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Installed the OpenJDK 8 JRE:
pacman -S jre8-openjdk-headless
The java-rxtx package puts a dependency on the non-headless Java runtime. I force installed it with:
java-rxtx
pacman -Sdd java-rxtx
Then I created the symlink from the JRE manually:
ln -s /usr/share/java/rxtx/RXTXcomm.jar /usr/lib/jvm/java-8-openjdk/jre/lib/ext/RXTXcomm.jar
Then, as the package noted, added user solar to the uucp and lock system groups.
solar
uucp
lock