Add support for @Component to TypeResolverHelper

spring-ai-core/src/main/java/org/springframework/ai/model/function/TypeResolverHelper.java

@@ -152,6 +152,16 @@ else if (isParamMismatch(uniqueCandidate, candidate)) {
 			rootBeanDefinition.setResolvedFactoryMethod(uniqueCandidate);
 			return rootBeanDefinition.getResolvableType();
 		}
+		// Support for @Component
+		if (beanDefinition.getFactoryMethodName() == null && beanDefinition.getBeanClassName() != null) {
+			try {
+				return ResolvableType.forClass(
+						ClassUtils.forName(beanDefinition.getBeanClassName(), applicationContext.getClassLoader()));
+			}
+			catch (ClassNotFoundException ex) {
+				throw new IllegalArgumentException("Impossible to resolve the type of bean " + beanName, ex);
+			}
+		}
 		throw new IllegalArgumentException("Impossible to resolve the type of bean " + beanName);
 	}
 

spring-ai-core/src/test/java/org/springframework/ai/model/function/TypeResolverHelperIT.java

@@ -32,14 +32,14 @@
 import static org.assertj.core.api.Assertions.assertThat;
 
 @SpringBootTest
-class TypeResolverHelperIT {
+public class TypeResolverHelperIT {
 
 	@Autowired
 	GenericApplicationContext applicationContext;
 
 	@ParameterizedTest(name = "{0} : {displayName} ")
 	@ValueSource(strings = { "weatherClassDefinition", "weatherFunctionDefinition", "standaloneWeatherFunction",
-			"scannedStandaloneWeatherFunction" })
+			"scannedStandaloneWeatherFunction", "componentWeatherFunction" })
 	void beanInputTypeResolutionWithResolvableType(String beanName) {
 		assertThat(this.applicationContext).isNotNull();
 		ResolvableType functionType = TypeResolverHelper.resolveBeanType(this.applicationContext, beanName);
@@ -70,7 +70,8 @@ public WeatherResponse apply(WeatherRequest weatherRequest) {
 	}
 
 	@Configuration
-	@ComponentScan("org.springframework.ai.model.function.config")
+	@ComponentScan({ "org.springframework.ai.model.function.config",
+			"org.springframework.ai.model.function.component" })
 	public static class TypeResolverHelperConfiguration {
 
 		@Bean

spring-ai-core/src/test/java/org/springframework/ai/model/function/component/ComponentWeatherFunction.java

@@ -0,0 +1,36 @@
+/*
+ * Copyright 2023-2024 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.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.ai.model.function.component;
+
+import java.util.function.Function;
+
+import org.springframework.ai.model.function.TypeResolverHelperIT.WeatherRequest;
+import org.springframework.ai.model.function.TypeResolverHelperIT.WeatherResponse;
+import org.springframework.stereotype.Component;
+
+/**
+ * @author Sebastien Deleuze
+ */
+@Component
+public class ComponentWeatherFunction implements Function<WeatherRequest, WeatherResponse> {
+
+	@Override
+	public WeatherResponse apply(WeatherRequest weatherRequest) {
+		return new WeatherResponse(42.0f);
+	}
+
+}