NullPointerException is thrown when an application attempts to use null in a case where an object is required. NullPointerException extends RuntimeException. This exception will be thrown when one of the following conditions is met:
- A null object of an instance method has been called.
- The field of a null object has been accessed or modified.
- The length of null in an array has been taken.
- The slots of null in an array have been accessed or modified.
- Null is thrown as if it were a Throwable value.
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