GH-5116: Fix openai default null tool arguments to empty JSON string #5232
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Signed-off-by: Pilhwan Choi <[email protected]>
Signed-off-by: Pilhwan Choi <[email protected]>
models/spring-ai-openai/src/test/java/org/springframework/ai/openai/api/OpenAiApiIT.java
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Signed-off-by: Pilhwan Choi <[email protected]>
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Fixes #5116
Description
This PR fixes a compatibility issue with strict OpenAI-compatible models (e.g., Qwen) where tool_calls requests failed due to a missing function.arguments field.
Previously, when arguments was null, the field was omitted during serialization due to the @JsonInclude(Include.NON_NULL) annotation. While the official OpenAI API is lenient, strict providers reject this as invalid protocol usage, returning 400 Bad Request.
Changes
Updated the ChatCompletionFunction record in OpenAiApi by adding a compact constructor. This ensures that arguments defaults to "{}" (empty JSON object string) when null, guaranteeing the field is always present in the serialized JSON.
Verification
OpenAiApiT.javato verify that null arguments are correctly converted to "{}" and that the serialized JSON explicitly contains "arguments": "{}".