Claus Ibsen created CAMEL-26153:
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Summary: camel-hivemq - the producer publishes a Map, POJO or
number body as an empty payload, so the data is lost silently
Key: CAMEL-26153
URL: https://issues.apache.org/jira/browse/CAMEL-26153
Project: Camel
Issue Type: Bug
Reporter: Claus Ibsen
Fix For: 4.24.0
Found while adding the catalog body types of rocketmq, hivemq, iggy and
kafka-share (CAMEL-24961, PR #28394).
h4. 1. A body that does not convert to byte[] is published as an empty payload
{{HiveMQProducer.process}} (main 2a465aa4814c, line 69) reads the body with the
non-mandatory {{getBody(byte[].class)}} and replaces null with {{new byte[0]}}
(line 71). A {{Map}}, a POJO or an {{Integer}} body has no converter to
{{byte[]}}, so it is published as an empty message without any error or log,
and the data is lost. camel-paho fails the exchange for the same bodies.
Checked on 4.24.0-SNAPSHOT with hivemq-ce 2026.5 in Docker (MQTT 5 and 3.1.1).
Proposed: use {{getMandatoryBody(byte[].class)}} when the body is not null, and
keep the empty payload only for a null body.
_Claude Code on behalf of davsclaus_
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