Integrate your Spring Boot applications with Google's A2A Protocol and Anthropic's Model Context Protocol (MCP) using a2ajava. This integration allows any Spring bean to be exposed as an AI-actionable service—no need for extra annotations or custom wiring.
A2AJava is the Java implementation of the Google A2A protocol you can check the project here .

A2A (Agent-to-Agent) is Google's protocol that enables AI agents to discover and interact with services through a standardized format. It makes services discoverable and executable by AI systems.

MCP (Model Context Protocol) is Anthropic's specification for enabling structured interactions between AI models and external tools/services. It provides a standardized way to define tool interfaces that can be called by AI models, with features like runtime type validation and standardized error handling.

Integrate your Spring Boot applications with Google's A2A Protocol using a2ajava. This integration allows any Spring bean to be exposed as an AI-actionable service—no need for extra annotations or custom wiring.

✅ Key Features

• Auto-discovery of Spring Beans as A2A Actions

• Built-in support for prompt-based execution

• Zero boilerplate integration using @Agent and @Action annotations

• Ideal for building intelligent microservices and AI-enhanced APIs

@Service
@Log
@Agent(groupName ="compareCar", groupDescription = "Provide 2 cars and compare them")
public class CompareCarService implements JavaMethodAction {
    public CompareCarService() {
        log.info("created compare car service");
    }
    private ActionCallback callback;

    @Action(description = "compare 2 cars")
    public String compareCar(String car1 , String car2) {

        log.info(car2);
        log.info(car1);
        // implement the comparison logic here
        if((callback!= null) && (callback.getType().equals(CallBackType.A2A.name()))) {
            log.info("callback is not null");
            ((Task) callback.getContext()).setDetailedAndMessage(TaskState.COMPLETED, "I compared the car and this is better "+car2 );
        }
        return " this is better - "+car2;
    }
}

• A2A card will be available here http://localhost:7860/.well-known/agent.json
• MCP Tools will be available here http://localhost:7860/mcp/list-tools

At runtime spring will create this service and call it with appropriate values if the prompt matches the action

   @Autowired
    private ApplicationContext applicationContext;
    @GetMapping("/action")
    public String actOnPrompt(@RequestParam("prompt") String prompt) {
        SpringAwareActionProcessor processor = new SpringAwareActionProcessor(applicationContext);
        try {
            return (String) processor.processSingleAction(prompt);
        } catch (AIProcessingException e) {
            throw new RuntimeException(e);
        }

    }

mvn clean install

and then mvn spring-boot:run

add agets to the ui

chatting with agent

events being generated

multiple agents in same ui