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a2ajava

Java A2A client/server implementation with Spring Boot annotations, WebSockets, and MCP integration.

Pricing

Free

Dev Tools

Curated resource

Technical badges

CustomJava1.0-alpha

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What it does

Long-form description, mapped skills, and a concrete usage example.

a2ajava is one of the most feature-complete community Java implementations around A2A. It supports both client and server roles, uses Spring Boot ergonomics, and automatically exposes built agents as MCP tools.

Run Java A2A clients and servers

Use Spring Boot and annotations for a Java-native implementation.

Expose MCP tools automatically

Map built agents into MCP tooling flows from the same runtime.

Technical

Framework

Custom

Language

Java

Spec version

1.0-alpha

Interaction

Text, Streaming

Supported input

TextJSON

Supported output

TextJSON

MCP servers used

Automatic MCP exposure

Requirements

API keys

None

Infra

None

Estimated run cost

Free library dependency.

External services

None

How to install

Clone or access the repository at https://github.com/vishalmysore/a2ajava.

Checkout the branch or tag `main`.

Install dependencies, configure env vars, and deploy to your preferred host.

Use the repo for a Spring Boot oriented Java A2A stack with client and server support.

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