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The mcp-core 2.0.1 release fixes unregistered/unknown JSON-RPC methods returning HTTP 500 on stateless transports instead of a proper JSON-RPC -32601 (Method not found) response (modelcontextprotocol/java-sdk#784, fixed by modelcontextprotocol/java-sdk#800). WebFluxStatelessServerTransport and WebMvcStatelessServerTransport need no code changes of their own: they only return 500 when the handler's Mono errors, and mcp-core 2.0.1 makes the handler return a normal JSONRPCResponse instead. Fixes spring-projects#6998 Signed-off-by: Vadim Shurmialiou <153723461+vdm24@users.noreply.github.com> Co-authored-by: Junie <junie@jetbrains.com>
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Hi @tzolov, The MCP integration tests check failed on the new test inherited from The test expects the server to reject request bodies larger than 2048 bytes with HTTP How would you prefer to handle this for this PR?
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September 16, 2026 08:37
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Bumps
mcp.sdk.versionfrom2.0.0to2.0.1.mcp-core2.0.1 includes the fix for unregistered/unknown JSON-RPC methodsreturning HTTP 500 on stateless transports instead of a proper JSON-RPC
-32601(Method not found) response(modelcontextprotocol/java-sdk#784,
fixed by modelcontextprotocol/java-sdk#800).
WebFluxStatelessServerTransportandWebMvcStatelessServerTransportneed nocode changes of their own: both only return 500 today because the handler's
Monoerrors for an unregistered method, and they.block()it and map anyerror to 500.
mcp-core2.0.1 makes the handler return a normalJSONRPCResponsecarrying-32601instead of erroring, so both transportstake their regular
200 OKsuccess path once the dependency is bumped.Fixes #6998