Distributed computing has gotten stronger than before as it now provides the ability to handle communication over a network with distributed objects. Though there are a number of different ways to create distributed objects across a distributed network, distributed computing is preferred as it provides you the ability to access any component in a distributed system. In this system, the number of resources and the way to access them has enriched with the use of technologies that let you handle distributed objects effectively. The protocol through which these objects can be communicated is an essential concept to understand.

In this chapter, we will cover the following topics:

• Remote Method Invocation (RMI)
• What is RMI?
• Key terminologies of RMI
• RMI for distributed computing
• RMI programming

• Common Object Request Broker Architecture (CORBA)
• CORBA standards
• Inter-ORB communication
• OMG IDL samples
• CORBA services
• CORBA programming

• JavaSpaces
• How Java 9 adds value

Let's start our discussion with RMI. This is where we will establish interaction between applications as per the concept of remotely deployed Java applications.