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.
Set _JAVA_LAUNCHER_DEBUG (you can set it to anything). Then start the app server. The JVM loader will dump some stuff to the console. Make sure that the java.library.path setting gets dumped and that it includes the directory containing you DLL.
If that does not help you resolve the problem, post the full path name for the DLL and post what was output to the console.