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An exception that indicates a failed JDBC operation. It provides the following
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A map that has its keys ordered. The sorting is according to either the natural
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Timers schedule one-shot or recurring TimerTask for execution. Prefer
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A task that returns a result and may throw an exception. Implementors define a
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General file manipulation utilities. Facilities are provided in the following
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This is the central class in the log4j package. Most logging operations, except
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