Exploring Remote Method Invocation

What is Remote Method Invocation (RMI)?

• Remote Method Invocation (RMI) is a Java API for invoking methods on remote objects in different JVMs.

• A Java library for creating graphical user interfaces.

• A method for invoking local objects in the same JVM.

• A protocol for secure data transmission over the internet.

Explain the role of stubs in RMI.

• Stubs are used to store data locally on the client.

• Stubs in RMI serve as the client-side proxy for remote objects, facilitating method calls and communication with the server.

• Stubs are responsible for managing user sessions in RMI.

• Stubs handle database connections directly on the server.

What are skeletons in the context of RMI?

• Skeletons in RMI are server-side components that process remote method calls.

• Skeletons are data structures used for storing local method calls.

• Skeletons are client-side components that initiate remote method calls.

• Skeletons are network protocols for communication between servers.

How do you define a remote object in Java?

• A remote object is an object that cannot be shared between different applications.

• A remote object is defined by implementing Serializable without any special classes.

• A remote object in Java is an object that can be accessed from another JVM using RMI, defined by extending UnicastRemoteObject and implementing a remote interface.

• A remote object is an object that can only be accessed within the same JVM.

What is the purpose of remote object activation?

• To reduce the need for remote communication.

• To improve network security in local systems.

• The purpose of remote object activation is to enable the creation and use of remote objects in distributed systems.

• To enhance the performance of local applications.

Describe the process of object serialization in Java.

• Object serialization in Java involves saving an object to a database directly without any conversion process.

• In Java, object serialization is the process of converting an object into a byte stream using the Serializable interface and ObjectOutputStream.

• Object serialization in Java is the process of converting a byte stream into an object using the Deserializable interface.

• In Java, object serialization is achieved through the use of the ObjectInputStream only, without the Serializable interface.

What is Java Spaces and how does it relate to RMI?

• Java Spaces is a distributed memory space for Java applications that can use RMI for remote communication.

• Java Spaces is a cloud storage service for Java applications.

• Java Spaces is a programming language similar to Java.

• Java Spaces is a database management system for Java applications.

How does RMI handle network communication?

• RMI communicates using HTTP only.

• RMI uses UDP for communication.

• RMI handles network communication using Java serialization and TCP/IP.

• RMI relies on XML for data transfer.

What are the advantages of using RMI for distributed applications?

• Advantages of RMI include ease of use, seamless integration with Java, support for object-oriented programming, automatic serialization, and built-in security features.

• No security features

• Limited language support

• Complex setup process

Explain the difference between a stub and a skeleton.

• A stub is used for local calls, while a skeleton is for remote calls.

• A stub is a server-side implementation, while a skeleton is a client-side proxy.

• A stub and a skeleton are both used on the client side for handling calls.

• A stub is a client-side proxy for remote calls, while a skeleton is the server-side implementation that handles those calls.