Apache Dubbo is a high-performance, java based, open source RPC framework.
The Java gRPC implementation. HTTP/2 based RPC
A fault tolerant, protocol-agnostic RPC system
SOFARPC is a high-performance, high-extensibility, production-level Java RPC framework.
ServiceComb Java Chassis is a Software Development Kit (SDK) for rapid development of microservices in Java, providing service registration, service discovery, dynamic routing, and service management features