fix #1593 SpringBoot scanBasePackages does not take effect (#36)

Changes Made:
- add scanBasePackages(class) as basePackages
- unit test

Relevant Links:
- langchain4j/langchain4j#1593

langchain4j-spring-boot-starter/src/main/java/dev/langchain4j/service/spring/AiServiceScannerProcessor.java

@@ -5,8 +5,11 @@
 import org.springframework.beans.factory.support.BeanDefinitionRegistry;
 import org.springframework.beans.factory.support.BeanDefinitionRegistryPostProcessor;
 import org.springframework.boot.autoconfigure.AutoConfigurationPackages;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
 import org.springframework.context.annotation.ComponentScan;
+import org.springframework.core.annotation.AnnotationUtils;
 import org.springframework.stereotype.Component;
+import org.springframework.util.ClassUtils;
 
 import java.util.Collections;
 import java.util.LinkedHashSet;
@@ -47,6 +50,15 @@ private Set<String> getBasePackages(ConfigurableListableBeanFactory beanFactory)
             }
         }
 
+        String[] applicationBean = beanFactory.getBeanNamesForAnnotation(SpringBootApplication.class);
+        SpringBootApplication springbootApplication = AnnotationUtils.findAnnotation(beanFactory.getType(applicationBean[0]), SpringBootApplication.class);
+        if (springbootApplication != null) {
+            Collections.addAll(basePackages, springbootApplication.scanBasePackages());
+            for (Class<?> aClass : springbootApplication.scanBasePackageClasses()) {
+                basePackages.add(ClassUtils.getPackageName(aClass));
+            }
+        }
+
         return basePackages;
     }
 }

langchain4j-spring-boot-starter/src/test/java/dev/langchain4j/service/spring/mode/automatic/scanPackages/aiService/ScanPackageAiService.java

@@ -0,0 +1,9 @@
+package dev.langchain4j.service.spring.mode.automatic.scanPackages.aiService;
+
+import dev.langchain4j.service.spring.AiService;
+
+@AiService
+public interface ScanPackageAiService {
+
+    String chat(String userMessage);
+}

langchain4j-spring-boot-starter/src/test/java/dev/langchain4j/service/spring/mode/automatic/scanPackages/package1/ScanPackageAiServiceApplication.java

@@ -0,0 +1,12 @@
+package dev.langchain4j.service.spring.mode.automatic.scanPackages.package1;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication(scanBasePackages = {"dev.langchain4j.service.spring.mode.automatic.scanPackages.aiService"})
+public class ScanPackageAiServiceApplication {
+
+    public static void main(String[] args) {
+        SpringApplication.run(ScanPackageAiServiceApplication.class, args);
+    }
+}

langchain4j-spring-boot-starter/src/test/java/dev/langchain4j/service/spring/mode/automatic/scanPackages/package1/ScanPackageAiServiceIT.java

@@ -0,0 +1,40 @@
+package dev.langchain4j.service.spring.mode.automatic.scanPackages.package1;
+
+import dev.langchain4j.service.spring.AiServicesAutoConfig;
+import dev.langchain4j.service.spring.mode.automatic.scanPackages.aiService.ScanPackageAiService;
+import org.junit.jupiter.api.Test;
+import org.springframework.boot.autoconfigure.AutoConfigurations;
+import org.springframework.boot.test.context.runner.ApplicationContextRunner;
+
+import static dev.langchain4j.service.spring.mode.ApiKeys.OPENAI_API_KEY;
+import static org.assertj.core.api.Assertions.assertThat;
+
+class ScanPackageAiServiceIT {
+
+    ApplicationContextRunner contextRunner = new ApplicationContextRunner()
+            .withConfiguration(AutoConfigurations.of(AiServicesAutoConfig.class));
+
+    @Test
+    void should_create_AI_service_that_use_scanPackages_value() {
+
+        contextRunner
+                .withPropertyValues(
+                        "langchain4j.open-ai.chat-model.api-key=" + OPENAI_API_KEY,
+                        "langchain4j.open-ai.chat-model.max-tokens=20",
+                        "langchain4j.open-ai.chat-model.temperature=0.0"
+                )
+                .withUserConfiguration(ScanPackageAiServiceApplication.class)
+                .run(context -> {
+
+                    // given
+                    ScanPackageAiService aiService = context.getBean(ScanPackageAiService.class);
+
+                    // when
+                    String answer = aiService.chat("What is the capital of Germany?");
+
+                    // then
+                    assertThat(answer).containsIgnoringCase("Berlin");
+                });
+    }
+
+}

langchain4j-spring-boot-starter/src/test/java/dev/langchain4j/service/spring/mode/automatic/scanPackages/package2/ScanPackageAiServiceApplication.java

@@ -0,0 +1,13 @@
+package dev.langchain4j.service.spring.mode.automatic.scanPackages.package2;
+
+import dev.langchain4j.service.spring.mode.automatic.scanPackages.aiService.ScanPackageAiService;
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication(scanBasePackageClasses = ScanPackageAiService.class)
+public class ScanPackageAiServiceApplication {
+
+    public static void main(String[] args) {
+        SpringApplication.run(ScanPackageAiServiceApplication.class, args);
+    }
+}

langchain4j-spring-boot-starter/src/test/java/dev/langchain4j/service/spring/mode/automatic/scanPackages/package2/ScanPackageAiServiceIT.java

@@ -0,0 +1,40 @@
+package dev.langchain4j.service.spring.mode.automatic.scanPackages.package2;
+
+import dev.langchain4j.service.spring.AiServicesAutoConfig;
+import dev.langchain4j.service.spring.mode.automatic.scanPackages.aiService.ScanPackageAiService;
+import org.junit.jupiter.api.Test;
+import org.springframework.boot.autoconfigure.AutoConfigurations;
+import org.springframework.boot.test.context.runner.ApplicationContextRunner;
+
+import static dev.langchain4j.service.spring.mode.ApiKeys.OPENAI_API_KEY;
+import static org.assertj.core.api.Assertions.assertThat;
+
+class ScanPackageAiServiceIT {
+
+    ApplicationContextRunner contextRunner = new ApplicationContextRunner()
+            .withConfiguration(AutoConfigurations.of(AiServicesAutoConfig.class));
+
+    @Test
+    void should_create_AI_service_that_use_scanPackageClass_value() {
+
+        contextRunner
+                .withPropertyValues(
+                        "langchain4j.open-ai.chat-model.api-key=" + OPENAI_API_KEY,
+                        "langchain4j.open-ai.chat-model.max-tokens=20",
+                        "langchain4j.open-ai.chat-model.temperature=0.0"
+                )
+                .withUserConfiguration(ScanPackageAiServiceApplication.class)
+                .run(context -> {
+
+                    // given
+                    ScanPackageAiService aiService = context.getBean(ScanPackageAiService.class);
+
+                    // when
+                    String answer = aiService.chat("What is the capital of Germany?");
+
+                    // then
+                    assertThat(answer).containsIgnoringCase("Berlin");
+                });
+    }
+
+}