Bump io.modelcontextprotocol.sdk:mcp from 0.11.2 to 0.12.1

[dependabot]

Bumps io.modelcontextprotocol.sdk:mcp from 0.11.2 to 0.12.1.

Release notes

Sourced from io.modelcontextprotocol.sdk:mcp's releases.

v0.12.0

Release Notes

❗ Breaking Changes

• Re-purposed McpTransportContext to reuse in server and client packages and made immutable - more details below
• Updated (Async|Sync)HttpRequestCustomizer class signatures as part of transport context implementation
• Users relying on template resources in resources/list should migrate to using resources/templates/list

🚀 New Features

Transport Context Support (#522)

• Added McpTransportContext to MCP Clients - Provides a unified API for reading context in which MCP Client requests are issued, regardless of sync/async implementation
• Enhanced HttpRequestCustomizer support - Context is now available to both McpAsyncHttpRequestCustomizer and McpSyncHttpRequestCustomizer
• Improved thread-local handling - Addresses limitations with thread local usage in request customizers
• Breaking Change: Updated signatures for (Async|Sync)HttpRequestCustomizer classes
• Breaking Change: McpTransportContext io.modelcontextprotocol.server -> io.modelcontextprotocol.common package change, void put(String key, Object value), and McpTransportContext copy() method removal.
• Breaking Change: DefaultMcpTransportContext class made package private and changed package to io.modelcontextprotocol.common
• Changed McpTransportContext usage patterns - it is now immutable and can be created via a static factory method McpTransportContext create(Map<String, Object> metadata)

🐛 Bug Fixes

Resource Listing Compliance (#528)

• Fixed resource template filtering - Template resources containing {} parameters are now properly excluded from standard resources/list responses
• MCP Specification compliance - Ensures proper separation between regular resources (resources/list) and resource templates (resources/templates/list)
• Issue: Fixes #319 where template resources were incorrectly appearing in both endpoints

Test Stability Improvements (#535)

• Fixed flaky test - Resolved intermittent failures in HttpClientStreamableHttpTransportErrorHandlingTest

🔧 Testing & Infrastructure Improvements

Resource Cleanup & Test Reliability (#537)

• Enhanced resource management - Added try-finally blocks to guarantee server cleanup on test completion
• Synchronous shutdown - Implemented closeGracefully().block() for proper synchronous shutdown
• Resource leak prevention - Added try-with-resources for client lifecycle management
• Reduced test flakiness - Prevents resource leaks that could cause test instability

Test Performance Optimization (#531)

• Significant performance boost - Static container reuse across all client and transport tests
• ~10x speed improvement - Containerized MCP server is now shared within test classes rather than recreated per test

Docker Infrastructure Updates (#536)

• Updated test dependencies - Upgraded mcp-everything-server Docker image from v2 to v3 across all integration tests

Comprehensive Context Testing (#529)

• Expanded test coverage - Added integration tests for transport context propagation between MCP clients and servers
• Multi-environment testing - Coverage for both Spring WebFlux and WebMVC environments
• Transport type coverage - Tests across stateless, streamable, and SSE transport types
• Context validation - Verifies proper flow of authentication tokens, correlation IDs, and metadata through HTTP headers

... (truncated)

Commits

• e4c1931 Release version 0.12.1
• e94a93a fix: Add null check for response ID to prevent memory leaks
• 210a813 fix: Skip structured output validation for error tool results
• f4380e7 Next development version
• a184a62 Release version 0.12.0
• 681fe7f test: ensure proper resource cleanup in integration tests (#537)
• 2314238 fix: filter template resources from standard resource listing (#528)
• ec4b329 test: upgrade mcp-everything-server to v3 and fix resiliency test race condit...
• 4d779e1 Fix flakey test in HttpClientStreamableHttpTransportErrorHandlingTest (#535)
• 02b8c4b test: Add additional MCP transport context integration tests (#529)
• Additional commits viewable in compare view

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[dependabot]

Superseded by #683.