13 Facts About 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.

Exception handling, if provided, is facilitated by specialized programming language constructs, hardware mechanisms like interrupts, or operating system inter-process communication facilities like signals.

An exception handling mechanism allows the procedure to raise an exception if this precondition is violated, for example if the procedure has been called on an abnormal set of arguments.

Exception handling solves the semipredicate problem, in that the mechanism distinguishes normal return values from erroneous ones.

Exception handling was widely adopted by many programming languages from the 1980s onward.

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Exception handling backed this statement with experience from several operating systems.

Microsoft's 32-bit Structured Exception Handling uses this approach with a separate exception stack.

The idea is to provide a more rigorous basis for exception handling by defining precisely what is "normal" and "abnormal" behavior.

Part of designing a solid exception handling strategy is recognizing when a process has failed to the point where it cannot be economically handled by the software portion of the process.

Point of exception handling routines is to ensure that the code can handle error conditions.

One of the most difficult types of software for which to write exception handling routines is protocol software, since a robust protocol implementation must be prepared to receive input that does not comply with the relevant specification.

Condition Exception handling moreover provides a separation of mechanism from policy.

Exception handling is often not handled correctly in software, especially when there are multiple sources of exceptions; data flow analysis of 5 million lines of Java code found over 1300 exception handling defects.