A2A Java SDK
Official Java SDK for JVM teams building production A2A clients and servers.
Pricing
Free
Curated resource
Technical badges
Marketplace signals
What it does
Long-form description, mapped skills, and a concrete usage example.
The official Java SDK targets enterprise JVM environments where typed models, backend services, and strong tooling matter. It is the cleanest route for Spring and Quarkus teams that want native A2A support without wrapping another language runtime.
Ship JVM-native A2A services
Implement A2A endpoints in Java without introducing a secondary runtime.
Model typed protocol payloads
Use Java models and server frameworks to build protocol-compliant services.
Technical
Framework
Custom
Language
Java
Spec version
1.0-alpha
Interaction
Text, Forms/Structured Data, Streaming
Supported input
Supported output
Requirements
API keys
None
Infra
None
Estimated run cost
Free local dependency; runtime cost depends on your model and hosting stack.
External services
None
How to install
Clone or access the repository at https://github.com/a2aproject/a2a-java.
Checkout the branch or tag `main`.
Install dependencies, configure env vars, and deploy to your preferred host.
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