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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
+