Claus Ibsen created CAMEL-25969:
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Summary: camel-stub - without a consumer the stub queue fills up,
and the producer fails with Queue full after 1000 messages
Key: CAMEL-25969
URL: https://issues.apache.org/jira/browse/CAMEL-25969
Project: Camel
Issue Type: Bug
Components: camel-core
Affects Versions: 4.18.0, 4.22.0, 4.23.0
Reporter: Claus Ibsen
Fix For: 4.24.0
With no route that consumes from it, a stub endpoint keeps every message in its
queue. {{StubProducer}} sends the exchange InOnly when there are no consumers
(main e6885df7894d, lines 46-49), and the seda producer it extends queues it.
The queue is never drained. After 1000 messages, the default size, the producer
fails with {{IllegalStateException: Queue full}}, because blockWhenFull and
discardWhenFull are false (SedaProducer, line 315).
That is the common case of {{camel run --stub}}: a stubbed producer such as
{{to: jms:queue:orders}} has no consumer, so a route that sends more than 1000
messages fails, and every message is kept in memory until then.
Checked on 4.24.0-SNAPSHOT with {{camel run}}: a loop that sends 1001 messages
to {{stub:nobody}} fails with {{IllegalStateException: Queue full}}.
*Proposed change*: when the stub endpoint has no consumer, drop the message
after it is sent, or keep only a bounded number of them for browsing.
_Claude Code on behalf of davsclaus_
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