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https://issues.apache.org/jira/browse/CAMEL-26147?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Work on CAMEL-26147 started by Vignesh Nayak Manel.
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> camel-jpa - a consumer whose query returns scalar values delivers nothing
> with the default consumeLockEntity=true
> -----------------------------------------------------------------------------------------------------------------
>
> Key: CAMEL-26147
> URL: https://issues.apache.org/jira/browse/CAMEL-26147
> Project: Camel
> Issue Type: Bug
> Components: camel-jpa
> Reporter: Claus Ibsen
> Assignee: Vignesh Nayak Manel
> Priority: Major
> Fix For: 4.24.0
>
>
> Found while adding the catalog body types of jpa (CAMEL-24961, PR #28393).
> h4. 1. A consumer whose query returns scalar values delivers nothing
> With the default {{consumeLockEntity=true}}, {{JpaConsumer.lockEntity}} (main
> 2a465aa4814c, line 372) calls {{entityManager.lock}} on each result. For a
> query that selects a column (a String, a Long...) the lock fails, and the
> catch block returns {{entity.getClass().isArray()}} (line 393), which is
> false, so {{processBatch}} (line 198) skips every row. The only trace is a
> DEBUG log, so the route never gets a message and nothing says why. Checked on
> 4.24.0-SNAPSHOT with OpenJPA and H2.
> Proposed: do not lock (return true) when the result is not an entity, or at
> least log the skip at WARN.
> h4. 2. Doc: the entity class name is not optional for sending, and a List
> needs jpa:java.util.List
> The jpa doc says "For sending to the endpoint, the _entityClassName_ is
> optional", but the path is required ({{JpaEndpoint}}, main 2a465aa4814c,
> lines 58-60, {{@Metadata(required = true)}}). The doc also says the body may
> be "a collection or array of entity beans", but a List sent to
> {{jpa:<Entity>}} fails, because the producer converts the body to the entity
> type ({{getMandatoryBody(getEntityType())}}, line 608); only
> {{jpa:java.util.List}} works, which the doc calls "entityType=java.util.List
> as a configuration". Checked on 4.24.0-SNAPSHOT with OpenJPA and H2.
> Proposed: fix the doc (the path is required; use {{jpa:java.util.List}} for a
> List), or let the producer accept a collection or array of the entity type.
> _Claude Code on behalf of davsclaus_
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