Make responseMessage in AzureOpenAiChatModel.buildGeneration null-safe

Signed-off-by: Berjan Jonker <berjanjonker@users.noreply.github.com>

Author: berjanjonker

models/spring-ai-azure-openai/src/main/java/org/springframework/ai/azure/openai/AzureOpenAiChatModel.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2023-2024 the original author or authors.
+ * Copyright 2023-2025 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -112,6 +112,7 @@
  * @author Jihoon Kim
  * @author Ilayaperumal Gopinathan
  * @author Alexandros Pappas
+ * @author Berjan Jonker
  * @see ChatModel
  * @see com.azure.ai.openai.OpenAIClient
  * @since 1.0.0
@@ -462,16 +463,19 @@ private Generation buildGeneration(ChatChoice choice, Map<String, Object> metada
 
 		var responseMessage = Optional.ofNullable(choice.getMessage()).orElse(choice.getDelta());
 
-		List<AssistantMessage.ToolCall> toolCalls = responseMessage.getToolCalls() == null ? List.of()
-				: responseMessage.getToolCalls().stream().map(toolCall -> {
-					final var tc1 = (ChatCompletionsFunctionToolCall) toolCall;
-					String id = tc1.getId();
-					String name = tc1.getFunction().getName();
-					String arguments = tc1.getFunction().getArguments();
-					return new AssistantMessage.ToolCall(id, "function", name, arguments);
-				}).toList();
+		List<AssistantMessage.ToolCall> toolCalls = List.of();
+		if (responseMessage != null && responseMessage.getToolCalls() != null) {
+			toolCalls = responseMessage.getToolCalls().stream().map(toolCall -> {
+				final var tc1 = (ChatCompletionsFunctionToolCall) toolCall;
+				String id = tc1.getId();
+				String name = tc1.getFunction().getName();
+				String arguments = tc1.getFunction().getArguments();
+				return new AssistantMessage.ToolCall(id, "function", name, arguments);
+			}).toList();
+		}
 
-		var assistantMessage = new AssistantMessage(responseMessage.getContent(), metadata, toolCalls);
+		var content = responseMessage == null ? "" : responseMessage.getContent();
+		var assistantMessage = new AssistantMessage(content, metadata, toolCalls);
 		var generationMetadata = generateChoiceMetadata(choice);
 
 		return new Generation(assistantMessage, generationMetadata);

models/spring-ai-azure-openai/src/test/java/org/springframework/ai/azure/openai/AzureOpenAiChatModelIT.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2023-2024 the original author or authors.
+ * Copyright 2023-2025 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -22,6 +22,7 @@
 import java.util.List;
 import java.util.Map;
 import java.util.Objects;
+import java.util.concurrent.atomic.AtomicInteger;
 import java.util.stream.Collectors;
 
 import com.azure.ai.openai.OpenAIClientBuilder;
@@ -106,6 +107,26 @@ void testMessageHistory() {
 		assertThat(response.getResult().getOutput().getText()).containsAnyOf("Blackbeard");
 	}
 
+	@Test
+	void testStreaming() {
+		String prompt = """
+				Provide a list of planets in our solar system
+				""";
+
+		final var counter = new AtomicInteger();
+		String content = this.chatModel.stream(prompt)
+			.doOnEach(listSignal -> counter.getAndIncrement())
+			.collectList()
+			.block()
+			.stream()
+			.collect(Collectors.joining());
+		logger.info("Response: {}", content);
+
+		assertThat(counter.get()).isGreaterThan(8).as("More than 8 chuncks because there are 8 planets");
+
+		assertThat(content).contains("Earth", "Mars", "Jupiter");
+	}
+
 	@Test
 	void listOutputConverter() {
 		DefaultConversionService conversionService = new DefaultConversionService();