Claus Ibsen created CAMEL-25863:
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Summary: camel-langchain4j-chat - the docs say that the body is
the message and the answer replaces it, with an example that keeps the data
Key: CAMEL-25863
URL: https://issues.apache.org/jira/browse/CAMEL-25863
Project: Camel
Issue Type: Improvement
Components: camel-langchain4j-chat
Reporter: Claus Ibsen
Fix For: 4.24.0
The langchain4j-chat page does not say what happens to the body: the component
sends it as the user message, and the answer of the model replaces it. A route
that classifies data (a ticket, a review) and goes on with that data loses it,
and a model that writes such a route reads the answer where it expects the data.
Found in a benchmark of Oct 19-20 2026 (an example that classifies support
tickets with a local model): in 10 of 12 runs the body became the model's
answer ("Dear Customer, ..."), and the route then failed on
{{${body[ticketId]}}}. No run used {{variableSend}}/{{variableReceive}} of the
{{to}}, which keep the data and give the answer in a variable.
Also:
* The only prompt example is Java with a template {{Create a recipe for a
{{dishType}} ...}}. In YAML and XML routes, {{name}} is a property placeholder
of Camel, resolved before the route runs: 5 runs copied the form and got
"Property with key [...] not found" on every reload.
* The error for a missing template says "The promptTemplate is a required
header", without the name of the header, {{CamelLangChain4jChatPromptTemplate}}.
Proposal:
* A section "The body is the message, and the answer replaces it", with an
example in Java, XML and YAML that builds the prompt in a variable and receives
the answer in another (variableSend, variableReceive), so the body stays as it
was.
* The section on templates names the header and says that {{name}} is a
property placeholder in YAML, XML and properties files.
* The error names the header.
_Claude Code on behalf of davsclaus_
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