Apache ServiceComb Java Chassis is a comprehensive microservices framework for Java, providing service registration/discovery, RPC invocation (over REST, Highway, WebSocket), dynamic load balancing, circuit breaker, retry, rate limiting, and other governance capabilities. It follows a modular, SPI-based architecture with strong OpenAPI/Swagger integration for API contract generation. The framework supports multiple service registry backends (ServiceCenter, Nacos, Consul, etcd, ZooKeeper, local/lightweight) and is primarily used as a library within Spring Boot applications. The repository includes extensive demo modules for various transport, registry, and governance combinations, serving both as integration tests and example code. It is not a data or research project; all data flows are operational (configuration, metrics, tracing).