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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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ObjectMapper provides functionality for reading and writing JSON, either to and
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Thrown when a hostname can not be resolved.
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An iterator over a sequence of objects, such as a collection.If a collection has
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A java.util.Queue that additionally supports operations that wait for the queue
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A task that returns a result and may throw an exception. Implementors define a
single method with no
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