Spring-ai [Ollama] System messages are excluded from the ChatRequest to Ollama

Bug description When using the ChatClient implementation for Ollama, any Message included in the Prompt with a SYSTEM message type is explicitly excluded when building the ChatRequest for calling Ollama.

Code where the System messages are excluded: https://github.com/spring-projects/spring-ai/blob/08fa0e393c4df5331aa0cd7bdb7e0b66e2782a4a/models/spring-ai-ollama/src/main/java/org/springframework/ai/ollama/OllamaChatClient.java#L125-L126

Environment Spring AI: 0.8.0-SNAPSHOT (as of today, January 22nd) Java: 21 Ollama

Expected behavior I would expect SYSTEM messages to be included in the requests sent to Ollama, similar to how OpenAI works. Ollama supports system messages as described in the documentation,

Minimal Complete Reproducible example Sample project reproducing the error is available here: https://github.com/ThomasVitale/llm-apps-java-spring-ai/tree/main/02-prompts/prompts-messages-ollama. It's a self-contained example with no external dependency other than Java 21 and Docker (no need to install Ollama, the application takes care of that).

Comment From: tzolov

@ThomasVitale thank you for raising this issue. It is a but indeed and the fix is under way.