/usr/share/app-install/desktop/openjdk-8-jre:openjdk-8-java.desktop is in app-install-data 15.10.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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X-AppInstall-Package=openjdk-8-jre
X-AppInstall-Popcon=13
X-AppInstall-Section=universe
Name=OpenJDK Java 8 Runtime
Comment=OpenJDK Java 8 Runtime
Keywords=java;runtime
Exec=cautious-launcher %f /usr/bin/java -jar
Terminal=false
Type=Application
Icon=openjdk-8
MimeType=application/x-java-archive;application/java-archive;application/x-jar;
NoDisplay=true
X-Ubuntu-Gettext-Domain=app-install-data
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