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From "Justin Bertram (JIRA)" <>
Subject [jira] [Resolved] (ARTEMIS-916) Retained messages from file system contain weird chars
Date Wed, 01 Mar 2017 16:36:45 GMT


Justin Bertram resolved ARTEMIS-916.
    Resolution: Duplicate

> Retained messages from file system contain weird chars
> ------------------------------------------------------
>                 Key: ARTEMIS-916
>                 URL:
>             Project: ActiveMQ Artemis
>          Issue Type: Bug
>          Components: MQTT
>    Affects Versions: 1.5.1
>         Environment: - Machine:
> It's an EC2 instance on AWS cloud of type m4.large: 2 vCPU, 8G RAM and SSD storage.
> - OS:
> CentOS Linux release 7.3.1611 (Core) - x86_64
> - JVM:
> java version "1.8.0_111"
> Java(TM) SE Runtime Environment (build 1.8.0_111-b14)
> Java HotSpot(TM) 64-Bit Server VM (build 25.111-b14, mixed mode)
> - Distro package version of libaio:
> Arch        : x86_64
> Version     : 0.3.109
> Release     : 13.el7
>            Reporter: Francesco Padovani
> I'm testing the "retained message" feature of MQTT protocol.
> It seems that the broker works well while the retained messages are kept in ram: messages
are sent correctly.
> But when the Broker needs to recover and send the retained messages from the file system
(e.g. after a restart), clients receive them with weird chars inside.
> Following are the steps to reproduce the behaviour:
> [Server Side]
> 1. Create a dedicated user and a folder for the Broker installation (with right permission
for that user)
> 2. Set JAVA_HOME environment variable for the above user (jdk 1.8.0_111 in my case),
download and unpack apache artemis 1.5.1.
> 3. Create a broker instance (set a username, password and role).
> 4. cd into the just created broker folder and create a user by using the following command:
> bin/artemis user add
>   --> set username = <username>
>   --> set password = <password>
>   --> set role = mqtt
> 5. Set the broker.xml file accordingly to the attached one (by changing ip and folder
> 6. Run the broker: in foreground ("bin/artemis run") or as a service (bin/artemis-service
start) it's the same.
> [Client Side]
> 7. use a mqtt client to publish a retained message on a topic. E.g. with mosquitto client
the command could be the following:
> mosquitto_pub -d -h <broker_ip> -p 1883 -u <user> -P <password> -t
/topic/test -r -q <QoS> -m "test for a retained message"
> 8. use a mqtt client to subscribe the same topic specified in the previous step. E.g.:
> mosquitto_sub -d -h <broker_ip> -p 1883 -u <user> -P <password> -q
<QoS> -t /topic/test
> receives the retained message sent in previous step. The message is good.
> [Server Side]
> 9. Stop the Broker: "bin/artemis stop" or "bin/artemis-service stop"
> 10. Wait until the Broker finishes to stop ("stopped" in the log) and then restart it:
"bin/artemis run" or "bin/artemis-service start". Check until it's up and running.
> [Client Side]
> 11. use a mqtt client to subscribe the same topic specified in step 7/8. E.g.:
> mosquitto_sub -d -h <broker_ip> -p 1883 -u <user> -P <password> -q
<QoS> -t /topic/test
> ...HERE THE ISSUE: it receives the same retained message published in step 7, but with
weird chars inside.
> 12. If you try to replicate steps 7 and 8 (publish a new retained message and subscribe
to receive it) you will notice that the new retained message comes back to be clean (no weird
> NOTE: it doesn't matter the client used for test. I replicated the same behaviour by
using mosquitto_client, mqtt-spy and mqtt.fx

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