Support Google Gen AI SDK in `quarkus-google-cloud-vertex-ai`

[umesh-clinware]

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TL;DR: The Quarkus Vertex AI extension currently relies on deprecated Vertex AI generative APIs that will be removed in June 2026. Google recommends the Google Gen AI SDK as the replacement. Updating or replacing the current Vertex AI integration with the Gen AI SDK would avoid future breakage and unlock modern Gemini features (e.g. context caching).

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Hi team,

The current quarkus-google-cloud-vertex-ai extension builds on the Vertex AI SDK generative APIs (for example, com.google.cloud.vertexai.generativeai.GenerativeModel).

Google deprecated these Vertex AI SDK generative modules on June 24, 2025 and plans to remove them entirely after June 24, 2026. Google’s documentation recommends migrating to the Google Gen AI SDK as the supported path forward.

Impact

• Modern Gemini features (such as improved context caching) are unavailable or lagging
• Applications built on the extension today will face breaking changes when the deprecated APIs are removed
• Any future migration will be disruptive rather than incremental

Request

Please consider updating the existing Vertex AI extension to use the Google Gen AI SDK internally, or replacing the underlying Vertex AI generative integration with the Gen AI SDK, while keeping the extension surface area and Quarkus native / GraalVM compatibility intact.

This would future-proof the extension and allow Quarkus users to adopt modern Gemini capabilities without a forced rewrite later.

Thanks for maintaining the Quarkus Google Cloud extensions.

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References

• Google deprecation notice: https://docs.cloud.google.com/vertex-ai/generative-ai/docs/deprecations/genai-vertexai-sdk

[loicmathieu]

There is an issue with recent version of the Google Cloud libraries and native image processing which prevent us for upgrading so far.

[umesh-clinware]

There is an issue with recent version of the Google Cloud libraries and native image processing which prevent us for upgrading so far.

Thanks for the clarification, @loicmathieu !

From your perspective, what would be the best way to move this forward given the native-image limitations in the newer Google libraries?

Would raising an upstream issue with Google help in this case? If so, is there a preferred repository or an existing issue we should align with?

[loicmathieu]

My last attempt is here: #951
I need to find the time to investiguate more...

[umesh-clinware]

Thanks for sharing this, @loicmathieu !

One thought from our side: with the Vertex AI SDK generative APIs being deprecated, upgrading that SDK may not be long-term. Google recommends the Gen AI SDK going forward.

Would you recommend focusing on Gen AI SDK native-image compatibility instead?

reference: https://docs.cloud.google.com/vertex-ai/generative-ai/docs/deprecations/genai-vertexai-sdk

[loicmathieu]

@umesh-clinware I understand that, you don't need to repeate yourself, and I already answer to that.

[taziz-clinware]

@loicmathieu Now that your earlier efforts to upgrade the Google Cloud libraries were successful, many thanks for the time and care you put into that, would it be possible for you to take a look at including the GenAI SDK as well? many thanks!