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Title: fix: retain streamable HTTP session on response write failure by DragonFSKY · Pull Request #972 · modelcontextprotocol/java-sdk · GitHub

Open Graph Title: fix: retain streamable HTTP session on response write failure by DragonFSKY · Pull Request #972 · modelcontextprotocol/java-sdk

X Title: fix: retain streamable HTTP session on response write failure by DragonFSKY · Pull Request #972 · modelcontextprotocol/java-sdk

Description: Fixes #952. Summary Keep the MCP session registered when a request-specific streamable HTTP response write fails. Continue completing the failed request async context without treating the write failure as an explicit session termination. Add a regression test that simulates PrintWriter.checkError() after an SSE response write and verifies a subsequent request using the same session id does not return 404. Verification ./mvnw -pl mcp-test -am -Dtest=HttpServletStreamableSessionFailureTests -Dsurefire.failIfNoSpecifiedTests=false test ./mvnw -pl mcp-test -am -Dtest=HttpServletStreamableSessionFailureTests,HttpServletStreamableSyncServerTests,HttpServletStreamableAsyncServerTests,HttpServletStreamableIntegrationTests -Dsurefire.failIfNoSpecifiedTests=false test ./mvnw -pl mcp-core,mcp-test -am spring-javaformat:validate git diff --check

Open Graph Description: Fixes #952. Summary Keep the MCP session registered when a request-specific streamable HTTP response write fails. Continue completing the failed request async context without treating the write fa...

X Description: Fixes #952. Summary Keep the MCP session registered when a request-specific streamable HTTP response write fails. Continue completing the failed request async context without treating the write fa...

Opengraph URL: https://github.com/modelcontextprotocol/java-sdk/pull/972

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34b2ab7 fix: retain streamable HTTP session on response write failure DragonFSKY May 18, 2026 https://github.com/modelcontextprotocol/java-sdk/pull/972/commits/34b2ab7711a85b2bff77bc5cb0e8498d5ceec596
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