Could not load JDBC driver class

Beim Versuch eine Datenquelle (engl. datasource) in /WEB-INF/applicationContext.xml meiner Java Enterprise-Anwendung hinzuzufügen, lieferte mir die Ausgabe meines GlassFish Server 3 in NetBeans 6.9.1 diesen Fehler:

org.springframework.beans.factory.BeanCreationException: Error creating bean with name ‚dataSource‘ defined in ServletContext resource [/WEB-INF/applicationContext.xml]: Error setting property values; nested exception is org.springframework.beans.PropertyBatchUpdateException; nested PropertyAccessExceptions (1) are: PropertyAccessException 1: org.springframework.beans.MethodInvocationException: Property ‚driverClassName‘ threw exception; nested exception is java.lang.IllegalStateException: Could not load JDBC driver class [com.mysql.jdbc.Driver]

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