This week's book giveaway is in the OCAJP 8 forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide and have Edward Finegan & Robert Liguori on-line! See this thread for details.
Why not making a class called Employee, with a name, a salary and an age ? You could then instanciate each employee from the resultset, put it in a List<Employee> and return it. I don't think you need to use HashMap here.