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Return the contained value, if present, otherwise throw an exception to be
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Signals a general, I/O-related error. Error details may be specified when
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This class represents proxy server settings. A created instance of Proxy stores
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A connection represents a link from a Java application to a database. All SQL
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Collection is the root of the collection hierarchy. It defines operations on
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Provides an abstract class to be subclassed to create an HTTP servlet suitable
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