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A connection represents a link from a Java application to a database. All SQL
statements and results
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A plug-in replacement for JDK1.5 java.util.concurrent.ConcurrentHashMap. This
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Patterns are compiled regular expressions. In many cases, convenience methods
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Defines a general exception a servlet can throw when it encounters difficulty.
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A border layout lays out a container, arranging and resizing its components to
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