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https://issues.apache.org/jira/browse/CAMEL-24707?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Claus Ibsen resolved CAMEL-24707.
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Resolution: Fixed
> camel-yaml-dsl - the JSON schema should mark the expression required on the
> expression nodes (split, filter, setBody, ...)
> --------------------------------------------------------------------------------------------------------------------------
>
> Key: CAMEL-24707
> URL: https://issues.apache.org/jira/browse/CAMEL-24707
> Project: Camel
> Issue Type: Improvement
> Components: camel-yaml-dsl
> Reporter: Claus Ibsen
> Assignee: Claus Ibsen
> Priority: Major
> Fix For: 4.23.0
>
>
> The generated YAML DSL JSON schema (camelYamlDsl.json) leaves the expression
> optional on every expression node: each of split, filter, when, setBody,
> setHeader, setProperty, setVariable, transform, script, validate, delay,
> throttle, loop, recipientList, routingSlip, dynamicRouter, resequence,
> idempotentConsumer, enrich, pollEnrich, sort... is a oneOf of the inline
> language keys, an expression: property, or "none of them". So
> - split:
> delimiter: ","
> steps: [...]
> validates and fails when the route is created with "Unsupported definition:
> null" (the reifier gets a null ExpressionDefinition).
> Found on 2026-09-13 while benchmarking AI-assisted route authoring: models
> write split, filter and setBody with only options and the validator, Kaoto
> and the IDE plugins accept it.
> To analyze which expression nodes require the expression and mark it required
> in the schema so every consumer of the schema benefits. First pass from the
> model classes:
> - ExpressionNode subclasses: Delay, DynamicRouter, Enrich, PollEnrich,
> RecipientList, RoutingSlip, Script, SetBody, SetHeader, SetProperty,
> SetVariable, Sort, Throttle, Transform, Validate
> - OutputExpressionNode subclasses: Filter, Split, Loop, When,
> WhenSkipSendToEndpoint, Resequence (batch config), IdempotentConsumer...
> All of them need the expression at runtime except sort (expression optional,
> defaults to the body). Loop needs it in both modes (count and doWhile).
> Enrich and pollEnrich need it as the endpoint expression. aggregate is not an
> expression node; its correlationExpression is a separate required property.
> Until the schema is fixed, camel-yaml-dsl-validator has a post-check
> (CAMEL-24698) that reports an expression node without an expression.
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