Install old tomcat7 package in newer ubuntu release 16.04

tomcat7installer.sh

#!/bin/sh
# Name: tomcat7installer
# Description: This script will install tomcat7 of ubuntu 14 release in 16.04.
# Tomcat ship with or installed in ubuntu 16.04 is incompatible with Java 7,
# so installing old tomcat version will solve this issue that is achievable through this script.

# remove tomcat if already installed.
echo "Removing existing tomcat7..."
sudo service tomcat7 stop >/dev/null 2>&1

sudo apt-get --purge remove tomcat7 >/dev/null 2>&1

sudo apt-get autoremove >/dev/null 2>&1     # Remove any dependency libraries that produce adverse effect with old tomcat7

sudo add-apt-repository "deb http://in.archive.ubuntu.com/ubuntu/ trusty-updates main restricted"

sudo apt-get update >/dev/null 2>&1

echo "Installing tomcat7..."
sudo apt-get install -y -t trusty-updates tomcat7 >/dev/null 2>&1
echo "tomcat7 installed successfully."