Why am I getting a StackOverflowError exception in my constructor

Question

public class Cloning {

    Cloning c=new Cloning();
    public static void main(String[] args) {

        Cloning c=new Cloning();
        c.print();
    }

    public void print(){
        System.out.println("I am in print");
    }

}

In the above code I have a simple class and a class level instance, I also have a local instance with the same name. When running the above code I get below exception :

Exception in thread "main" java.lang.StackOverflowError
    at com.java8.Cloning.<init>(Cloning.java:6)

Answer 1

Your main method creates a Cloning instance (Cloning c=new Cloning();), which causes the initialization of the instance variable c (Cloning c=new Cloning();), which creates another Cloning instance, and so on...

You have an infinite chain of constructor calls, which leads to StackOverflowError.

In the above code I have a simple class and a class level instance

You don't have a class level instance. You have an instance level instance. If you want a class level instance, change

Cloning c=new Cloning();

to

static Cloning c=new Cloning();