If the different versions JDBC driver have the same classnames, then whichever classes are loaded first are used. Since JDBC provider classes are loaded by a WebSphere Application Server classloader, if you define JDBC providers that use different JDBC drivers of the same family (for example, both Oracle 10g and Oracle 11g thin driver), then which JDBC driver gets loaded is determined by which JDBC provider is processed first by the WebSphere Java™ Virtual Machine (JVM).
For example, if you define one JDBC provider to use driver for Oracle 10g and another JDBC provider to use Oracle 11g, and define two datasource's, one using each JDBC provider. The SystemOut.log file will show that both datasources are using the same driver.
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