
 import org.apache.activemq.artemis.tests.util.CFUtil;
+import org.apache.activemq.artemis.tests.util.RandomUtil;
 import org.apache.activemq.artemis.util.ServerUtil;
 import org.apache.activemq.artemis.utils.Wait;
 import org.apache.activemq.artemis.utils.cli.helper.HelperCreate;
@@ -174,6 +175,8 @@ public class AccumulatedInPageSoakTest extends SoakTestBase {
          MessageProducer producer = session.createProducer(queue);
 
          for (int i = 0; i < numberOfMessages; i++) {
+            // This is to reproduce ARTEMIS-5038
+            producer.setPriority(RandomUtil.randomInterval(0, 9));
             producer.send(session.createTextMessage(body));
             if (i > 0 && i % commitInterval == 0) {
                logger.info("Sent {}", i);
@@ -189,6 +192,8 @@ public class AccumulatedInPageSoakTest extends SoakTestBase {
       startDC2();
       Wait.assertEquals(0L, () -> getMessageCount(simpleManagementDC1A, SNF_QUEUE), 240_000, 500);
       Wait.assertEquals(0L, () -> getMessageCount(simpleManagementDC2A, QUEUE_NAME), 60_000, 500);
+      LogAssert.assertServerLogsForMirror(getFileServerLocation(DC2_NODE_A));
+      LogAssert.assertServerLogsForMirror(getFileServerLocation(DC1_NODE_A));
 
    }
 

tests/soak-tests/src/test/java/org/apache/activemq/artemis/tests/soak/brokerConnection/mirror/LogAssert.java

@@ -0,0 +1,31 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.activemq.artemis.tests.soak.brokerConnection.mirror;
+
+import java.io.File;
+
+import org.apache.activemq.artemis.utils.FileUtil;
+
+public class LogAssert {
+
+   public static void assertServerLogsForMirror(File serverLocation) throws Exception {
+      File log = new File(serverLocation, "log/artemis.log");
+      FileUtil.find(log, l -> l.contains("NullPointerException") || l.contains("AMQ111010"));
+   }
+
+}

tests/unit-tests/src/test/java/org/apache/activemq/artemis/tests/unit/core/server/impl/QueueImplTest.java

@@ -1218,32 +1218,6 @@ public class QueueImplTest extends ActiveMQTestBase {
       assertEquals(getMessagesAdded(queue), 3);
    }
 
-   @Test
-   public void testGetReference() throws Exception {
-      QueueImpl queue = getTemporaryQueue();
-      MessageReference messageReference = generateReference(queue, 1);
-      MessageReference messageReference2 = generateReference(queue, 2);
-      MessageReference messageReference3 = generateReference(queue, 3);
-      queue.addHead(messageReference, false);
-      queue.addHead(messageReference2, false);
-      queue.addHead(messageReference3, false);
-      assertEquals(queue.getReference(2), messageReference2);
-
-   }
-
-   @Test
-   public void testGetNonExistentReference() throws Exception {
-      QueueImpl queue = getTemporaryQueue();
-      MessageReference messageReference = generateReference(queue, 1);
-      MessageReference messageReference2 = generateReference(queue, 2);
-      MessageReference messageReference3 = generateReference(queue, 3);
-      queue.addHead(messageReference, false);
-      queue.addHead(messageReference2, false);
-      queue.addHead(messageReference3, false);
-      assertNull(queue.getReference(5));
-
-   }
-
    /**
     * Test the paused and resumed states with async deliveries.
     *