A2A Java SDK for Spring Framework

This is the integration of the A2A Java SDK for Spring framework web servers. Including server, Spring Boot auto-configuration, Spring AI tools, and Spring AI examples.

This implementation is aligned with A2A Protocol Specification 1.0.0.

For more information about the A2A protocol, see here.

Getting Started

To use the A2A Java SDK in your Spring Boot application, you will need to package it as a .jar file by using supported spring-boot-autoconfigure projects.

Packaging your Spring Boot application

The key to enabling A2A in your Java application is to correctly package it. Here are the general steps you need to follow:

1. Manage Dependencies:

   • Using the Spring Boot autoconfigure:

       {
           dependencies {
               implementation("io.github.goodfriend2ks:spring-a2a-server:${property("a2aSdkSpringVersion")}")
               implementation("io.github.goodfriend2ks:spring-a2a-server-autoconfigure:${property("a2aSdkSpringVersion")}")
           }
       }

   • (Optional) Using the Spring Boot autoconfigure for Spring AI supported Agent skill:

       {
           dependencies {
               implementation("io.github.goodfriend2ks:spring-ai-a2a-tool:${property("a2aSdkSpringVersion")}")
               implementation("io.github.goodfriend2ks:spring-ai-a2a-server-autoconfigure:${property("a2aSdkSpringVersion")}")
           }
       }

   • (Optional) Using the GRPC Spring Boot autoconfigure to support GRPC protocol:

       {
           dependencies {
               implementation("org.springframework.grpc:spring-grpc-server-spring-boot-starter:${property("springGrpcVersion")}")
           }
       }

2. Provide implementations for AgentExecutor and AgentCard: The A2A SDK requires you to provide your own implementations of the AgentExecutor and AgentCard interfaces.

   2.1. Implementation for AgentCard:

   • Option 1: Implement your own skills for your agent. You can find more information about them in the A2A Java SDK documentation. See examples in spring-ai-a2a-examples/java/v1
   • Option 2: Using Spring Boot autoconfigure for Spring AI supported Agent Skills: See examples in spring-ai-a2a-examples/java/v2.

   2.2. Implementations for AgentExecutor:

   • Option 1: Implement your own AgentExecutor. You can find more information about them in the A2A Java SDK documentation.
   • Option 2: Use default AgentExecutor implementation and implement AgentExecutorHandler to provide your agent business logic.

3. Manage Configurations:

   spring:
     ai:
       a2a:
         server:
           enabled: true
           host: "*"
           ssl: false
           grpc:
             enabled: false
           jsonrpc:
             enabled: false
           rest:
             enabled: false

Examples

There are two version of Spring Boot application examples with Spring AI (in spring-ai-a2a-examples folder):

1. Version 1: Provide example that implement own skills for AI agent
2. Version 2: Provide example that using auto-generate agent skills for AI agent via AgentSkill and SkillAction annotations.