public class ConstructorCls {
 private ConstructorCls obj=new ConstructorCls();
}

public class TestC {

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

Exception in thread "main" java.lang.StackOverflowError
at com.ConstructorCls.<init>(ConstructorCls.java:7)
at com.ConstructorCls.<init>(ConstructorCls.java:7)
at com.ConstructorCls.<init>(ConstructorCls.java:7)

public class ConstructorCls {
 private static ConstructorCls obj=new ConstructorCls(); 
}

public class TestC {

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