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-:PROPERTIES:
-:ID:       f346dcfa-5575-4aab-a245-36ff96266611
-:END:
-#+title: NullPointerException
-* NullPointerException
-Thrown when an application attempts to use null in a case where an
-object is required. These include:
-
-- Calling the instance method of a null object.
-- Accessing or modifying the field of a null object.
-- Taking the length of null as if it were an array.
-- Accessing or modifying the slots of null as if it were an array.
-- Throwing null as if it were a Throwable value. 
-
-https://stackoverflow.com/questions/218384/what-is-a-nullpointerexception-and-how-do-i-fix-it
-
-NullPointerExceptions are exceptions that occur when you try to use a
-reference that points to no location in memory (null) as though it were
-referencing an object. Calling a method on a null reference or trying to
-access a field of a null reference will trigger a NullPointerException.
-
-#+begin_src java
-  public class Example {
-    public static void main(String[] args) {
-        Object obj = null;
-        obj.hashCode();
-    }
-}
-#+end_src
-