Initializing JestClient when application calls multiple Elasticsearch endpoints

My API currently calls one Elasticsearch endpoint using JestClient. I want to add some functionality that requires calling a second, different Elasticsearch endpoint. How is this possible, when you …

How to create a single instance of object across entire Spring MVC web application?

I have a Spring MVC web application (XML based without annotations). I want to create only one instance of statsDClient object on start of my application and use it across my whole application. I am …

In what domain is there a single instance of a Java singleton?

By definition, there can be a single instance of a Java singleton class. Except of course when there’s obviously several, including the same code running on different physical machines, virtual …

Thread Safe Singletons in Java

The wikipedia article on Singletons mentions a few thread safe ways to implement the structure in Java. For my questions, let’s consider Singletons that have lengthy initialization procedures and are …

Singleton using AtomicReference

Is it correct implementation of lazy-initializing singleton using AtomicReference? If no – what are the possible issues? import java.io.ObjectStreamException; import java.io.Serializable; import java….