This closes #1011

artemis-protocols/artemis-mqtt-protocol/src/main/java/org/apache/activemq/artemis/core/protocol/mqtt/MQTTConnectionManager.java

@@ -17,9 +17,12 @@
 
 package org.apache.activemq.artemis.core.protocol.mqtt;
 
+import java.nio.charset.Charset;
 import java.util.Set;
 import java.util.UUID;
 
+import io.netty.buffer.ByteBuf;
+import io.netty.buffer.ByteBufAllocator;
 import io.netty.handler.codec.mqtt.MqttConnectReturnCode;
 import org.apache.activemq.artemis.api.core.client.ActiveMQClient;
 import org.apache.activemq.artemis.core.server.ActiveMQServer;
@@ -75,7 +78,10 @@ public class MQTTConnectionManager {
       session.setIsClean(cleanSession);
 
       if (will) {
-         ServerMessage w = MQTTUtil.createServerMessageFromString(session, willMessage, willTopic, willQosLevel, willRetain);
+         byte[] payload = willMessage.getBytes(Charset.forName("UTF-8"));
+         ByteBuf buf = ByteBufAllocator.DEFAULT.buffer(payload.length);
+         buf.writeBytes(payload);
+         ServerMessage w = MQTTUtil.createServerMessageFromByteBuf(session, willTopic, willRetain, willQosLevel, buf);
          session.getSessionState().setWillMessage(w);
       }
 
@@ -113,38 +119,37 @@ public class MQTTConnectionManager {
       return (ServerSessionImpl) serverSession;
    }
 
-   void disconnect() {
+   synchronized void disconnect() {
       if (session == null) {
          return;
       }
+
       try {
-         if (session.getSessionState() != null) {
+         session.stop();
-            String clientId = session.getSessionState().getClientId();
+         session.getConnection().destroy();
-            if (clientId != null)
-               CONNECTED_CLIENTS.remove(clientId);
 
          if (session.getState().isWill()) {
             session.getConnectionManager().sendWill();
          }
-         }
-         session.stop();
-         session.getConnection().disconnect(false);
-         session.getConnection().destroy();
       } catch (Exception e) {
-         /* FIXME Failure during disconnect would leave the session state in an unrecoverable state.  We should handle
-         errors more gracefully.
-          */
          log.error("Error disconnecting client: " + e.getMessage());
+      } finally {
+         if (session.getSessionState() != null) {
+            session.getSessionState().setAttached(false);
+            String clientId = session.getSessionState().getClientId();
+            if (clientId != null) {
+               CONNECTED_CLIENTS.remove(clientId);
+            }
+         }
       }
    }
 
    private void sendWill() throws Exception {
-      session.getServerSession().send(session.getSessionState().getWillMessage(), true);
+      session.getServer().getPostOffice().route(session.getSessionState().getWillMessage(), true);
       session.getSessionState().deleteWillMessage();
    }
 
    private MQTTSessionState getSessionState(String clientId) throws InterruptedException {
-      synchronized (MQTTSession.SESSIONS) {
       /* [MQTT-3.1.2-6] If CleanSession is set to 1, the Client and Server MUST discard any previous Session and
        * start a new one  This Session lasts as long as the Network Connection. State data associated with this Session
        * MUST NOT be reused in any subsequent Session */
@@ -153,10 +158,6 @@ public class MQTTConnectionManager {
       a new one. */
       MQTTSessionState state = MQTTSession.SESSIONS.get(clientId);
       if (state != null) {
-            // TODO Add a count down latch for handling wait during attached session state.
-            while (state.getAttached()) {
-               Thread.sleep(1000);
-            }
          return state;
       } else {
          state = new MQTTSessionState(clientId);
@@ -164,7 +165,6 @@ public class MQTTConnectionManager {
          return state;
       }
    }
-   }
 
    private String validateClientId(String clientId, boolean cleanSession) {
       if (clientId == null || clientId.isEmpty()) {

artemis-protocols/artemis-mqtt-protocol/src/main/java/org/apache/activemq/artemis/core/protocol/mqtt/MQTTUtil.java

@@ -115,7 +115,6 @@ public class MQTTUtil {
       message.setAddress(address);
       message.putBooleanProperty(new SimpleString(MQTT_MESSAGE_RETAIN_KEY), retain);
       message.putIntProperty(new SimpleString(MQTT_QOS_LEVEL_KEY), qos);
-      // For JMS Consumption
       message.setType(Message.BYTES_TYPE);
       return message;
    }
@@ -133,16 +132,6 @@ public class MQTTUtil {
       return message;
    }
 
-   public static ServerMessage createServerMessageFromString(MQTTSession session,
-                                                             String payload,
-                                                             String topic,
-                                                             int qos,
-                                                             boolean retain) {
-      ServerMessage message = createServerMessage(session, new SimpleString(topic), retain, qos);
-      message.getBodyBuffer().writeString(payload);
-      return message;
-   }
-
    public static ServerMessage createPubRelMessage(MQTTSession session, SimpleString address, int messageId) {
       ServerMessage message = createServerMessage(session, address, false, 1);
       message.putIntProperty(new SimpleString(MQTTUtil.MQTT_MESSAGE_ID_KEY), messageId);

tests/integration-tests/src/test/java/org/apache/activemq/artemis/tests/integration/mqtt/imported/MQTTTest.java

@@ -45,6 +45,7 @@ import org.apache.activemq.artemis.core.server.impl.AddressInfo;
 import org.apache.activemq.artemis.tests.util.Wait;
 import org.fusesource.mqtt.client.BlockingConnection;
 import org.fusesource.mqtt.client.MQTT;
+import org.fusesource.mqtt.client.MQTTException;
 import org.fusesource.mqtt.client.Message;
 import org.fusesource.mqtt.client.QoS;
 import org.fusesource.mqtt.client.Topic;
@@ -997,6 +998,39 @@ public class MQTTTest extends MQTTTestSupport {
       newConnection.disconnect();
    }
 
+   @Test(timeout = 60 * 1000)
+   public void testClientConnectionFailureSendsWillMessage() throws Exception {
+      getServer().createQueue(SimpleString.toSimpleString("will"), RoutingType.MULTICAST, SimpleString.toSimpleString("will"), null, true, false);
+
+      MQTT mqtt = createMQTTConnection("1", false);
+      mqtt.setKeepAlive((short) 1);
+      mqtt.setWillMessage("test message");
+      mqtt.setWillTopic("will");
+      mqtt.setWillQos(QoS.AT_LEAST_ONCE);
+
+      final BlockingConnection connection = mqtt.blockingConnection();
+      connection.connect();
+      Wait.waitFor(new Wait.Condition() {
+         @Override
+         public boolean isSatisfied() throws Exception {
+            return connection.isConnected();
+         }
+      });
+
+      MQTT mqtt2 = createMQTTConnection("2", false);
+      BlockingConnection connection2 = mqtt2.blockingConnection();
+      connection2.connect();
+      connection2.subscribe(new Topic[]{new Topic("will", QoS.AT_LEAST_ONCE)});
+
+      // kill transport
+      connection.kill();
+
+      // FIXME Wait for the previous connection to timeout.  This is not required in ActiveMQ.  Needs investigating.
+      Thread.sleep(10000);
+      Message m = connection2.receive(1000, TimeUnit.MILLISECONDS);
+      assertEquals("test message", new String(m.getPayload()));
+   }
+
    @Test(timeout = 60 * 1000)
    public void testCleanSession() throws Exception {
       final String CLIENTID = "cleansession";
@@ -1779,4 +1813,22 @@ public class MQTTTest extends MQTTTestSupport {
       Message message = connection2.receive();
       assertEquals(payload, new String(message.getPayload()));
    }
+
+   @Test
+   public void testDuplicateIDReturnsError() throws Exception {
+      String clientId = "clientId";
+      MQTT mqtt = createMQTTConnection();
+      mqtt.setClientId(clientId);
+      mqtt.blockingConnection().connect();
+
+      MQTTException e = null;
+      try {
+         MQTT mqtt2 = createMQTTConnection();
+         mqtt2.setClientId(clientId);
+         mqtt2.blockingConnection().connect();
+      } catch (MQTTException mqttE) {
+         e = mqttE;
+      }
+      assertTrue(e.getMessage().contains("CONNECTION_REFUSED_IDENTIFIER_REJECTED"));
+   }
 }