Reduce FindBugs warnings
Use valueOf()

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/dbcp/trunk@1557574 13f79535-47bb-0310-9956-ffa450edef68
Reduce FindBugs warnings
Remove unnecessary null check

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/dbcp/trunk@1557575 13f79535-47bb-0310-9956-ffa450edef68