Effective Java Item 49: Auto boxed type NullPointerException

Seems quite innocuous, but throws NPE

Example 1

   public static void main(String[] args){  
     Boolean b = null;  
     call(b);  
   }  
   
   public static void call(boolean b){  
     System.out.println(b);  
   }  

Example 2

   public static void main(String[] args){  
     Integer i = null;  
     if (i == 42){  
       System.out.println(i);  
     }  
   }