https://openjdk.java.net/projects/jdk/
https://github.com/openjdk/jdk

 pacman -Qql jre8-openjdk
/usr/lib/jvm/java-8-openjdk/
/usr/lib/jvm/java-8-openjdk/jre/
/usr/lib/jvm/java-8-openjdk/jre/bin/
/usr/lib/jvm/java-8-openjdk/jre/bin/policytool
/usr/lib/jvm/java-8-openjdk/jre/lib/

pacman -Qql jre8-openjdk-headless
/etc/java-8-openjdk/
/usr/lib/jvm/java-8-openjdk/
/usr/lib/jvm/java-8-openjdk/jre/
/usr/lib/jvm/java-8-openjdk/jre/bin/
/usr/lib/jvm/java-8-openjdk/jre/bin/java
/usr/lib/jvm/java-8-openjdk/jre/lib/

pacman -Qql java-runtime-common
/etc/
/etc/profile.d/
/etc/profile.d/jre.csh
/etc/profile.d/jre.sh
/usr/
/usr/bin/
/usr/bin/archlinux-java
/usr/bin/java
/usr/bin/keytool
/usr/bin/orbd
/usr/bin/pack200
/usr/bin/rmid
/usr/bin/rmiregistry
/usr/bin/servertool
/usr/bin/tnameserv
/usr/bin/unpack200
/usr/lib/
/usr/lib/jvm/
/usr/lib/jvm/default
/usr/lib/jvm/default-runtime