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https://issues.apache.org/jira/browse/CAMEL-25402?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Claus Ibsen resolved CAMEL-25402.
---------------------------------
Resolution: Fixed
Fixed in https://github.com/apache/camel/pull/27471 (main a615186a64c6).
> camel-yaml-dsl-validator - Say how to write expression: when it is given text
> instead of a language
> ---------------------------------------------------------------------------------------------------
>
> Key: CAMEL-25402
> URL: https://issues.apache.org/jira/browse/CAMEL-25402
> Project: Camel
> Issue Type: Improvement
> Components: camel-yaml-dsl
> Reporter: Claus Ibsen
> Priority: Minor
> Fix For: 4.23.0
>
>
> When the expression: key of an EIP (split, setHeader, setBody, filter, ...)
> is given text, the YAML DSL validator reports only:
> {noformat}
> Line 6: /0/route/from/steps/0/split/expression: string found, object expected
> Line 6: /0/route/from/steps/0/split/expression: string found, object expected
> {noformat}
> The message is reported twice and does not say what to write. Examples:
> {code}
> - split:
> expression: "${body}"
> - setHeader:
> name: CamelHttpResponseCode
> expression: constant 404
> {code}
> The validator already has a hint for expression options such as handled and
> completionSizeExpression, but not for the expression: key of an EIP.
> Proposal: report it once, with the form to write, e.g.
> {noformat}
> a plain value (constant 404) found, a language expected: expression: holds
> the language as its key, write expression: {constant: {expression: "404"}}
> {noformat}
> simple when the text contains ${, constant otherwise, and a language name in
> front of the text (constant 404) is used as the language.
> Found in the local model benchmark (qwen3.6:35b-a3b through the
> camel-jbang-mcp server): the model met this message in 10 steps of the r6
> ladder run and kept rewriting the same YAML (92 refused writes), failing
> csv-to-json and openapi-server steps.
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