The Java exception thrown when an application attempts to use null in a case where an object is required.
This Java exception is thrown when an application attempts to use null in a case where an object is required.
These include:
- Calling the instance method of a
nullobject. - Accessing or modifying the field of a
nullobject. - Taking the length of
nullas if it were an array. - Accessing or modifying the slots of
nullas if it were an array. - Throwing
nullas if it were aThrowablevalue. - Unboxing of
nullobject.
Applications should throw instances of this exception to indicate other illegal uses of the null object.
It's often abbreviated as NPE
Practically all questions with this tag are duplicates of the canonical What is a NullPointerException and how do I fix it?.
