Allow using langchain4j module

src/main/java/tech/jhipster/lite/generator/server/springboot/langchain4j/application/LangChain4JApplicationService.java

@@ -0,0 +1,20 @@
+package tech.jhipster.lite.generator.server.springboot.langchain4j.application;
+
+import org.springframework.stereotype.Service;
+import tech.jhipster.lite.generator.server.springboot.langchain4j.domain.LangChain4JModuleFactory;
+import tech.jhipster.lite.module.domain.JHipsterModule;
+import tech.jhipster.lite.module.domain.properties.JHipsterModuleProperties;
+
+@Service
+public class LangChain4JApplicationService {
+
+  private final LangChain4JModuleFactory factory;
+
+  public LangChain4JApplicationService() {
+    factory = new LangChain4JModuleFactory();
+  }
+
+  public JHipsterModule buildModule(JHipsterModuleProperties properties) {
+    return factory.buildModule(properties);
+  }
+}

src/main/java/tech/jhipster/lite/generator/server/springboot/langchain4j/domain/LangChain4JModuleFactory.java

@@ -0,0 +1,45 @@
+package tech.jhipster.lite.generator.server.springboot.langchain4j.domain;
+
+import static tech.jhipster.lite.module.domain.JHipsterModule.*;
+
+import tech.jhipster.lite.module.domain.JHipsterModule;
+import tech.jhipster.lite.module.domain.file.JHipsterSource;
+import tech.jhipster.lite.module.domain.javabuild.GroupId;
+import tech.jhipster.lite.module.domain.javabuild.VersionSlug;
+import tech.jhipster.lite.module.domain.properties.JHipsterModuleProperties;
+import tech.jhipster.lite.shared.error.domain.Assert;
+
+public class LangChain4JModuleFactory {
+
+  private static final JHipsterSource SOURCE = from("server/springboot/langchain4j");
+  private static final GroupId LANGCHAIN4J_GROUP_ID = groupId("dev.langchain4j");
+  private static final VersionSlug LANGCHAIN4J_VERSION_SLUG = versionSlug("langchain4j");
+
+  private static final String PROPERTIES = "properties";
+
+  public JHipsterModule buildModule(JHipsterModuleProperties properties) {
+    Assert.notNull(PROPERTIES, properties);
+
+    //@formatter:off
+    return moduleBuilder(properties)
+      .documentation(documentationTitle("Dev tools"), SOURCE.template("langchain4j.md"))
+      .javaDependencies()
+      .addDependency(LANGCHAIN4J_GROUP_ID,
+        artifactId("langchain4j-spring-boot-starter"),
+        LANGCHAIN4J_VERSION_SLUG)
+      .addDependency(LANGCHAIN4J_GROUP_ID,
+        artifactId("langchain4j-open-ai-spring-boot-starter"),
+        LANGCHAIN4J_VERSION_SLUG)
+      .and()
+      .files()
+      .and()
+      .springMainProperties()
+      .set(propertyKey("langchain4j.open-ai.chat-model.api-key"), propertyValue("${OPENAI_API_KEY}"))
+      .set(propertyKey("langchain4j.open-ai.chat-model.model-name"), propertyValue("gpt-4o-mini"))
+      .set(propertyKey("langchain4j.open-ai.chat-model.log-requests"), propertyValue("true"))
+      .set(propertyKey("langchain4j.open-ai.chat-model.log-responses"), propertyValue("true"))
+      .and()
+      .build();
+    //@formatter:on
+  }
+}

src/main/java/tech/jhipster/lite/generator/server/springboot/langchain4j/infrastructure/primary/LangChain4JModuleConfiguration.java

@@ -0,0 +1,26 @@
+package tech.jhipster.lite.generator.server.springboot.langchain4j.infrastructure.primary;
+
+import static tech.jhipster.lite.shared.slug.domain.JHLiteModuleSlug.LANGCHAIN4J;
+import static tech.jhipster.lite.shared.slug.domain.JHLiteModuleSlug.SPRING_BOOT;
+
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import tech.jhipster.lite.generator.server.springboot.langchain4j.application.LangChain4JApplicationService;
+import tech.jhipster.lite.module.domain.resource.JHipsterModuleOrganization;
+import tech.jhipster.lite.module.domain.resource.JHipsterModulePropertiesDefinition;
+import tech.jhipster.lite.module.domain.resource.JHipsterModuleResource;
+
+@Configuration
+class LangChain4JModuleConfiguration {
+
+  @Bean
+  JHipsterModuleResource langChain4JModule(LangChain4JApplicationService langChain4J) {
+    return JHipsterModuleResource.builder()
+      .slug(LANGCHAIN4J)
+      .propertiesDefinition(JHipsterModulePropertiesDefinition.builder().addProjectBaseName().addIndentation().build())
+      .apiDoc("LangChain4J", "Add LangChain4J Spring dependency")
+      .organization(JHipsterModuleOrganization.builder().addDependency(SPRING_BOOT).build())
+      .tags("server", "spring", "spring-boot", "langchain4j")
+      .factory(langChain4J::buildModule);
+  }
+}

src/main/java/tech/jhipster/lite/generator/server/springboot/langchain4j/package-info.java

@@ -0,0 +1,2 @@
+@tech.jhipster.lite.BusinessContext
+package tech.jhipster.lite.generator.server.springboot.langchain4j;

src/main/java/tech/jhipster/lite/shared/slug/domain/JHLiteModuleSlug.java

@@ -156,7 +156,8 @@ public enum JHLiteModuleSlug implements JHipsterModuleSlugFactory {
   VUE_OAUTH2_KEYCLOAK("vue-oauth2-keycloak"),
   VUE_PINIA("vue-pinia"),
   TS_PAGINATION_DOMAIN("ts-pagination-domain"),
-  TS_REST_PAGINATION("ts-rest-pagination");
+  TS_REST_PAGINATION("ts-rest-pagination"),
+  LANGCHAIN4J("langchain4j");
 
   private static final Map<String, JHLiteModuleSlug> moduleSlugMap = Stream.of(values()).collect(
     Collectors.toMap(JHLiteModuleSlug::get, Function.identity())

src/main/resources/generator/dependencies/pom.xml

@@ -71,6 +71,7 @@
     <asciidoctor-maven-plugin.version>3.0.0</asciidoctor-maven-plugin.version>
     <openapi-maven-plugin.version>0.0.21</openapi-maven-plugin.version>
     <openapi-backwards-compat-maven-plugin.version>1.0.3</openapi-backwards-compat-maven-plugin.version>
+    <langchain4j.version>0.35.0</langchain4j.version>
   </properties>
 
   <dependencyManagement>
@@ -406,6 +407,16 @@
         <artifactId>openapi-backwards-compat-maven-plugin</artifactId>
         <version>${openapi-backwards-compat-maven-plugin.version}</version>
       </dependency>
+      <dependency>
+        <groupId>dev.langchain4j</groupId>
+        <artifactId>langchain4j-spring-boot-starter</artifactId>
+        <version>${langchain4j.version}</version>
+      </dependency>
+      <dependency>
+        <groupId>dev.langchain4j</groupId>
+        <artifactId>langchain4j-open-ai-spring-boot-starter</artifactId>
+        <version>${langchain4j.version}</version>
+      </dependency>
     </dependencies>
   </dependencyManagement>
 </project>

src/main/resources/generator/server/springboot/langchain4j/langchain4j.md.mustache

@@ -0,0 +1,5 @@
+# LangChain4J
+
+How to use it :
+
+[Official documentation](https://docs.langchain4j.dev/tutorials/spring-boot-integration/)

src/test/features/server/springboot/langchain4j.feature

@@ -0,0 +1,10 @@
+Feature: LangChain4J module
+
+  Scenario: Should add Spring Boot LangChain4J Starter
+    When I apply modules to default project
+      | maven-java  |
+      | spring-boot |
+      | langchain4j |
+    Then I should have entries in "src/main/resources/config/application.yml"
+      | open-ai     |
+      | langchain4j |

src/test/java/tech/jhipster/lite/generator/server/springboot/langchain4j/domain/LangChain4JModuleFactoryTest.java

@@ -0,0 +1,66 @@
+package tech.jhipster.lite.generator.server.springboot.langchain4j.domain;
+
+import static tech.jhipster.lite.module.infrastructure.secondary.JHipsterModulesAssertions.assertThatModuleWithFiles;
+import static tech.jhipster.lite.module.infrastructure.secondary.JHipsterModulesAssertions.pomFile;
+
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.mockito.InjectMocks;
+import org.mockito.junit.jupiter.MockitoExtension;
+import tech.jhipster.lite.TestFileUtils;
+import tech.jhipster.lite.UnitTest;
+import tech.jhipster.lite.module.domain.JHipsterModule;
+import tech.jhipster.lite.module.domain.JHipsterModulesFixture;
+import tech.jhipster.lite.module.domain.properties.JHipsterModuleProperties;
+
+@UnitTest
+@ExtendWith(MockitoExtension.class)
+class LangChain4JModuleFactoryTest {
+
+  @InjectMocks
+  private LangChain4JModuleFactory factory;
+
+  @Test
+  void shouldCreateModule() {
+    JHipsterModuleProperties properties = JHipsterModulesFixture.propertiesBuilder(TestFileUtils.tmpDirForTest())
+      .projectBaseName("myApp")
+      .build();
+
+    JHipsterModule module = factory.buildModule(properties);
+
+    assertThatModuleWithFiles(module, pomFile())
+      .hasFile("pom.xml")
+      .containing("<langchain4j.version>")
+      .containing(
+        """
+            <dependency>
+              <groupId>dev.langchain4j</groupId>
+              <artifactId>langchain4j-spring-boot-starter</artifactId>
+              <version>${langchain4j.version}</version>
+            </dependency>
+        """
+      )
+      .containing(
+        """
+            <dependency>
+              <groupId>dev.langchain4j</groupId>
+              <artifactId>langchain4j-open-ai-spring-boot-starter</artifactId>
+              <version>${langchain4j.version}</version>
+            </dependency>
+        """
+      )
+      .and()
+      .hasFile("src/main/resources/config/application.yml")
+      .containing(
+        """
+        langchain4j:
+          open-ai:
+            chat-model:
+              api-key: ${OPENAI_API_KEY}
+              log-requests: 'true'
+              log-responses: 'true'
+              model-name: gpt-4o-mini
+        """
+      );
+  }
+}