This file is indexed.

prerm is in openjdk-8-jre-headless 8u77-b03-3ubuntu3.

This file is a maintainer script. It is executed when installing (*inst) or removing (*rm) the package.

The actual contents of the file can be viewed below.

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#!/bin/sh

set -e

basedir=/usr/lib/jvm/java-8-openjdk-amd64
jre_tools='rmid java keytool jjs pack200 rmiregistry unpack200 orbd servertool tnameserv'

rm -f $basedir/jre/lib/amd64/client/classes.jsa
rm -f $basedir/jre/lib/amd64/server/classes.jsa

if [ "$1" = "remove" ] || [ "$1" = "deconfigure" ]; then
    for i in $jre_tools; do
	update-alternatives --remove $i $basedir/jre/bin/$i
    done

    if which update-binfmts >/dev/null; then
	# try to remove and ignore the error
	if [ -e /var/lib/binfmts/openjdk-8 ]; then
	    update-binfmts --package openjdk-8 \
		--remove jar /usr/bin/jexec || true
	fi
    fi

    update-alternatives --remove jexec $basedir/jre/lib/jexec
fi