CAMEL-24540: camel-huggingface - honour model revision for sentence-embeddings/text-to-image and set the text-to-image OUTPUT header

[oscerd]

Issue

CAMEL-24540

Two small correctness gaps in the Hugging Face task predictors, both incomplete ports of the pattern
the other predictors follow.

1. Model revision ignored for two tasks

SentenceEmbeddingsPredictor and TextToImagePredictor did not pass config.getRevision() into their
generated Python script, so pinning a model revision/branch silently had no effect for these two tasks
(the other eight pass it). The revision is now threaded into:

• sentence_embeddings.py — SentenceTransformer(model, device=..., revision=...)
• text_to_image.py — StableDiffusionPipeline.from_pretrained(model, revision=..., ...)

2. Text-to-image never set the OUTPUT header

TextToImagePredictor.processOutput set the image bytes as the message body but never set the
OUTPUT header, even though its Javadoc documents that header. It now sets
HuggingFaceConstants.OUTPUT to the image bytes alongside the body.

Testing

• New RevisionAndOutputHeaderTest asserts both scripts pin the configured revision and that
  text-to-image publishes the image on the OUTPUT header.
• mvn -Psourcecheck validate green.

Claude Code on behalf of oscerd

[github-actions]

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🧪 CI tested the following changed modules:

• components/camel-ai/camel-huggingface

---

🔬 Scalpel shadow comparison — Scalpel: 9 tested, 27 compile-only — current: 9 all tested

Maveniverse Scalpel detected 36 affected modules (current approach: 9).

⚠️ Modules only in Scalpel (27)

• apache-camel
• camel-allcomponents
• camel-catalog
• camel-catalog-console
• camel-catalog-maven
• camel-catalog-suggest
• camel-componentdsl
• 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 9 modules (1 direct + 8 downstream), skip tests for 27 (generated code, meta-modules)

Modules Scalpel would test (9)

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

Modules with tests skipped (27)

• apache-camel
• camel-allcomponents
• camel-catalog
• camel-catalog-console
• camel-catalog-maven
• camel-catalog-suggest
• camel-componentdsl
• 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

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

All tested modules (36 modules)

• Camel :: AI :: Hugging Face
• Camel :: All Components Sync point
• Camel :: Assembly
• Camel :: Catalog :: Camel Catalog
• Camel :: Catalog :: Camel Report Maven Plugin
• Camel :: Catalog :: Camel Route Parser
• Camel :: Catalog :: Console
• Camel :: Catalog :: Dummy Component
• 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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⚙️ View full build and test results

[gnodet]

Clean, correct bug fix that adds the missing config.getRevision() parameter to the only two predictors that omitted it (SentenceEmbeddingsPredictor and TextToImagePredictor), and adds the missing OUTPUT header to TextToImagePredictor, bringing both in line with the other eight predictors.

Verified:

• %s placeholder ordering in both Python scripts matches the Java argument order
• The revision field defaults to "main" (never null), so the Python substitution is safe
• The OUTPUT header addition is consistent with all other 9 predictors

🔀 Backport Status

⚠️ The camel-huggingface component was introduced in 4.19.0 and this bug has existed since inception. Consider backporting to camel-4.22.x (component does not exist in camel-4.18.x).

This review was generated by an AI agent and may contain inaccuracies. Please verify all suggestions before applying.

Claude Code on behalf of Guillaume Nodet