You need to include more info. What platform? What packages do you
have? Did you include the properties file? etc.
On Mon, Apr 6, 2009 at 10:42 AM, giulio <juliu...@alice.it> wrote:
> Hello all,
> I'm new to this library and I've a problem.
> This source code:
>
> import javax.usb.*;
>
> public class maine
> {
> public static void main (String [] args) throws SecurityException,
> UsbException
> {
> UsbServices us=UsbHostManager.getUsbServices(); //line 7
>
> }
> }
>
> on running displays:
>
> Exception in thread "main" java.lang.NullPointerException
> at javax.usb.UsbHostManager.setupProperties(Unknown Source)
> at javax.usb.UsbHostManager.getProperties(Unknown Source)
> at javax.usb.UsbHostManager.createUsbServices(Unknown Source)
> at javax.usb.UsbHostManager.getUsbServices(Unknown Source)
> at maine.main(maine.java:7)
>
> Why?
> (I'm using Eclipse.)
>
> Thanx to who replies me!
>
>
> ------------------------------------------------------------------------------
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> javax-usb-devel mailing list
> javax-usb-devel@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/javax-usb-devel
>
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