soklet.com

What Is It

Soklet is a zero-dependency Java HTTP + SSE + MCP server, positioned more as a “library” than a full framework. It routes HTTP/1.1 requests to Java methods, lets you build REST APIs with annotation-based handlers, and supports HTTP response streaming, Server-Sent Events, and the Model Context Protocol. It is well suited to lightweight web services and agentic systems.

Core Capabilities and Ecosystem

In terms of features, Soklet emphasizes near-instant startup, immutability/thread safety, a small codebase, automated unit and integration testing, fine-grained telemetry/metrics, static file helpers, CORS, Servlet integration, and production-ready configuration. It does not make choices for developers around JSON, XML, dependency injection, authentication/authorization, or databases. The Toy Store App example shows how these capabilities can be combined. It supports Java, with JDK 17+ required; SSE and MCP require JDK 21+. Distribution options include Maven Central, Gradle, and direct download as a single JAR, with Javadoc and an API Reference also available.

Pricing and Open Source

Soklet is licensed under the Apache 2.0 License, and the text explicitly describes it as commercially friendly open-source software. It has been used in production systems since 2015. No commercial edition, cloud-hosted offering, or paid support pricing is listed, so it can be regarded as a free open-source library. Contributions are handled via GitHub PRs and require signing an electronic contribution agreement.

Pros and Cons

Its strengths are very few dependencies, simple deployment, freedom of technology choices, and a stronger focus on SSE and MCP than many lightweight Java HTTP libraries. The documentation is also fairly complete, covering core concepts, SSE, MCP, testing, metrics, production readiness, and a sample application. The limitations are that it explicitly does not include built-in SSL/TLS, WebSocket, authentication/authorization, or native Reactive Programming support. For teams used to the full Spring Boot ecosystem, some upfront work will be needed to assemble surrounding components themselves.

Who It’s For and Access from China

Soklet is a good fit for Java teams that want controlled dependencies, fast startup, lightweight REST APIs, SSE streaming output, or MCP service exposure. It is also suitable for projects that need to coexist with legacy Servlet code. The text does not provide details on access from China; availability of the domain, GitHub, and Maven Central may depend on the local network environment. Payments are not relevant. If you need a larger ecosystem or more built-in capabilities, alternatives to compare include Spring Boot, Quarkus, Micronaut, Javalin, and Helidon.