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https://issues.apache.org/jira/browse/CAMEL-25998?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18130932#comment-18130932
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Claus Ibsen commented on CAMEL-25998:
-------------------------------------
Fix in PR https://github.com/apache/camel/pull/28355 (one PR for the 16 data
format tickets CAMEL-25995 to CAMEL-26011, except CAMEL-26000). The PR
description lists the change per ticket.
_Claude Code on behalf of davsclaus_
> camel-groovy - groovyJson cannot marshal a List, also the List its unmarshal
> gives for a JSON array
> ---------------------------------------------------------------------------------------------------
>
> Key: CAMEL-25998
> URL: https://issues.apache.org/jira/browse/CAMEL-25998
> Project: Camel
> Issue Type: Bug
> Components: camel-groovy
> Affects Versions: 4.18.0, 4.22.0, 4.23.0
> Reporter: Claus Ibsen
> Assignee: Claus Ibsen
> Priority: Minor
> Fix For: 4.24.0
>
>
> The groovyJson data format writes a Map, a Groovy {{Node}} or a Jackson
> {{JsonNode}} as JSON. Any other body goes through
> {{mandatoryConvertTo(byte[])}} and is written as it is
> ({{GroovyJSonlDataFormat}}, main 50d17f9c2614, line 61). There is no type
> converter from a {{List}} to a {{byte[]}}, so marshal of a List fails:
> {{TypeConversionException: Error during type conversion from type:
> java.lang.String to the required type: byte[] due to
> java.lang.IllegalArgumentException: argument type mismatch}}. This includes
> the List that unmarshal of a JSON array gives. The data format docs list
> "Java List object" as a body that marshal takes.
> groovyXml has the same path ({{GroovyXmlDataFormat}}, line 107) and fails the
> same way for a List. There, a List has no root element, so a clear error is
> enough.
> Checked on 4.24.0-SNAPSHOT with {{camel run}}:
> * {{[\{"id":1\},\{"id":2\}]}}, then {{unmarshal: groovyJson}}: an
> {{ArrayList}} of {{LazyMap}}, as expected;
> * then {{marshal: groovyJson}}: the {{TypeConversionException}} above;
> * a List of two Maps with {{marshal: groovyXml}}: the same.
> *Proposed change*: write a List (or another Collection) as a JSON array in
> groovyJson, as JsonOutput does. In groovyXml, fail with an
> {{InvalidPayloadException}} that says a List has no root element.
> _Claude Code on behalf of davsclaus_
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