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RMI Registry
RMI Registry is a service used by Java applications to register and look up remote objects within distributed computing environments. It facilitates communication between Java-based client and server applications, enabling seamless invocation of methods across network boundaries..
Overview:
The RMI Registry, running by default on port 1099, is a core component of Java’s Remote Method Invocation (RMI) framework. It serves as a simple name service allowing Java objects to be registered and subsequently looked up across a distributed system. Developers make use of it to locate stubs for remote objects so that method invocations can occur transparently over the network.
How it Works:
The RMI Registry uses a straightforward key-value store approach—remote objects are associated with unique textual names and then bound to the registry. Clients query the registry for these names, receive a stub (proxy object) in return, and then invoke the remote object’s methods as if they were local, with the RMI system handling network communication, marshalling, and unmarshalling behind the scenes.
Protocols and Use Cases:
Port 1099 supports both TCP and UDP protocols, though communication primarily occurs over TCP for reliability. RMI Registry is widely used within Java Enterprise environments, distributed middleware systems, and in legacy enterprise applications that depend on Java EE technologies, especially before the rise of modern microservices and RESTful APIs.