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How to use an existing Connection with jstl.sql?

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I inherited an old JSP application (very low traffic) that already has a sql Connection object held at the session level. For quick & dirty extension I was thinking of using the JST SQL tags, but has someone built a wrapper that would allow me to use the connection as dataSource? I think one needs to implement the javax.servlet.jsp.jstl.sql.dataSource interface, but I don't know what JAR to include in my project to see that class. Of course any existing implementation would be very welcome. I do *not* want to re-open a new connection for every new query, but to re-use the one available tot the session.
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