PortInUseException - Java Serial Communication

Question

I’m developing an application for serial communication in Java with RXTX.

Now I’m getting an error:

Port already in use: gnu.io.PortInUseException: Unknown Application

while opening a port, but it seems the port is not used by any other application.

Answer 1

In MS Windows you must reboot system after disabling COM-port and then enable them again (no second reboot needed).