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Add a2a module: agent card, tasks, streaming, input-required and agent-to-agent calls on the A2A Java SDK, served over the JDK HTTP server

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Co-Authored-By: Claude Sonnet 5.5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01G8ikz8xdWuTP5yun8DZ1hk
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Claude
2026-10-11 08:35:19 +00:00
parent ec1b076e9b
commit 10545299f8
19 changed files with 1042 additions and 2 deletions
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README.md
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@@ -7,12 +7,14 @@ facts, so the build fails when a claim stops being true.
| Module | Post | What it shows |
|---|---|---|
| `embabel` | Embabel: Goal-Oriented AI Agents on the JVM | actions, goals, conditions and cost-based planning with GOAP, compared with plain Spring AI |
| `a2a` | A2A Protocol in Java: Agents That Talk to Each Other | agent card, tasks, streaming, input-required and agent-to-agent calls with the A2A Java SDK |
## Versions (verified on Maven Central, 2026-10-11)
| Component | Version | Note |
|---|---|---|
| Embabel `embabel-agent-api` | 1.5.3 | brings Spring AI 2.0.1 and Spring Boot 4.1.1 transitively |
| A2A Java SDK `io.github.a2asdk` | 1.0.0.Alpha3 | alpha; targets A2A protocol 1.0. The newest stable release, 0.3.3.Final, targets the 0.3 protocol and its API differs |
| JDK | 25 LTS | |
| JUnit | 6.1.3 | |
@@ -21,9 +23,9 @@ facts, so the build fails when a claim stops being true.
```bash
export JAVA_HOME=/path/to/jdk-25
mvn test # everything
mvn test -pl embabel -am # one module
mvn test -pl a2a -am # one module
```
No API key is needed. The Embabel tests use `ScriptedLlmOperations`, the scripted stand-in shipped inside
No API key is needed. The A2A agents contain no model call, because the protocol is the subject. The Embabel tests use `ScriptedLlmOperations`, the scripted stand-in shipped inside
`embabel-agent-api`, and the Spring AI comparison uses a small scripted `ChatModel`.
Each module writes its transcripts to `<module>/output/` when you run the tests.