Exception

The representation of an unexpected situation that affects control flow.

Related concepts:  ObjectControl FlowReturn

Closest Wikipedia entry:  Exception handling — In computing and computer programming, exception handling is the process of responding to the occurrence of exceptions – anomalous or exceptional conditions requiring special processing – during the execution of a program. In general, an exception breaks the normal flow of execution and executes a pre-registered exception handler; the details of how this is done depend on whether it is a hardware or software exception and how the software exception is implemented. Exceptions are defined by different layers of a computer system, and the typical layers are CPU-defined interrupts, operating system (OS)-defined signals, programming language-defined exceptions.

Misconceptions about Exception

9 documented Misconceptions

AccessingInexistentPropertyError — JavaScript

Accessing a non existent property on an object produces an error

AnyClassException — Java

Any class can be an exception class

CatchAlwaysExecutes — Java

Catch blocks always get executed

CatchProvidesOptions — Java

Only the necessary part of a catch block executes

ExceptionRoot — Java

Exception is the top-most exception class

NullPointerExceptionCompileTime — Java

NullPointerExceptions are detected at compile time

RuntimeExceptionChecked — Java

RuntimeExceptions are checked exceptions

TryCatchMandatory — Java

If code could throw an exception, you must surround that code with a try/catch block

TryFinishes — Java

Exceptions get thrown at the end of the try block