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Return the contained value, if present, otherwise throw an exception to be
created by the provided s
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An iterator over a sequence of objects, such as a collection.If a collection has
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A counting semaphore. Conceptually, a semaphore maintains a set of permits. Each
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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
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