Java Programming

Hi

I'm trying to write an application to open a cash drawer.
It is a Posiflex USB Cash Drawer model: CR 1405.

A usb driver (usbcr.dll) has been provided.

From the Programmers manual it seem's straight forward

The driver "USBCR.DLL" provides 7 function calls: 
The 1--5 functions are for CR-4XX5-II series to use.
The 6--7 functions are for CR-4XX5 series to use.
The examples of Visual Basic are list below.


1. Public Declare Function OpenUSBcr LIB "usbcr.dll" () As Long
			   =========
	' must be called before calling other functions
	' return 0 on success


2. Public Declare Function CloseUSBcr Lib "usbcr.dll" () As Long
			   ==========
	' call this function before exiting your program
	' return 0 on success


3. Public Declare Function DrawerOpen Lib "usbcr.dll" (ByVal ID As Long) As Long
			   ==========
	' return 0 on sending commands successfully, -1 on error
	' 'ID' is the drawer number from 0 to 7


4. Public Declare Function DrawerState Lib "usbcr.dll" (ByVal ID As Long) As Long
			   ===========
	' return the drawer status
	' high nibble is the drawer ID, and 
	' low nibble is 0 if drawer is open, 1 if drawer is closed
	' return -1 on error


5. Public Declare Function RetrieveStatistics Lib "usbcr.dll" (ByVal ID As Long, ByVal idx As Long, ByRef buf As Any, ByVal size As Long) As Long
			   ==================
	' return 0 on sending commands successfully, -1 on error
	' 'size' is the number of bytes which can be held by 'buf'
	' 'buf' will hold the value read from memory in cash drawer
	' This function used to Retrieve the device statistics of Unified POS1.8.

6. Public Declare Function OpenUSB Lib "usbcr.dll" () As Long
			   =======
	' must be called before calling other functions
	' return 0 on success
	' This function is for CR-4xx5 Series to use,
	' and it can drive CR-4xx5-II too.

	
7. Public Declare Function CloseUSB Lib "usbcr.dll" () As Long
			   ========
	' call this function before exiting your program
	' return 0 on success
	' This function is for CR-4xx5 Series to use.
	' and it can drive CR-4xx5-II too.

From the test application, I deduced the drawer id is 7, using the native methods and load libraries I get expceptions

	//public native long OpenUSB();
	//public native long CloseUSB();
	public native long DrawerOpen();
	//public native long DrawerState();
	//public native long RetrieveStatistics(long ID, long idx, String buf , long size);
	
	static {

		System.loadLibrary("USBCR");
	}
	
	public static void main(String[] args) {
		USBCR d = new USBCR();
		 d.DrawerOpen();
		System.out.println("test");
	}

I receive the following exception
Exception in thread "main" java.lang.UnsatisfiedLinkError: USBCR.DrawerOpen(J)J
at USBCR.DrawerOpen(Native Method)
at USBCR.main(USBCR.java:18)


I compiled using javac, then javah -jni and ran with java.

Any advice on what is happening?
Am I on the right path? Completely of the mark? Any help would be greatly appreciated.