Pedro Marques created AMQ-4585:
----------------------------------
Summary: MQTT BlockingConnection.receive fails when receiving
pending messages after reconnect without cleaning session
Key: AMQ-4585
URL: https://issues.apache.org/jira/browse/AMQ-4585
Project: ActiveMQ
Issue Type: Bug
Affects Versions: 5.8.0
Reporter: Pedro Marques
The system throws at least three different types of exceptions when a
subscriber receives the first pending message without cleaning the session. The
test case corresponds to receiving several messages from a publisher then
closing the subscriber connection and finally reconnecting with
setCleanSession(false) and attempt to read the messages published while the
subscriber was disconnected.
The exceptions thrown:
{code}
java.net.ProtocolException: Command from server contained an invalid message
id: 1
at
org.fusesource.mqtt.client.CallbackConnection.completeRequest(CallbackConnection.java:723)
at
org.fusesource.mqtt.client.CallbackConnection.processFrame(CallbackConnection.java:762)
at
org.fusesource.mqtt.client.CallbackConnection.access$1500(CallbackConnection.java:51)
at
org.fusesource.mqtt.client.CallbackConnection$6.onTransportCommand(CallbackConnection.java:392)
at
org.fusesource.hawtdispatch.transport.TcpTransport.drainInbound(TcpTransport.java:659)
at
org.fusesource.hawtdispatch.transport.SslTransport.drainInbound(SslTransport.java:264)
at
org.fusesource.hawtdispatch.transport.TcpTransport$6.run(TcpTransport.java:538)
at
org.fusesource.hawtdispatch.internal.NioDispatchSource$3.run(NioDispatchSource.java:209)
at
org.fusesource.hawtdispatch.internal.SerialDispatchQueue.run(SerialDispatchQueue.java:100)
at
org.fusesource.hawtdispatch.internal.pool.SimpleThread.run(SimpleThread.java:77)
{code}
{code}
java.lang.ArrayIndexOutOfBoundsException: 0
at
org.fusesource.mqtt.codec.MessageSupport$AckBase.decode(MessageSupport.java:81)
at org.fusesource.mqtt.codec.PUBREC.decode(PUBREC.java:40)
at
org.fusesource.mqtt.client.CallbackConnection.processFrame(CallbackConnection.java:749)
at
org.fusesource.mqtt.client.CallbackConnection.access$1500(CallbackConnection.java:51)
at
org.fusesource.mqtt.client.CallbackConnection$6.onTransportCommand(CallbackConnection.java:392)
at
org.fusesource.hawtdispatch.transport.TcpTransport.drainInbound(TcpTransport.java:659)
at
org.fusesource.hawtdispatch.transport.SslTransport.drainInbound(SslTransport.java:264)
at
org.fusesource.hawtdispatch.transport.TcpTransport$6.run(TcpTransport.java:538)
at
org.fusesource.hawtdispatch.internal.NioDispatchSource$3.run(NioDispatchSource.java:209)
at
org.fusesource.hawtdispatch.internal.SerialDispatchQueue.run(SerialDispatchQueue.java:100)
at
org.fusesource.hawtdispatch.internal.pool.SimpleThread.run(SimpleThread.java:77)
{code}
{code}
java.net.ProtocolException: Unexpected MQTT command type: 0
at
org.fusesource.mqtt.client.CallbackConnection.processFrame(CallbackConnection.java:775)
at
org.fusesource.mqtt.client.CallbackConnection.access$1500(CallbackConnection.java:51)
at
org.fusesource.mqtt.client.CallbackConnection$6.onTransportCommand(CallbackConnection.java:392)
at
org.fusesource.hawtdispatch.transport.TcpTransport.drainInbound(TcpTransport.java:659)
at
org.fusesource.hawtdispatch.transport.SslTransport.drainInbound(SslTransport.java:264)
at
org.fusesource.hawtdispatch.transport.TcpTransport$6.run(TcpTransport.java:538)
at
org.fusesource.hawtdispatch.internal.NioDispatchSource$3.run(NioDispatchSource.java:209)
at
org.fusesource.hawtdispatch.internal.SerialDispatchQueue.run(SerialDispatchQueue.java:100)
at
org.fusesource.hawtdispatch.internal.pool.SimpleThread.run(SimpleThread.java:77)
{code}
The problem doesn't occur always but most of the times the first reconnection
attempt is made. With setCleanSession(true) the system works fine.
Code sample (publisher, permanently running):
{code}
MQTT mqtt = new MQTT();
mqtt.setHost(url);
mqtt.setUserName(user);
mqtt.setPassword(password);
mqtt.setClientId("test_id");
int i = 0;
while (true) {
BlockingConnection connection = mqtt.blockingConnection();
connection.connect();
String message = "TestMessage: " + i;
connection.publish("TopicA", message.getBytes(), QoS.AT_LEAST_ONCE,
false);
System.out.println("Vendor: Sent message.");
Thread.sleep(2500);
connection.disconnect();
Thread.sleep(2500);
i++;
}
{code}
Code sample (subscriber, fails multiple times when restarting after the
connection is closed):
{code}
try {
MQTT = new MQTT();
mqtt.setHost(url);
mqtt.setClientId(clientId);
mqtt.setUserName(user);
mqtt.setPassword(password);
mqtt.setCleanSession(false);
BlockingConnection connection = mqtt.blockingConnection();
connection.connect();
Topic[] topics = {new Topic("TopicA", QoS.EXACTLY_ONCE)};
byte[] qoses = connection.subscribe(topics);
int numMessages = 1;
while (numMessages % 10 != 0) {
Message message = connection.receive();
byte[] payload = message.getPayload();
String messageContent = new String(payload);
System.out.println("Received message from topic: " + message.getTopic()
+ " Message content: " + messageContent);
message.ack();
numMessages++;
}
} finally {
if(connection != null) {
try {
connection.disconnect();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
{code}
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