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What is this Orchestration : Orchestration is the traditional way of handling interactions between different services in Service-Oriented Architecture (SOA). With orchestration process, there is typically one controller that acts as the “orchestrator” of the overall service interactions. This typically follows a request/response type pattern. For example, if three services needed to be called in a particular order, the orchestrator makes a call to each one, waiting for a response before calling the next. 

To implement Singleton pattern, we have different approaches : 1.Eager initialization: In this method the instance of clss is created at loading time .As whenever in java there is a requirement of species at loading time we first remember of Static keyword. package com.questprogram.singleton; public class EagerInitializedSingleton { private static final EagerInitializedSingleton instance = new EagerInitializedSingleton(); //private constructor to avoid client applications to use constructor private EagerInitializedSingleton(){} public static EagerInitializedSingleton getInstance(){ return instance; } } 2. Static block initialization Static Block initialization implementation is similar to eager initialization, except that instance of class is created in the static block that provides option for exception handling. package com.questprogram.singleton; public class StaticBlockSingleton { private static StaticBlockSingleton in