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What is a ‘crash’?

The term ‘Crash’ is rather vague, even to programmers. Typically a program is said to have crashed when it has done some or all of the following:

  • stopped working completely, as if it had never started

  • stops responding to user input

  • leaves its data in an unpredictable state

  • produces meaningless displays

  • requires user intervention to recover normal operation

  • leaves the complete system in an unpredictable or inoperable state

The last of these is probably the most annoying for the end user. In a well-designed computer system it should be impossible for the failure of a single program to compromise the operation of the system, but it does sometimes happen. Fortunately, it is almost impossible for a Java program to have such a drastic effect. A Java program can, however, exhibit all the other symptoms of a crash.

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