a2a4j
Comprehensive Java implementation of Agent2Agent with server, client, examples, and starter modules.
Pricing
Free
Curated resource
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What it does
Long-form description, mapped skills, and a concrete usage example.
a2a4j is a batteries-included Java implementation of A2A that ships with client, server, examples, and starter modules. It is useful for JVM teams that want a more out-of-the-box structure than a minimal protocol library.
Start Java A2A projects fast
Use starter modules and examples instead of assembling the protocol stack yourself.
Technical
Framework
Custom
Language
Java
Spec version
1.0-alpha
Interaction
Text, Streaming
Supported input
Supported output
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/a2ap/a2a4j.
Checkout the branch or tag `main`.
Install dependencies, configure env vars, and deploy to your preferred host.
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