ChatClient Vision Capability Fails Without Explicit CallAdvisor - java.lang.IllegalStateException: No CallAdvisors available to execute

[dilipsundarraj1]

Bug description
Getting this error when trying to access the vision capability using ChatClient:
java.lang.IllegalStateException: No CallAdvisors available to execute

Environment

• Java version: 21
• Spring AI version: 1.0.0
• Project: multimodal-llms

Steps to reproduce

1. Clone the multimodal-llms project from this link.
2. In VisionController.java, comment out this line:
   defaultAdvisors
3. Start the app by running MultimodalLLMApplication.java:
   MultimodalLLMApplication.java
4. Hit the following curl command:

   curl --request POST \
     --url http://localhost:8083/springai/v2/vision \
     --header 'Content-Type: multipart/form-data' \
     --form file=@/Users/dilipbandlasundarraj/Dilip/code-with-dilip/spring-ai/multimodal-llms/src/main/resources/files/vision/pizza.png \
     --form 'prompt=Explain what do you see in this picture?. Summarize it like an attractive menu item name.'
   

Expected behavior
The vision capability should work even without explicitly adding an advisor in the ChatClient.

Minimal Complete Reproducible example
The issue can be reproduced using the multimodal-llms sample project.
Comment out this line:
VisionController.java#L39
Then hit the POST /springai/v2/vision endpoint.

Fix
This endpoint works only when the following advisor is explicitly added in the controller constructor:

public VisionController(ChatClient.Builder chatClientBuilder,
                        OpenAiChatModel openAiChatModel) {
    this.openAiChatModel = openAiChatModel;
    var advisor = ChatModelCallAdvisor.builder()
            .chatModel(openAiChatModel)
            .build();
    this.chatClient = chatClientBuilder
            .defaultAdvisors(advisor)
            .build();
}

Source: VisionController.java#L39