Can you figure out what was the problem in this simple 3 liner code?

Question

Hello, below is a class to demonstrate a problem I see that I can't understand. I create an instance of the enclosing
class at class level, another instance in static main method. Class below fails at run time with stack overflow exception. It's all fine if one of those two instantiation steps is removed, What is wrong can anyone any ideas?
public class App
// create instance of this class     
App app = new App();
public static void main( String[] args )
     // create instance of this class again.
App app2 = new App();
System.out.println( "Hello World!" );
}

Answer 1

As soon as a new instance of 'App' is created, 'App app = new App();' is called, which calls 'App app = new App();' etc. Hence the stack overflow.
When you remove 'App app = new App();', obviously, the stack overflow does not occur. And when your remove 'App app2 = new App();' the 'App' class is never instantiated and therefore, the exception is also not thrown.