Java RMI and the Hessian binary web-service format are considered legacy remoting protocols, but they still appear in enterprise codebases that predate REST or in environments where binary efficiency matters more than interoperability. Spring Boot 2 makes both trivially easy to configure through dedicated exporter beans — no XML, no servlet configuration, just a few @Bean declarations. This guide shows you how to expose and consume a service over both protocols with the minimal possible code.

Spring beans are most commonly created through constructors or @Bean factory methods, but there is a third, lesser-known option: static factory methods. When a class uses the factory pattern to control its own instantiation — for example, a connection pool, a registry, or a singleton that validates its configuration at construction time — a static factory method lets Spring call that factory instead of a constructor. This keeps your code idiomatic and avoids adding unnecessary public constructors just to satisfy the IoC container.

Spring MVC is the foundational web layer of the Spring Framework, and it remains a favourite topic in Java developer interviews at every level. Even in a world dominated by Spring Boot auto-configuration, interviewers probe Spring MVC knowledge to gauge whether a candidate truly understands what happens under the hood. This guide covers the 40 most-asked Spring MVC interview questions, organised from core concepts through advanced topics, each with a concise, interview-ready answer.