Rather than always cast and let things blow up at runtime if the developer gets it wrong, use the required type in the API and highlight any issue at compile time.

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/dbcp/trunk@1547598 13f79535-47bb-0310-9956-ffa450edef68
Remove random " character from Javadoc

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/dbcp/trunk@1547599 13f79535-47bb-0310-9956-ffa450edef68