Yes - I solved it finally!
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It was in deed the RXTX driver - in case somebody runs into the same issue, here is my solution:
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In case you donāt have RXTX, install it with
sudo apt-get install librxtx-java -
edit /etc/default/openhab2 and add to the EXTRA_JAVA_OPTS the path - in my case:
EXTRA_JAVA_OPTS="-Dgnu.io.rxtx.SerialPorts=/dev/ttyACM0 -Djava.library.path=/usr/lib/jni -cp /usr/share/java/RXTXcomm.jar"
Thanks a lot @5iver and @sihui sihui for the help! Your support is really appreciated.