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Add mcp-sdk-plain module: MCP server on the plain Java SDK 2.1.0 over stdio and Streamable HTTP, fat jar, wire transcripts and a Spring AI client

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Co-Authored-By: Claude Sonnet 5.5 <[email protected]>
Claude-Session: https://claude.ai/code/session_017ic4b5oh78z7gcH6QkxafF
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Claude
2026-11-08 18:28:07 +00:00
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README.md
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| `adk` | Google ADK for Java: Your First Multi-Agent App | two `LlmAgent`s in a `SequentialAgent`, a tool call, session state handed from one agent to the next, with a scripted stand-in model |
| `code-review-bot` | Build an AI Code-Review Bot in Java | a signed-webhook receiver, a diff chunker, a Spring AI reviewer with a cache and a chunk cap, and a guard that drops comments on lines the model invented |
| `agentic-patterns` | Agentic Patterns in Spring AI: Routing, Orchestrator-Workers, Evaluator-Optimizer and Parallelization | Anthropic's five workflows as plain `ChatClient` code, tested offline with a scripted `ChatModel` that records every prompt, with failure modes and a calls-and-stages cost table |
| `mcp-sdk-plain` | Write an MCP Server with the Plain MCP Java SDK (No Spring): stdio and Streamable HTTP | tools, a resource and a resource template on the framework-free SDK, a fat jar over stdio and Streamable HTTP, wire-level transcripts, and a Spring AI client connecting to it |
## Versions (verified on Maven Central, 2026-10-11)
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| LangGraph4j `org.bsc.langgraph4j:langgraph4j-core` | 1.9.5 | verified on Maven Central 2026-10-14; `langgraph4j` module only |
| Google ADK `com.google.adk:google-adk` | 1.11.0 | verified on Maven Central 2026-10-14; `adk` module only; no Gemini key needed |
| Spring AI `spring-ai-client-chat` | 2.0.1 | `code-review-bot` only; GA, with 2.1.0-M1 a milestone as of 2026-10-14 |
| MCP Java SDK `io.modelcontextprotocol.sdk:mcp` | 2.1.0 | verified on Maven Central 2026-11-08; `mcp-sdk-plain` only; pom-only aggregator over `mcp-core` and `mcp-json-jackson3` |
| Jetty `jetty-ee11-servlet` | 12.1.14 | `mcp-sdk-plain` only; the SDK declares the servlet API as `provided`, so HTTP needs a container |
| Spring Boot / Spring AI (client example) | 4.1.2 / 2.0.2 | `mcp-sdk-plain/examples/spring-ai-client` only, a standalone project |
| JDK | 25 LTS | |
| JUnit | 6.1.3 | |