Replaces Spring's SseEmitter with a custom BlockingQueue-based SSE implementation in
WebMvcSseServerTransport for improved event delivery control and connection management.
The new implementation:
- Uses BlockingQueue for reliable event queuing and delivery
- Adds proper session management with dedicated SSEEvent record
- Improves error handling and timeout management
- Adds comprehensive integration tests
Resolves#57
Split the transport implementations into dedicated modules to improve modularity
and reduce core dependencies.
Added shared test module for common test utilities.
Key changes:
- Create mcp-transport/mcp-webflux-sse-transport module
- Move SseClientTransport → WebFluxSseClientTransport
- Move SseServerTransport → WebFluxSseServerTransport
- Move related tests and utilities
- Create mcp-transport/mcp-webmvc-sse-transport module
- Add new WebMvcSseServerTransport implementation
- Add corresponding tests and integration tests
- Add framework-independent SSE client implementations to core module
- Add FlowSseClient using java.net.http
- Add HttpClientSseClientTransport using java.net.http
- Keep StdioClientTransport/StdioServerTransport in core (no external deps)
- Create mcp-test module for shared test infrastructure
- Move abstract test base classes
- Move shared test utilities and mocks
- Update test dependencies
The modular approach allows users to choose between:
- Framework-specific implementations (WebFlux/WebMVC)
- Pure Java implementations (java.net.http)
- Basic implementations (STDIO)
Add breaking changes readme: 0.5.0-BREAKING-CHANGES.md
Resolves#54
- Make McpSchema final and add private constructor
- Add JsonSchema record for structured schema representation
- Change Tool.inputSchema type from Map<String, Object> to JsonSchema.
- Use the String JSON Schema constructor when creating the Tool programaticaly.
- Enhance StdioClientTransport error logging with more context
- Add ToolHelper utility class for:
- Converting Spring AI FunctionCallbacks to MCP tools
- Generating JSON schemas for tool input validation
- Facilitating integration between Spring AI functions and MCP tools
- Update tests and samples to use the new Tool schema format
Resolves#52
Move Logback dependency to test scope to make it possible for applications using this library to choose their implementation of the SLF4J API. For example, Spring Boot provides one out of the box already.
Fixes gh-49
Signed-off-by: Thomas Vitale <ThomasVitale@users.noreply.github.com>
- Execute tool calls, resource reads and prompt handling in a non-blocking
manner using Schedulers.boundedElastic(). This prevents blocking operations
from impacting server responsiveness.
- Added integration tests to verify non-blocking behavior with tools that
make HTTP calls to external services.
Related to #48
This is a temp patch until #48 is resolved properly.
- Replace Utils.isEmpty check with null check for roots map
- Add specialized error messages for method not found errors
- Extend McpError to include JSONRPCError information
- Add comprehensive tests for roots functionality including:
- Empty roots list handling
- Missing capability scenarios
- Multiple consumers
- Server closure with active subscriptions
- Add proper ListRootsResult wrapping in async client
- Implement paginated listRoots methods in server components
- Fix roots notification handling in async server
- Add roots integration tests
- Update architecture diagram and documentation layout
The changes improve the roots feature implementation with proper result
types, and robust notification handling. Adds thorough
test coverage for roots functionality including async notifications and
root addition/removal scenarios.
Resolves#46
Add comprehensive documentation for the MCP Java SDK implementation
Add architecture diagrams showing layered design and class relationships
Reorganize documentation structure with dedicated pages for:
Overview and introduction
MCP Java SDK reference
Spring AI MCP integration
Include detailed examples and usage patterns for both sync and async APIs
Improves error handling by enforcing sampling handler presence when sampling capabilities are enabled. Adds a builder pattern for CreateMessageResult to improve API ergonomics.
Implement client-side sampling features in the Model Context Protocol (MCP) server:
- Add createMessage method to McpAsyncServer and McpSyncServer for LLM sampling
- Move MockMcpTransport to separate file for reusability
- Add integration tests for sampling functionality
- Test error handling for uninitialized clients and missing capabilities
The sampling implementation allows servers to request LLM completions from
clients while maintaining client-side control over model access and permissions.
Resolves#42
- Implement roots change notification handler in McpAsyncServer
- Add rootsChangeConsumer builder methods to support single and multiple consumers
- Rename info() builder method to serverInfo() for clarity
- Add comprehensive tests for roots change notification functionality
- Add default server info implementation in Builder
Resolves#39
Add getter methods to expose server and client capabilities and implementation
info in McpAsyncClient and McpSyncClient. Store server metadata received during
initialization for later access.
Add getter methods to expose server and client capabilities and implementation
information in both McpAsyncServer and McpSyncServer classes. Store client
metadata received during initialization for later retrieval.
- Add client and server-side logging capabilities with configurable severity levels
- Implement logging message notifications with DEBUG to EMERGENCY levels
- Add logging consumers for client-side log handling
- Update documentation with logging examples and configuration
- Add comprehensive tests for logging functionality
- Fix typo in README.md (notificaiotn -> notification)
- Centralize MCP method names as constants
- Move all JSON-RPC method names to McpSchema class as static constants
- Replace hardcoded method strings with constant references in McpAsyncClient
and McpAsyncServer
- Update test cases to use new method name constants
Resolves#35
- Reorganize McpAsyncServer code into logical sections (Lifecycle, Tool, Resource, Prompt Management)
- (bug) Fix resource registration to use URI instead of name as map key
- Improve error logging in StdioServerTransport with helper methods
- Clean up documentation and add transport mode descriptions
- Update sample server configuration with clearer method names and organization
- Replace bounded elastic schedulers with single thread executors
- Add timeouts to MCP server tests
- Enhance error handling in StdioServerTransport
- Comment out unused PaginatedRequest unmarshalling
- Simplify shutdown logic in StdioServerTransport
Removes custom stream injection capability from StdioServerTransport and
simplifies it to only use System.in/out.
Updates related tests to use System streams instead of piped streams.
- Add isClosing flag to coordinate graceful shutdown
- Synchronize output stream writes to prevent race conditions
- Enhance error handling in stream processing
- Add delay for pending message processing during shutdown
- Improve connection state tracking in tests
