⚡ REST vs gRPC in Java: Choosing the Right Communication Style
When building distributed systems in Java, services need to communicate efficiently and reliably. Two of the most common approaches are REST over HTTP and gRPC . While both enable service-to-service communication, they differ significantly in protocol, performance, tooling, and design philosophy. This post compares REST (using Spring Web / WebClient) and gRPC from a Java developer’s perspective, with concrete examples, trade-offs, and guidance on when to choose each. 1. 🌐 REST (HTTP + JSON) REST (Representational State Transfer) is an architectural style built on HTTP semantics. It exposes resources via URLs and uses HTTP verbs such as GET , POST , PUT , and DELETE . Payloads are typically JSON. Key Characteristics Resource-oriented (URLs represent entities) Uses HTTP semantics (status codes, headers, caching) Human-readable JSON payloads Broad ecosystem support (browsers, curl, Postman) Spring REST Controller — Example @RestController @RequestMapping(...