This week's book giveaway is in the OO, Patterns, UML and Refactoring forum. We're giving away four copies of Refactoring for Software Design Smells: Managing Technical Debt and have Girish Suryanarayana, Ganesh Samarthyam & Tushar Sharma on-line! See this thread for details.
Note that to call those functions, they need to have a specific format. You can't easily call arbitrary functions in any DLL from Java; you might need to make your own adapter DLL, that you can call from Java, and that will then call functions in the DLL you want to use.