{"passport":{"unfragile":{"@version":"1.0","version":"2026-05","artifact":{"id":"awesome-mcp-declarative-java-sdk","slug":"mcp-declarative-java-sdk","name":"MCP Declarative Java SDK","type":"framework","url":"https://github.com/codeboyzhou/mcp-declarative-java-sdk","page_url":"https://unfragile.ai/mcp-declarative-java-sdk","categories":["mcp-servers"],"tags":[],"pricing":{"model":"open_source","free":true,"starting_price":null},"status":"active","verified":false},"capabilities":[{"id":"awesome-mcp-declarative-java-sdk__cap_0","uri":"capability://tool.use.integration.annotation.driven.mcp.server.definition","name":"annotation-driven mcp server definition","description":"Enables developers to define MCP servers using Java annotations (@McpServer, @Tool, @Resource) rather than manual protocol implementation, automatically generating the underlying MCP protocol handlers and message routing logic. The SDK introspects annotated classes at runtime to build a registry of tools and resources, eliminating boilerplate protocol code while maintaining full MCP specification compliance.","intents":["I want to expose Java methods as MCP tools without writing protocol serialization code","I need to quickly scaffold an MCP server without learning the full MCP specification","I want to define resources and tools declaratively in a single Java class"],"best_for":["Java developers building MCP servers who want minimal framework overhead","teams migrating from REST APIs to MCP without rewriting business logic","developers prototyping MCP integrations rapidly"],"limitations":["Annotation processing happens at runtime, not compile-time, adding ~50-100ms server startup overhead","Limited to Java method signatures — complex nested types require custom serializers","No built-in validation of annotation combinations (e.g., conflicting tool names)"],"requires":["Java 11 or higher","MCP client capable of connecting to local/remote Java servers","Reflection access enabled (standard in most JVM configurations)"],"input_types":["Java annotations on class/method level","method parameters with primitive and object types"],"output_types":["MCP protocol messages (JSON-RPC 2.0)","tool/resource definitions in MCP format"],"categories":["tool-use-integration","code-generation-editing"],"confidence":0.5,"matches":0,"success_rate":0},{"id":"awesome-mcp-declarative-java-sdk__cap_1","uri":"capability://tool.use.integration.zero.dependency.mcp.protocol.implementation","name":"zero-dependency mcp protocol implementation","description":"Provides a minimal MCP protocol stack implemented in pure Java without external dependencies, handling JSON-RPC 2.0 message framing, request/response routing, and bidirectional communication over stdio or network transports. The implementation directly parses and generates MCP protocol messages, managing the state machine for tool invocation, resource access, and server lifecycle events.","intents":["I need an MCP server that doesn't pull in Spring, Jackson, or other heavy frameworks","I want to minimize the dependency footprint for embedded or containerized deployments","I need to understand exactly what protocol code is running in my MCP server"],"best_for":["embedded systems and lightweight deployments where dependency size matters","teams with strict dependency governance policies","developers who need to audit or modify MCP protocol handling"],"limitations":["Manual JSON parsing/generation may be slower than optimized libraries like Jackson for large payloads","No built-in support for streaming responses — all tool outputs must fit in memory","Limited error recovery — malformed MCP messages may cause server crashes without graceful degradation"],"requires":["Java 11 or higher","No external dependencies (only Java standard library)"],"input_types":["JSON-RPC 2.0 messages over stdio or network sockets"],"output_types":["JSON-RPC 2.0 responses","MCP protocol events (tool_call, resource_read, etc.)"],"categories":["tool-use-integration","automation-workflow"],"confidence":0.5,"matches":0,"success_rate":0},{"id":"awesome-mcp-declarative-java-sdk__cap_2","uri":"capability://code.generation.editing.declarative.tool.schema.generation.from.method.signatures","name":"declarative tool schema generation from method signatures","description":"Automatically generates MCP tool schemas (parameter types, descriptions, required fields) by analyzing Java method signatures and optional Javadoc/annotation metadata, converting Java types to JSON Schema format without manual schema definition. The SDK maps primitive types, collections, and custom objects to MCP-compatible schemas, enabling clients to discover and invoke tools with full type information.","intents":["I want MCP clients to automatically discover what parameters my tools accept","I need to keep tool definitions in sync with my Java method signatures","I want to avoid writing separate schema definitions for each tool"],"best_for":["Java developers who want schema-driven tool discovery without duplication","teams building MCP servers where method signatures are the source of truth","rapid prototyping scenarios where schema maintenance overhead is undesirable"],"limitations":["Complex generic types (e.g., Map<String, List<CustomObject>>) may generate verbose or incorrect schemas","No support for conditional schemas or schema composition patterns","Javadoc parsing is optional and fragile — missing or malformed docs result in generic descriptions"],"requires":["Java 11 or higher","Method parameters must use types that map to JSON Schema (primitives, collections, simple POJOs)"],"input_types":["Java method signatures with parameter types and optional Javadoc"],"output_types":["JSON Schema objects describing tool parameters","MCP tool definition messages"],"categories":["code-generation-editing","data-processing-analysis"],"confidence":0.5,"matches":0,"success_rate":0},{"id":"awesome-mcp-declarative-java-sdk__cap_3","uri":"capability://tool.use.integration.resource.definition.and.access.control.via.annotations","name":"resource definition and access control via annotations","description":"Allows developers to declare MCP resources (files, data, endpoints) using @Resource annotations, with optional access control metadata that the SDK enforces at invocation time. Resources are registered in the MCP server's resource registry and made discoverable to clients, with the SDK handling resource URI resolution and access validation before delegating to handler methods.","intents":["I want to expose files or data as MCP resources without manual URI routing","I need to control which clients can access which resources","I want resources to be discoverable and queryable by MCP clients"],"best_for":["developers building MCP servers that expose file systems or data repositories","teams needing fine-grained access control over resource access","scenarios where resource discovery is important for client integration"],"limitations":["Access control is enforced at the SDK level, not at the OS/filesystem level — requires trust in the Java process","No built-in support for resource versioning or change notifications","Resource URIs are simple strings — no support for hierarchical or parameterized URIs"],"requires":["Java 11 or higher","@Resource annotation on methods or classes"],"input_types":["Resource URI strings from MCP clients"],"output_types":["Resource content (text, binary, or structured data)","Resource metadata (MIME type, size, access permissions)"],"categories":["tool-use-integration","safety-moderation"],"confidence":0.5,"matches":0,"success_rate":0},{"id":"awesome-mcp-declarative-java-sdk__cap_4","uri":"capability://tool.use.integration.stdio.and.network.transport.abstraction","name":"stdio and network transport abstraction","description":"Provides pluggable transport implementations for MCP communication over stdio (for Claude Desktop integration) and network sockets (TCP/Unix domain sockets), abstracting the underlying I/O details behind a common interface. The SDK handles message framing, buffering, and connection lifecycle management for each transport type, allowing developers to switch transports without changing server code.","intents":["I want my MCP server to work with Claude Desktop via stdio","I need to expose my MCP server over a network for remote clients","I want to support multiple transport types without duplicating server logic"],"best_for":["developers building MCP servers for Claude Desktop and other stdio-based clients","teams deploying MCP servers in containerized or distributed environments","scenarios requiring both local (stdio) and remote (network) access"],"limitations":["Stdio transport is inherently single-client (one connection per process) — no multiplexing","Network transport requires manual TLS configuration — no built-in encryption","No automatic reconnection or failover logic for network transports"],"requires":["Java 11 or higher","For stdio: standard input/output streams available","For network: open network ports and firewall configuration"],"input_types":["JSON-RPC 2.0 messages from stdio or network sockets"],"output_types":["JSON-RPC 2.0 messages to stdio or network sockets"],"categories":["tool-use-integration","automation-workflow"],"confidence":0.5,"matches":0,"success_rate":0},{"id":"awesome-mcp-declarative-java-sdk__cap_5","uri":"capability://tool.use.integration.tool.invocation.with.automatic.parameter.deserialization","name":"tool invocation with automatic parameter deserialization","description":"Automatically deserializes MCP tool invocation requests into Java method parameters, handling type conversion from JSON to Java types (primitives, objects, collections) and invoking the annotated method with deserialized arguments. The SDK manages error handling, type validation, and response serialization, returning results in MCP-compatible format.","intents":["I want MCP clients to invoke my Java methods without manual JSON parsing","I need automatic type conversion from JSON parameters to Java types","I want errors during tool invocation to be reported back to the client gracefully"],"best_for":["Java developers building MCP servers with complex tool signatures","teams wanting to minimize boilerplate around parameter handling","scenarios with diverse parameter types (primitives, objects, collections)"],"limitations":["Type conversion errors may be opaque to developers — no detailed error messages for failed deserialization","No support for custom deserializers — limited to standard Java types","Large parameter objects may cause memory overhead during deserialization"],"requires":["Java 11 or higher","Tool methods must have parameters with types that map to JSON Schema"],"input_types":["JSON objects representing tool parameters from MCP clients"],"output_types":["Java method return values (primitives, objects, or void)","MCP tool result messages"],"categories":["tool-use-integration","data-processing-analysis"],"confidence":0.5,"matches":0,"success_rate":0},{"id":"awesome-mcp-declarative-java-sdk__cap_6","uri":"capability://automation.workflow.server.lifecycle.management.and.initialization","name":"server lifecycle management and initialization","description":"Manages MCP server startup, shutdown, and resource initialization through lifecycle hooks and annotations, handling transport setup, tool/resource registration, and graceful shutdown. The SDK provides hooks for custom initialization logic (e.g., database connections, configuration loading) and ensures proper cleanup on shutdown.","intents":["I want to initialize resources (database connections, config) when my MCP server starts","I need to clean up resources gracefully when the server shuts down","I want to manage server state without writing boilerplate initialization code"],"best_for":["developers building stateful MCP servers that require initialization","teams needing reliable resource cleanup and shutdown handling","scenarios with complex startup sequences (config loading, database setup)"],"limitations":["No built-in support for hot-reloading or dynamic reconfiguration","Shutdown hooks are synchronous — long-running cleanup may block server termination","No automatic retry logic for failed initialization"],"requires":["Java 11 or higher","Lifecycle hook methods annotated with @OnInit, @OnShutdown, or similar"],"input_types":["Configuration objects, environment variables"],"output_types":["Initialized server state, registered tools/resources"],"categories":["automation-workflow","tool-use-integration"],"confidence":0.5,"matches":0,"success_rate":0},{"id":"awesome-mcp-declarative-java-sdk__cap_7","uri":"capability://safety.moderation.error.handling.and.exception.mapping.to.mcp.responses","name":"error handling and exception mapping to mcp responses","description":"Automatically catches exceptions thrown by tool methods and maps them to MCP error responses with appropriate error codes and messages, preserving stack traces for debugging while sanitizing sensitive information. The SDK provides customizable error handlers and supports both built-in and custom exception types.","intents":["I want tool errors to be reported back to MCP clients in standard format","I need to handle different exception types with different error responses","I want to prevent sensitive error details from leaking to clients"],"best_for":["developers building production MCP servers that need robust error handling","teams with security requirements around error message sanitization","scenarios with diverse error conditions (validation, I/O, business logic)"],"limitations":["Error mapping is static — no support for dynamic error handling based on runtime context","Stack traces are logged but not sent to clients — limited debugging info for remote clients","No built-in support for error recovery or retry logic"],"requires":["Java 11 or higher","Exception types that should be mapped to MCP errors"],"input_types":["Exceptions thrown by tool methods"],"output_types":["MCP error response messages with error codes and descriptions"],"categories":["safety-moderation","tool-use-integration"],"confidence":0.5,"matches":0,"success_rate":0},{"id":"awesome-mcp-declarative-java-sdk__cap_8","uri":"capability://tool.use.integration.multi.tool.server.composition.and.namespacing","name":"multi-tool server composition and namespacing","description":"Supports defining multiple tools and resources in a single MCP server, with optional namespacing to avoid naming conflicts and organize tools logically. The SDK manages tool registration, discovery, and routing for all defined tools, allowing developers to compose complex servers from multiple tool definitions.","intents":["I want to organize multiple tools into logical groups or namespaces","I need to avoid tool name conflicts when combining tools from different sources","I want clients to discover all available tools in my server"],"best_for":["developers building multi-purpose MCP servers with many tools","teams integrating tools from multiple sources or teams","scenarios requiring tool organization and discovery"],"limitations":["Namespacing is optional and not enforced — developers must manually manage naming","No built-in support for tool versioning or deprecation","Tool discovery is flat — no hierarchical organization beyond namespaces"],"requires":["Java 11 or higher","Multiple @Tool or @Resource annotations in the same server"],"input_types":["Tool and resource definitions from multiple sources"],"output_types":["Unified tool/resource registry accessible to MCP clients"],"categories":["tool-use-integration","automation-workflow"],"confidence":0.5,"matches":0,"success_rate":0},{"id":"awesome-mcp-declarative-java-sdk__cap_9","uri":"capability://tool.use.integration.mcp.client.integration.and.request.response.handling","name":"mcp client integration and request/response handling","description":"Provides utilities for building MCP clients that communicate with MCP servers, handling request serialization, response deserialization, and bidirectional message exchange. The SDK abstracts the MCP protocol details, allowing client code to invoke tools and access resources using high-level Java APIs.","intents":["I want to build a Java client that invokes tools on remote MCP servers","I need to handle MCP protocol details without manual JSON parsing","I want to integrate MCP servers into my Java applications"],"best_for":["Java developers building applications that consume MCP servers","teams integrating MCP into existing Java systems","scenarios requiring programmatic access to MCP tools and resources"],"limitations":["Client API is less mature than server API — fewer convenience methods","No built-in support for concurrent tool invocations — requests are serialized","Error handling is basic — limited information about remote server errors"],"requires":["Java 11 or higher","Network connectivity to MCP server (for network transports)"],"input_types":["Tool names, parameters, resource URIs"],"output_types":["Tool results, resource content, error messages"],"categories":["tool-use-integration","data-processing-analysis"],"confidence":0.5,"matches":0,"success_rate":0}],"trust":{"score":28,"verified":false,"data_access_risk":"high","permissions":["Java 11 or higher","MCP client capable of connecting to local/remote Java servers","Reflection access enabled (standard in most JVM configurations)","No external dependencies (only Java standard library)","Method parameters must use types that map to JSON Schema (primitives, collections, simple POJOs)","@Resource annotation on methods or classes","For stdio: standard input/output streams available","For network: open network ports and firewall configuration","Tool methods must have parameters with types that map to JSON Schema","Lifecycle hook methods annotated with @OnInit, @OnShutdown, or similar"],"failure_modes":["Annotation processing happens at runtime, not compile-time, adding ~50-100ms server startup overhead","Limited to Java method signatures — complex nested types require custom serializers","No built-in validation of annotation combinations (e.g., conflicting tool names)","Manual JSON parsing/generation may be slower than optimized libraries like Jackson for large payloads","No built-in support for streaming responses — all tool outputs must fit in memory","Limited error recovery — malformed MCP messages may cause server crashes without graceful degradation","Complex generic types (e.g., Map<String, List<CustomObject>>) may generate verbose or incorrect schemas","No support for conditional schemas or schema composition patterns","Javadoc parsing is optional and fragile — missing or malformed docs result in generic descriptions","Access control is enforced at the SDK level, not at the OS/filesystem level — requires trust in the Java process","builder identity is not verified yet","no observed match outcomes yet"],"rank_breakdown":{"adoption":0.05,"quality":0.45,"ecosystem":0.39999999999999997,"match_graph":0.25,"freshness":0.52,"weights":{"adoption":0.3,"quality":0.2,"ecosystem":0.15,"match_graph":0.23,"freshness":0.12}},"observed_outcomes":{"matches":0,"success_rate":0,"avg_confidence":0,"top_intents":[],"last_matched_at":null},"maintenance":{"status":"active","updated_at":"2026-06-17T09:51:03.578Z","last_scraped_at":"2026-05-03T14:00:18.053Z","last_commit":null},"community":{"stars":null,"forks":null,"weekly_downloads":null,"model_downloads":null,"model_likes":null}},"distribution":{"claim_url":"https://unfragile.ai/submit?claim=mcp-declarative-java-sdk","compare_url":"https://unfragile.ai/compare?artifact=mcp-declarative-java-sdk"}},"signature":"CgMsG/3KcvI1PnUQZt+MslPBcemqykIqd+wWv5sKZWwhIqSapEbuas/3JXuxifDkDdchNYQ2Uw7INNGouEeMAg==","signedAt":"2026-06-21T04:36:08.144Z","signedBy":"unfragile.ai","version":1},"_links":{"self":"https://unfragile.ai/api/v1/passport/mcp-declarative-java-sdk","artifact":"https://unfragile.ai/mcp-declarative-java-sdk","verify":"https://unfragile.ai/api/v1/verify?slug=mcp-declarative-java-sdk","publicKey":"https://unfragile.ai/api/v1/trust-passport-public-key","spec":"https://unfragile.ai/trust","schema":"https://unfragile.ai/schema.json","docs":"https://unfragile.ai/docs"}}