apt - Where does JAVA tar.gz file gets downloaded when it installed by oracle-java9-installer package?

This question is related to already existing question in askubuntu.com.

I installed Sun Java using sudo apt-get install oracle-java9-installer

The procedure downloaded Java tar.gz file like the logs below.

Downloading Oracle Java 9...
--2015-06-11 02:48:37--  http://www.java.net/download/jdk9/archive/b66/binaries/jdk-9-ea-bin-b66-linux-x64-27_may_2015.tar.gz
Resolving www.java.net (www.java.net)... 209.189.227.38
Connecting to www.java.net (www.java.net)|209.189.227.38|:80... connected.
HTTP request sent, awaiting response... 302 Found
Location: https://www.java.net/download/jdk9/archive/b66/binaries/jdk-9-ea-bin-b66-linux-x64-27_may_2015.tar.gz [following]
--2015-06-11 02:48:39--  https://www.java.net/download/jdk9/archive/b66/binaries/jdk-9-ea-bin-b66-linux-x64-27_may_2015.tar.gz

--2015-06-11 02:48:41--  http://download.java.net/jdk9/archive/b66/binaries/jdk-9-ea-bin-b66-linux-x64-27_may_2015.tar.gz?q=download/jdk9/archive/b66/binaries/jdk-9-ea-bin-b66-linux-x64-27_may_2015.tar.gz
Resolving download.java.net (download.java.net)... 137.254.120.26
Connecting to download.java.net (download.java.net)|137.254.120.26|:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: 117953013 (112M) [application/gzip]
Saving to: ‘jdk-9-ea-bin-b66-linux-x64-27_may_2015.tar.gz’

2015-06-11 03:00:39 (161 KB/s) - ‘jdk-9-ea-bin-b66-linux-x64-27_may_2015.tar.gz’ saved [117953013/117953013]
Download done.

Install proceeded as expected in my computer and finished successfully. However I would like to know download location of this xx.tar.gz file in current computer so that I can make a copy of it along with downloaded *deb files in apt-cache. This is for replicating java installation on other similar computers without accessing the download site over internet each time to get 112 M file. I looked at
$HOME/Downloads, /tmp and /var/cache/apt/archives,
but could not locate this file.

Your question is not related to apt-get at all.

Oracle-java9-installer has an installation script that downloads java from Oracle site and installs it. It is very specific to this package.

But your answer is: the tarball is at /var/cache/oracle-jdk9-installer/