autoboxing ,unboxing static variable

//Static variables by default initialized with null,
// which can’t be autoboxing/ autounboxing.Hence RTE    
 class StaticDe
      {
            static Integer I1;  //  not Initialized
            public static void main(String a[])
            {
                m1(I1);      // null pointer exception
            }
            public static void m1(int i)
            {
                 Integer I2=i;  
                System.out.println(I2); 
            }
    }