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What is a Null Pointer Exception?
Java: Why aren't NullPointerExceptions called NullReferenceExceptions ?
Our of idle curiosity, does anyone know why the null reference exception in Java was called NullPointerException?
It seems counterintuitive that in a new language that officially has no pointers a choice would be made to use this name when using a null reference.
If anyone can point me to an authoritative explanation, that would be appreciated.
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What Causes NullPointerException. The NullPointerException occurs due to a situation in application code where an uninitialized object is attempted to be accessed or modified. Essentially, this means the object reference does not point anywhere and has a null value.
In Java, the java. lang. NullPointerException is thrown when a reference variable is accessed (or de-referenced) and is not pointing to any object. This error can be resolved by using a try-catch block or an if-else condition to check if a reference variable is null before dereferencing it.
A NullReferenceException exception is thrown when you try to access a member on a type whose value is null . A NullReferenceException exception typically reflects developer error and is thrown in the following scenarios: You've forgotten to instantiate a reference type.
Exception for of isEmpty() in JavaThe isEmpty() method throws a NullPointerException when the string is initialized to null.
The statement that Java "officially has no pointers" is simply false. Just because you can't do arithmetic on it doesn't mean it's not a pointer. C is not the final authority for programming terminology.
The only people who get hung up over it are either C/C++ fans who want to disparage Java for its lack of power over the bare metal, or (unlikely, nowadays) marketing people who want to sell Java as a simpler, safer alternative to managers who've had bad experiences with C development.
From the Java language specification:
The reference values (often just references) are pointers to these objects, and a special null reference, which refers to no object.
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