为什么这个程序会出现StackFlowException 呢

 public class CodeBlockDemo {

    static CodeBlockDemo cbd;
    CodeBlockDemo scb = new CodeBlockDemo();
    static {
        cbd = new CodeBlockDemo();
        int a = 1;
        System.out.println("hot");
        System.out.println(a);
    }

    CodeBlockDemo(){
        System.out.println("构造器");
    }
    public static void main(String[] args) {
        int[] a = new int[] {1,2,3,4};
        Object b =a;
        Object m = new int[] {2,3,4};
        Object[] element = new Integer[] {2,3,4};
        Object[] arr = {};

    }

}