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Thrown when a file specified by a program cannot be found.
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Signals a general, I/O-related error. Error details may be specified when
calling the constructor, a
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A counting semaphore. Conceptually, a semaphore maintains a set of permits. Each
#acquire blocks if
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Defines a general exception a servlet can throw when it encounters difficulty.
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This is the central class in the log4j package. Most logging operations, except
configuration, are d
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