/usr/share/kde4/apps/kjava/pluginsinfo is in kdelibs5-data 4:4.13.0-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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[0]
description=Java Plug-in KJAS for Konqueror
file=kjavaappletviewer.so
mime=application/x-java-applet:class:Java Applet;application/x-java-bean:jar:JavaBeans;
name=Java Plug-in
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