How to close Rxtx serial port?

Question

When retrieving available serial ports using the Rxtx library (see second example), the close() method will block, even if the port has been successfully opened.

How do I set a timeout on the close operation so I won't be stuck? Note that these methods are very poorly documented.

Note that I just found this relevant thread. I'll report back soon.

Update -

Here's another thread. Still no luck yet...