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.
If the dll is one that you wrote and contains native java methods, then all you need do is call System.loadLibrary("MyDllName"). And, yes, it is better to have your native funtions in a separate class, NOT the .jsp. However, if the .dll is some oher (non-Java) .dll, what you need to do is write a java class with native methods that "wrap" the methods of the .dll that you want to call. So, if the .dll that you want has an "authorize" method, you would need to 1). write a java class with a native authorize method, 2). compile the java code, 3). use javah to come up with a .h file for your class, 4). write the corresponding C code that loads the target dll and calls the authorize method, 5). and (finally) compile the C code into a dll. Then in your program, you call System.loadLibrary("MyDllName"), ad then call the "authorize" method in the java class that you wrote. If it sounds complicated, it is. JNI is not an easy topic. You can find an on-line tutorial here
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