CAMEL-23947: Remove unwired langchain4j-chat model builder helpers

[atiaomar1978-hub]

CAMEL-23947 is done

What changed

Per the Jira recommendation, the unwired dead-code helpers were removed (not fixed/wired):

1. Deleted OpenAiChatLanguageModelBuilder.java — had a bug where .logRequests(logResponses) swapped the logging flags
2. Deleted HugginFaceChatLanguageModelBuilder.java — returned HuggingFaceLanguageModel (LanguageModel), not ChatModel
3. Added upgrade guide note in camel-4x-upgrade-guide-4_22.adoc under === camel-langchain4j-chat

Neither builder was referenced anywhere else in the codebase; the component autowires chatModel instead.

Tests

Ran with Java 21:

.\mvnw.cmd -pl components/camel-ai/camel-langchain4j-chat test

BUILD SUCCESS — 4 tests passed (LangChain4jRagAggregatorTest). The Jira attachment reproducer test was not added because it targets code we removed.

Commit & push

• Commit: 4e2522e7bd1 — CAMEL-23947: Remove unwired langchain4j-chat model builder helpers
• Branch: https://github.com/atiaomar1978-hub/camel/tree/CAMEL-23947-remove-unwired-model-builders

[gnodet]

Review: CAMEL-23947 — Remove unwired langchain4j-chat model builder helpers

Clean removal of two dead-code helper classes, both of which contained bugs confirming they were never actively used:

1. OpenAiChatLanguageModelBuilder — .logRequests(logResponses) on line 72 passes the wrong field to logRequests() (should be .logResponses(logResponses)).
2. HugginFaceChatLanguageModelBuilder — build() returns HuggingFaceLanguageModel (a LanguageModel), not a ChatModel, contradicting the class name.

Neither class was referenced anywhere in the codebase — the component autowires chatModel directly. Removing rather than fixing is the right call per the JIRA recommendation.

The upgrade guide entry is correctly placed and provides clear migration guidance (use LangChain4j's own builders or Spring Boot starters).

LGTM ✅

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AI-generated review — Claude Code on behalf of gnodet.
Review based on code analysis only; tests were not executed.

[davsclaus]

there is a merge conflict

[atiaomar1978-hub]

@davsclaus I have resolved the merge conflicts, by considering both changes.

[github-actions]

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[github-actions]

🧪 CI tested the following changed modules:

• components/camel-ai/camel-langchain4j-chat
• docs

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🔬 Scalpel shadow comparison — Scalpel: 10 tested, 28 compile-only — current: 9 all tested

Maveniverse Scalpel detected 38 affected modules (current approach: 9).

⚠️ Modules only in Scalpel (29)

• apache-camel
• camel-allcomponents
• camel-catalog
• camel-catalog-console
• camel-catalog-lucene
• camel-catalog-maven
• camel-catalog-suggest
• camel-componentdsl
• camel-csimple-maven-plugin
• camel-endpointdsl
• camel-endpointdsl-support
• camel-itest
• camel-jbang-core
• camel-jbang-it
• camel-jbang-main
• camel-jbang-plugin-edit
• camel-jbang-plugin-generate
• camel-jbang-plugin-kubernetes
• camel-jbang-plugin-test
• camel-kamelet-main
• camel-launcher
• camel-report-maven-plugin
• camel-route-parser
• camel-yaml-dsl
• camel-yaml-dsl-deserializers
• camel-yaml-dsl-maven-plugin
• coverage
• docs
• dummy-component

Skip-tests mode would test 10 modules (2 direct + 8 downstream), skip tests for 28 (generated code, meta-modules)

Modules Scalpel would test (10)

• camel-jbang-mcp
• camel-jbang-plugin-mcp
• camel-jbang-plugin-route-parser
• camel-jbang-plugin-tui
• camel-jbang-plugin-validate
• camel-langchain4j-chat
• camel-launcher-container
• camel-yaml-dsl-validator
• camel-yaml-dsl-validator-maven-plugin
• docs

Modules with tests skipped (28)

• apache-camel
• camel-allcomponents
• camel-catalog
• camel-catalog-console
• camel-catalog-lucene
• camel-catalog-maven
• camel-catalog-suggest
• camel-componentdsl
• camel-csimple-maven-plugin
• camel-endpointdsl
• camel-endpointdsl-support
• camel-itest
• camel-jbang-core
• camel-jbang-it
• camel-jbang-main
• camel-jbang-plugin-edit
• camel-jbang-plugin-generate
• camel-jbang-plugin-kubernetes
• camel-jbang-plugin-test
• camel-kamelet-main
• camel-launcher
• camel-report-maven-plugin
• camel-route-parser
• camel-yaml-dsl
• camel-yaml-dsl-deserializers
• camel-yaml-dsl-maven-plugin
• coverage
• dummy-component

ℹ️ Shadow mode — Scalpel observes but does not affect test execution. Learn more

⚠️ Some tests are disabled on GitHub Actions (@DisabledIfSystemProperty(named = "ci.env.name")) and require manual verification:

• components/camel-ai/camel-langchain4j-chat: 1 test(s) disabled on GitHub Actions

All tested modules (38 modules)

• Camel :: AI :: LangChain4j :: Chat
• Camel :: All Components Sync point
• Camel :: Assembly
• Camel :: Catalog :: CSimple Maven Plugin (deprecated)
• Camel :: Catalog :: Camel Catalog
• Camel :: Catalog :: Camel Report Maven Plugin
• Camel :: Catalog :: Camel Route Parser
• Camel :: Catalog :: Console
• Camel :: Catalog :: Dummy Component
• Camel :: Catalog :: Lucene (deprecated)
• Camel :: Catalog :: Maven
• Camel :: Catalog :: Suggest
• Camel :: Component DSL
• Camel :: Coverage
• Camel :: Docs
• Camel :: Endpoint DSL
• Camel :: Endpoint DSL :: Support
• Camel :: Integration Tests
• Camel :: JBang :: Core
• Camel :: JBang :: Integration tests
• Camel :: JBang :: MCP
• Camel :: JBang :: Main
• Camel :: JBang :: Plugin :: Edit
• Camel :: JBang :: Plugin :: Generate
• Camel :: JBang :: Plugin :: Kubernetes
• Camel :: JBang :: Plugin :: MCP
• Camel :: JBang :: Plugin :: Route Parser
• Camel :: JBang :: Plugin :: TUI
• Camel :: JBang :: Plugin :: Testing
• Camel :: JBang :: Plugin :: Validate
• Camel :: Kamelet Main
• Camel :: Launcher
• Camel :: Launcher :: Container
• Camel :: YAML DSL
• Camel :: YAML DSL :: Deserializers
• Camel :: YAML DSL :: Maven Plugins
• Camel :: YAML DSL :: Validator
• Camel :: YAML DSL :: Validator Maven Plugin

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