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https://issues.apache.org/jira/browse/CAMEL-24924?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Claus Ibsen resolved CAMEL-24924.
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Fix Version/s: 4.23.0
Resolution: Fixed
The fix is merged on main, so it is in Camel 4.23.0:
* 631fa9c68708 CAMEL-24924: camel-core - Failover load balancer without
processors should complete the exchange
* ef653a377b8c CAMEL-24924: camel-core - Complete the exchange without
processors like the other load balancers do
Resolving, as the ticket was not updated when the PR was merged.
_Claude Code on behalf of Claus Ibsen_
> Failover load balancer with no processors never completes the exchange, so
> the caller hangs
> -------------------------------------------------------------------------------------------
>
> Key: CAMEL-24924
> URL: https://issues.apache.org/jira/browse/CAMEL-24924
> Project: Camel
> Issue Type: Bug
> Components: camel-core
> Reporter: shashank
> Priority: Minor
> Fix For: 4.23.0
>
>
> A route with a failover load balancer that has no outputs starts without any
> error, but every exchange sent to it hangs:
> {code:java}
> from("direct:fo0").loadBalance().failover().end().setBody(constant("after"));
> from("direct:forr0").loadBalance().failover(-1, false,
> true).end().setBody(constant("after"));
> {code}
> {{template.requestBody("direct:fo0", "x")}} never returns. Nothing is logged
> and no exception is set on the exchange. The same route with {{roundRobin()}}
> instead of {{failover()}} returns straight away and continues with the next
> step.
> Cause: {{FailOverLoadBalancer.State.run()}} assumes there is at least one
> processor. In the default mode it reaches "no more processors to try" and
> calls {{ExchangeHelper.copyResults(exchange, copy)}} with {{copy == null}},
> which throws a {{NullPointerException}}. In round robin or sticky mode it
> calls {{processors[0]}} on an empty array
> ({{ArrayIndexOutOfBoundsException}}). Both happen inside a task on the
> reactive executor, before {{callback.done}} is called, so the exchange is
> never completed.
> Proposed fix: when there are no processors, complete the exchange straight
> away ({{callback.done(true)}}), as {{QueueLoadBalancer}} and
> {{TopicLoadBalancer}} already do.
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