unable to open device about hid4java HOT 3 CLOSED

Interesting. Your device is declaring itself as a Consumer Audio Control (usage page 0x0C, usage ID 0x01) which is opened by Windows for System use. Here's an article about it.

However the access mode from the system is Shared indicating that it should be possible to open it yourself. Unfortunately, given that it's listed there means that it may not be possible to use hidapi.dll (the underlying HID API that hid4java wraps) and you may need to explore the more direct usb4java alternative.

from hid4java.

Thanks for the help. Man, what a pain this has been! usb4java was a failure, it just didn't work right. Eventually I switched to LibUsbJava and finished my project:
https://github.com/EsotericSoftware/powermate
Here is where the magic happens:
https://github.com/EsotericSoftware/powermate/blob/master/src/powermate/PowerMate.java#L28
Cheers!

from hid4java.

That's good to know and I'm glad you were able to resolve the issue. LibUsbJava is quite an old project (2008 was last release) but at least it worked so no complaints there.

from hid4java.