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https://issues.apache.org/jira/browse/CAMEL-25113?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Claus Ibsen resolved CAMEL-25113.
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Resolution: Fixed
Fixed by https://github.com/apache/camel/pull/27019
> camel-core - onException configuration: fix bugs found in a deep review
> -----------------------------------------------------------------------
>
> Key: CAMEL-25113
> URL: https://issues.apache.org/jira/browse/CAMEL-25113
> Project: Camel
> Issue Type: Bug
> Components: camel-core
> Reporter: Claus Ibsen
> Assignee: Claus Ibsen
> Priority: Minor
> Fix For: 4.23.0
>
>
> A review of the onException configuration found these bugs:
> # The {{onWhen}} predicate of {{onException}} is not created when the route
> is created (unlike {{handled}}, {{continued}}, {{retryWhile}} and the onWhen
> of other EIPs), but evaluated from the model at runtime. So property
> placeholders of route templates in the onWhen fail at runtime ({{Property
> with key [code] not found}}), and an invalid onWhen expression is not
> detected when the route is created but only when an exception is thrown.
> # An {{onException}} that is only configured with {{redeliveryPolicyRef}} (or
> {{onExceptionOccurredRef}}) fails with {{is not configured}} (CAMEL-11080
> only fixed this for the redeliveryPolicy object).
> # A class name in {{onException}} that is not an exception (such as
> {{java.lang.String}} in XML/YAML) is accepted and never matches; it now fails
> when the route is created.
> Documentation:
> * How Camel selects the onException is described as "first match starting
> from the bottom (nested caused by)", but Camel selects the closest match
> across the thrown exception and all its causes (and the most nested one when
> equally close), a route scoped onException wins over a context scoped when
> equally close, and when the same exception is configured more than once the
> last one is used (and the ones from route configurations are added after the
> ones in the RouteBuilder).
> * When any redelivery option is configured on an onException, its redelivery
> policy is based on the error handler (and uses its maximumRedeliveries).
> _Claude Code on behalf of Claus Ibsen_
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