[aur-general] Java services in systemd

I recently had a problem with a service file of a package in AUR [1]. I already contacted the maintener but we both don't know how to make it work across diferentes providers of java. My java-runtime is provided by jdk [2], it sets JAVA_HOME and adds /opt/java/bin to PATH in the file /etc/profile.d/jdk.sh [3]. But aparently these variables are not set when the service file calls the start script of PMS. Is this behavior expected? If so, how to find out where the java executable is without these variables? [1] https://aur.archlinux.org/packages/pms [2] https://aur.archlinux.org/packages/jdk [3] http://pastebin.com/XpdLcWqj []'s Gabriel