Spring-ai Unable to generate image when the key 'spring.ai.openai.image.options.size' is not configured

Bug description When invoking the OpenAI API for generating an image, irrespective of the model (dall-e-3 or dall-e-2), the size attribute in the request body is optional and defaults to the string '1024x1024'.

However, when using Spring AI to generate an image, the below exception is encountered when the key spring.ai.openai.image.options.size is not configured:

org.springframework.ai.retry.NonTransientAiException: 400 - {
  "error": {
    "code": null,
    "message": "'nullxnull' is not one of ['256x256', '512x512', '1024x1024', '1024x1792', '1792x1024'] - 'size'",
    "param": null,
    "type": "invalid_request_error"
  }
}

The parameter is being set to a string nullxnull instead of null which is causing the OpenAI API to return a 400 Bad request error.

Environment Using the Spring AI version : 1.0.0-M4 with Java 23

Expected behavior The image should be generated without having to explicitly set a value for the key spring.ai.openai.image.options.size.

Steps to reproduce and Minimal Complete Reproducible example Reproducible example can be found here. Execute the below command to get the exception:

OPENAI_API_KEY="api-key-goes-here" mvn test -Dtest=ImageGeneratorLiveTest

Comment From: timosalm

Duplicate of #1788

Comment From: hardikSinghBehl

Thanks @timosalm, I'll close this one.