openHAB crashing with out of memory exception (Sonos, 1.7.1)

I can control volume, play back sound files and start a radio station.
I cannot get anything back from the sonos.
This is a disadvantageous because I cannot read out the volume and therefore I cannot really restore the state the sonos speaker had before I had applied a command.

this was my post:

So if you have good results with the forked Jupnp, I would be interested in trying it.