feat(spring-boot-starter-adk): Add Spring Boot Starter support

contrib/spring-boot-starter-adk/pom.xml

@@ -0,0 +1,42 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <parent>
+        <groupId>com.google.adk</groupId>
+        <artifactId>google-adk-parent</artifactId>
+        <version>0.2.1-SNAPSHOT</version><!-- {x-version-update:google-adk:current} -->
+        <relativePath>../../pom.xml</relativePath>
+    </parent>
+
+    <artifactId>spring-boot-starter-adk</artifactId>
+    <name>Agent Development Kit - Spring Boot Starter</name>
+    <description>Spring Boot Starter for the Agent Development Kit.</description>
+
+    <dependencies>
+        <dependency>
+            <groupId>com.google.adk</groupId>
+            <artifactId>google-adk</artifactId>
+            <version>${project.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>com.google.adk</groupId>
+            <artifactId>google-adk-dev</artifactId>
+            <version>${project.version}</version>
+        </dependency>
+
+        <!-- Test dependencies -->
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-test</artifactId>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.mockito</groupId>
+            <artifactId>mockito-core</artifactId>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+</project>

contrib/spring-boot-starter-adk/src/main/java/com/google/adk/starters/springboot/AdkSpringbootAutoConfiguration.java

@@ -0,0 +1,33 @@
+/*
+ * Copyright 2025 Google LLC
+ *
+ * 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
+ *
+ *     http://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 com.google.adk.starters.springboot;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.context.annotation.ComponentScan;
+import org.springframework.context.annotation.Configuration;
+
+@Configuration
+@ComponentScan("com.google.adk")
+public class AdkSpringbootAutoConfiguration {
+
+  private static final Logger logger =
+      LoggerFactory.getLogger(AdkSpringbootAutoConfiguration.class);
+
+  public AdkSpringbootAutoConfiguration() {
+    logger.info("AdkSpringbootAutoConfiguration initialized.");
+  }
+}

contrib/spring-boot-starter-adk/src/main/resources/META-INF/spring/org.springframework.boot.autoconfigure.AutoConfiguration.imports

@@ -0,0 +1 @@
+com.google.adk.starters.springboot.AdkSpringbootAutoConfiguration

contrib/spring-boot-starter-adk/src/test/java/com/google/adk/starters/springboot/AdkSpringbootStarterTest.java

@@ -0,0 +1,81 @@
+/*
+ * Copyright 2025 Google LLC
+ *
+ * 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
+ *
+ *     http://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 com.google.adk.starters.springboot;
+
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.get;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.content;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;
+
+import com.google.adk.agents.BaseAgent;
+import com.google.adk.agents.LlmAgent;
+import com.google.adk.web.AgentStaticLoader;
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.boot.test.autoconfigure.web.servlet.AutoConfigureMockMvc;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.test.web.servlet.MockMvc;
+
+/**
+ * Integration tests for the ADK Spring Boot Starter.
+ *
+ * <p>These tests use MockMvc to simulate HTTP requests and verify the expected responses from the
+ * ADK API server, ensuring that the Spring Boot autoconfiguration works correctly.
+ */
+@SpringBootTest(properties = "adk.agents.loader=static")
+@AutoConfigureMockMvc
+public class AdkSpringbootStarterTest {
+
+  @Autowired private AgentStaticLoader agentStaticLoader;
+
+  @Autowired private MockMvc mockMvc;
+
+  @Test
+  void testAgentStaticLoaderIsLoaded() throws Exception {
+    assertNotNull(agentStaticLoader);
+    mockMvc
+        .perform(get("/list-apps"))
+        .andExpect(status().isOk())
+        .andExpect(content().json("[\"test_agent\"]"));
+  }
+
+  @SpringBootApplication
+  public static class TestApplication {
+    public static void main(String[] args) {
+      SpringApplication.run(TestApplication.class, args);
+    }
+  }
+
+  @Configuration
+  public static class AppConfig {
+    @Bean("agentLoader")
+    public AgentStaticLoader agentStaticLoader() {
+      BaseAgent testAgent =
+          LlmAgent.builder()
+              .name("test_agent")
+              .model("gemini-2.0-flash-lite")
+              .description("Test agent for demonstrating AgentStaticLoader")
+              .instruction("You are a test agent.")
+              .build();
+      return new AgentStaticLoader(testAgent);
+    }
+  }
+}

dev/src/main/java/com/google/adk/web/AgentStaticLoader.java

@@ -37,7 +37,7 @@
  * <p>This class is not a Spring component by itself - instances are created programmatically and
  * then registered as beans via factory methods.
  */
-class AgentStaticLoader implements AgentLoader {
+public class AgentStaticLoader implements AgentLoader {
 
   private final ImmutableMap<String, BaseAgent> agents;
 

pom.xml

@@ -31,6 +31,7 @@
     <module>dev</module>
     <module>maven_plugin</module>
     <module>contrib/langchain4j</module>
+    <module>contrib/spring-boot-starter-adk</module>
     <module>tutorials/city-time-weather</module>
   </modules>