Why are remote objects built with Java RMI usually registered in a registry?

Remote objects built with Java RMI are usually registered in a so called “registry”. Why? Activation is a technology used to load remote objects into a server on demand (i.e. when a client invokes a method on this object.

Why is registry made in Java RMI?

The registry is typically used to locate the first remote object on which an application needs to invoke methods. That object in turn will provide application-specific support for finding other objects. The methods of the java. rmi.

What is RMI registry and why is it required?

RMI registry is a namespace on which all server objects are placed. To invoke a remote object, the client needs a reference of that object. At that time, the client fetches the object from the registry using its bind name (using lookup() method).

How does the communication with remote objects occur in RMI?

RMI uses stub and skeleton object for communication with the remote object. The stub is an object, acts as a gateway to the client. It resides the client and acts as a proxy for the remote object. The skeleton is an object, acts as a gateway to the server.

Why a registry is used in a remote method invocation?

When a client wants access to a remote object it looks up the object, by its name, in the registry. Then the client can invoke methods on the remote object at the server.

What is registry in Java?

Registry is a remote interface to a simple remote object registry that provides methods for storing and retrieving remote object references bound with arbitrary string names.

How does RMI communicate with the remote object?

The RMI provides remote communication between the applications using two objects stub and skeleton….skeleton

1. It reads the parameter for the remote method.
2. It invokes the method on the actual remote object, and.
3. It writes and transmits (marshals) the result to the caller.

What is remote interface in RMI?

In RMI, a remote interface is an interface that declares a set of methods that may be invoked from a remote Java virtual machine. A remote interface must at least extend, either directly or indirectly, the interface java. rmi.

What is meant by remote object reference and remote reference?

Two fundamental concepts of the distributed object model : Remote object reference: Other objects can invoke the methods of a remote object if they have access to its remote object reference. Remote interface: Every remote object has a remote interface that specifies which of its methods can be invoked remotely.