This closes #3201

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

@@ -3992,11 +3992,19 @@ public class ActiveMQServerImpl implements ActiveMQServer {
          addressSettingsRepository.swap(configuration.getAddressesSettings().entrySet());
 
          ActiveMQServerLogger.LOGGER.reloadingConfiguration("diverts");
+         final Set<SimpleString> divertsToRemove = postOffice.getAllBindings().values().stream()
+                 .filter(binding -> binding instanceof DivertBinding)
+                 .map(Binding::getUniqueName)
+                 .collect(Collectors.toSet());
          for (DivertConfiguration divertConfig : configuration.getDivertConfigurations()) {
+            divertsToRemove.remove(SimpleString.toSimpleString(divertConfig.getName()));
             if (postOffice.getBinding(new SimpleString(divertConfig.getName())) == null) {
                deployDivert(divertConfig);
             }
          }
+         for (final SimpleString divertName : divertsToRemove) {
+            destroyDivert(divertName);
+         }
 
          ActiveMQServerLogger.LOGGER.reloadingConfiguration("addresses");
          undeployAddressesAndQueueNotInConfiguration(configuration);

docs/user-manual/en/config-reload.md

@@ -161,10 +161,7 @@ and several sub-elements that defines the properties of a divert.
 
 > **Note:**
 >
-> Reloading `<diverts>` only resulting in deploying new diverts. Existing diverts
+> Existing diverts get undeployed if you delete their `<divert>` element.
-> won’t get undeployed even if you delete a `<divert>` element. Nor an existing
-> divert will be updated if its element is updated after reloading.  To make
-> this happen you need a restart of the broker.
 
 Below lists the effects of adding, deleting and updating of an
 element/attribute within the diverts element, whether a change can be done or
@@ -173,7 +170,7 @@ can’t be done.
 Operation | Add | Delete | Update
 ---|---|---|---
 `<diverts>` | X (no more than one can be present) | Deleting it means delete (undeploy) all diverts in running broker. | N/A
-`<divert>` | Adding a new divert. It will be deployed after reloading | No effect on the deployed divert.(unless restarting broker, in which case the divert will no longer be deployed) | No effect on the deployed divert (unless restarting broker, in which case the divert will be redeployed)
+`<divert>` | Adding a new divert. It will be deployed after reloading | Deleting it means the divert will be undeployed after reloading | No effect on the deployed divert (unless restarting broker, in which case the divert will be redeployed)
 attribute `name` | N/A | X | A new divert with the name will be deployed. (if it is not already there in broker). Otherwise no effect.
 `<transformer-class-name>` | X (no more than one can be present) | No effect on the deployed divert.(unless restarting broker, in which case the divert will be deployed without the transformer class) | No effect on the deployed divert.(unless restarting broker, in which case the divert has the transformer class)
 `<exclusive>` | X (no more than one can be present) | No effect on the deployed divert.(unless restarting broker) | No effect on the deployed divert.(unless restarting broker)

tests/integration-tests/src/test/java/org/apache/activemq/artemis/tests/integration/jms/RedeployTest.java

@@ -43,6 +43,7 @@ import org.apache.activemq.artemis.api.core.RoutingType;
 import org.apache.activemq.artemis.api.core.SimpleString;
 import org.apache.activemq.artemis.core.postoffice.Binding;
 import org.apache.activemq.artemis.core.postoffice.QueueBinding;
+import org.apache.activemq.artemis.core.postoffice.impl.DivertBinding;
 import org.apache.activemq.artemis.core.postoffice.impl.LocalQueueBinding;
 import org.apache.activemq.artemis.core.security.Role;
 import org.apache.activemq.artemis.core.server.cluster.impl.MessageLoadBalancingType;
@@ -52,6 +53,7 @@ import org.apache.activemq.artemis.core.server.impl.AddressInfo;
 import org.apache.activemq.artemis.core.settings.impl.AddressFullMessagePolicy;
 import org.apache.activemq.artemis.core.settings.impl.AddressSettings;
 import org.apache.activemq.artemis.jms.client.ActiveMQConnectionFactory;
+import org.apache.activemq.artemis.jms.client.ActiveMQDestination;
 import org.apache.activemq.artemis.tests.unit.core.postoffice.impl.FakeQueue;
 import org.apache.activemq.artemis.tests.util.Wait;
 import org.apache.activemq.artemis.tests.util.ActiveMQTestBase;
@@ -448,6 +450,63 @@ public class RedeployTest extends ActiveMQTestBase {
       }
    }
 
+   @Test
+   public void testUndeployDivert() throws Exception {
+
+      Path brokerXML = getTestDirfile().toPath().resolve("broker.xml");
+      URL baseConfig = RedeployTest.class.getClassLoader().getResource("reload-divert-undeploy-before.xml");
+      URL newConfig = RedeployTest.class.getClassLoader().getResource("reload-divert-undeploy-after.xml");
+      Files.copy(baseConfig.openStream(), brokerXML, StandardCopyOption.REPLACE_EXISTING);
+      EmbeddedActiveMQ embeddedActiveMQ = new EmbeddedActiveMQ();
+      embeddedActiveMQ.setConfigResourcePath(brokerXML.toUri().toString());
+      embeddedActiveMQ.start();
+
+      try {
+         DivertBinding divertBinding = (DivertBinding) embeddedActiveMQ.getActiveMQServer().getPostOffice()
+                 .getBinding(new SimpleString("divert"));
+         assertNotNull(divertBinding);
+
+         Queue sourceQueue = (Queue) ActiveMQDestination.createDestination("queue://source", ActiveMQDestination.TYPE.QUEUE);
+         Queue targetQueue = (Queue) ActiveMQDestination.createDestination("queue://target", ActiveMQDestination.TYPE.QUEUE);
+
+         try (ActiveMQConnectionFactory factory = new ActiveMQConnectionFactory();
+              Connection connection = factory.createConnection();
+              Session session = connection.createSession(Session.AUTO_ACKNOWLEDGE);
+              MessageProducer sourceProducer = session.createProducer(sourceQueue);
+              MessageConsumer sourceConsumer = session.createConsumer(sourceQueue);
+              MessageConsumer targetConsumer = session.createConsumer(targetQueue)) {
+
+            connection.start();
+            Message message = session.createTextMessage("Hello world");
+            sourceProducer.send(message);
+            assertNotNull(sourceConsumer.receive(2000));
+            assertNotNull(targetConsumer.receive(2000));
+         }
+
+         deployBrokerConfig(embeddedActiveMQ, newConfig);
+
+         divertBinding = (DivertBinding) embeddedActiveMQ.getActiveMQServer().getPostOffice()
+                 .getBinding(new SimpleString("divert"));
+         assertNull(divertBinding);
+
+         try (ActiveMQConnectionFactory factory = new ActiveMQConnectionFactory();
+              Connection connection = factory.createConnection();
+              Session session = connection.createSession(Session.AUTO_ACKNOWLEDGE);
+              MessageProducer sourceProducer = session.createProducer(sourceQueue);
+              MessageConsumer sourceConsumer = session.createConsumer(sourceQueue);
+              MessageConsumer targetConsumer = session.createConsumer(targetQueue)) {
+
+            connection.start();
+            Message message = session.createTextMessage("Hello world");
+            sourceProducer.send(message);
+            assertNotNull(sourceConsumer.receive(2000));
+            assertNull(targetConsumer.receive(2000));
+         }
+      } finally {
+         embeddedActiveMQ.stop();
+      }
+   }
+
    @Test
    public void testRedeployWithFailover() throws Exception {
       Set<Role> original = new HashSet<>();

tests/integration-tests/src/test/resources/reload-divert-undeploy-after.xml

@@ -0,0 +1,93 @@
+<?xml version='1.0'?>
+<!--
+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.
+-->
+
+<configuration xmlns="urn:activemq"
+               xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+               xsi:schemaLocation="urn:activemq /schema/artemis-configuration.xsd">
+
+   <core xmlns="urn:activemq:core">
+
+      <name>0.0.0.0</name>
+
+      <configuration-file-refresh-period>100</configuration-file-refresh-period>
+
+      <persistence-enabled>false</persistence-enabled>
+
+      <security-enabled>false</security-enabled>
+
+      <!-- this could be ASYNCIO or NIO
+       -->
+      <journal-type>NIO</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-min-files>2</journal-min-files>
+
+      <journal-pool-files>-1</journal-pool-files>
+
+      <!--
+       This value was determined through a calculation.
+       Your system could perform 25 writes per millisecond
+       on the current journal configuration.
+       That translates as a sync write every 40000 nanoseconds
+      -->
+      <journal-buffer-timeout>40000</journal-buffer-timeout>
+
+
+      <acceptors>
+         <!-- Default ActiveMQ Artemis Acceptor.  Multi-protocol adapter.  Currently supports ActiveMQ Artemis Core, OpenWire, STOMP, AMQP, MQTT, and HornetQ Core. -->
+         <!-- performance tests have shown that openWire performs best with these buffer sizes -->
+         <acceptor name="artemis">tcp://0.0.0.0:61616?tcpSendBufferSize=1048576;tcpReceiveBufferSize=1048576</acceptor>
+
+         <!-- AMQP Acceptor.  Listens on default AMQP port for AMQP traffic.-->
+         <acceptor name="amqp">tcp://0.0.0.0:5672?protocols=AMQP</acceptor>
+
+         <!-- STOMP Acceptor. -->
+         <acceptor name="stomp">tcp://0.0.0.0:61613?protocols=STOMP</acceptor>
+
+         <!-- HornetQ Compatibility Acceptor.  Enables HornetQ Core and STOMP for legacy HornetQ clients. -->
+         <acceptor name="hornetq">tcp://0.0.0.0:5445?protocols=HORNETQ,STOMP</acceptor>
+
+         <!-- MQTT Acceptor -->
+         <acceptor name="mqtt">tcp://0.0.0.0:1883?protocols=MQTT</acceptor>
+
+      </acceptors>
+
+      <addresses>
+         <address name="source">
+            <anycast>
+               <queue name="source"/>
+            </anycast>
+         </address>
+         <address name="target">
+            <multicast>
+               <queue name="target"/>
+            </multicast>
+         </address>
+      </addresses>
+
+   </core>
+</configuration>

tests/integration-tests/src/test/resources/reload-divert-undeploy-before.xml

@@ -0,0 +1,100 @@
+<?xml version='1.0'?>
+<!--
+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.
+-->
+
+<configuration xmlns="urn:activemq"
+               xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+               xsi:schemaLocation="urn:activemq /schema/artemis-configuration.xsd">
+
+   <core xmlns="urn:activemq:core">
+
+      <name>0.0.0.0</name>
+
+      <configuration-file-refresh-period>100</configuration-file-refresh-period>
+
+      <persistence-enabled>false</persistence-enabled>
+
+      <security-enabled>false</security-enabled>
+
+      <!-- this could be ASYNCIO or NIO
+       -->
+      <journal-type>NIO</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-min-files>2</journal-min-files>
+
+      <journal-pool-files>-1</journal-pool-files>
+
+      <!--
+       This value was determined through a calculation.
+       Your system could perform 25 writes per millisecond
+       on the current journal configuration.
+       That translates as a sync write every 40000 nanoseconds
+      -->
+      <journal-buffer-timeout>40000</journal-buffer-timeout>
+
+
+      <acceptors>
+         <!-- Default ActiveMQ Artemis Acceptor.  Multi-protocol adapter.  Currently supports ActiveMQ Artemis Core, OpenWire, STOMP, AMQP, MQTT, and HornetQ Core. -->
+         <!-- performance tests have shown that openWire performs best with these buffer sizes -->
+         <acceptor name="artemis">tcp://0.0.0.0:61616?tcpSendBufferSize=1048576;tcpReceiveBufferSize=1048576</acceptor>
+
+         <!-- AMQP Acceptor.  Listens on default AMQP port for AMQP traffic.-->
+         <acceptor name="amqp">tcp://0.0.0.0:5672?protocols=AMQP</acceptor>
+
+         <!-- STOMP Acceptor. -->
+         <acceptor name="stomp">tcp://0.0.0.0:61613?protocols=STOMP</acceptor>
+
+         <!-- HornetQ Compatibility Acceptor.  Enables HornetQ Core and STOMP for legacy HornetQ clients. -->
+         <acceptor name="hornetq">tcp://0.0.0.0:5445?protocols=HORNETQ,STOMP</acceptor>
+
+         <!-- MQTT Acceptor -->
+         <acceptor name="mqtt">tcp://0.0.0.0:1883?protocols=MQTT</acceptor>
+
+      </acceptors>
+
+      <addresses>
+         <address name="source">
+            <anycast>
+               <queue name="source"/>
+            </anycast>
+         </address>
+         <address name="target">
+            <multicast>
+               <queue name="target"/>
+            </multicast>
+         </address>
+      </addresses>
+
+      <diverts>
+         <divert name="divert">
+            <address>source</address>
+            <forwarding-address>target</forwarding-address>
+         </divert>
+      </diverts>
+
+   </core>
+</configuration>