Installing Oracle JDK 1.7 -- 404 error

I'm trying to install Hadoop 2.7.3. on Elementary OS (which ~ Ubuntu, I believe) following the instructions in the _BUILDING.txt_ that came with the Hadoop files. The file indicates that I need to install Oracle JDK 1.7 by going through the following steps: $ sudo apt-get purge openjdk* $ sudo apt-get install software-properties-common $ sudo add-apt-repository ppa:webupd8team/java $ sudo apt-get update $ sudo apt-get install oracle-java7-installer All works well until the last step, where it exits with an error message which I'm not sure what to make of (sorry if paste is too long; I'd be happy to edit it but Idk what's relevant):

--2017-05-26 10:58:06--  http://download.oracle.com/otn-pub/java/jdk/7u80- 
b15/jdk-7u80-linux-x64.tar.gz Resolving download.oracle.com
(download.oracle.com)... 199.117.103.169, 199.117.103.171

Connecting to download.oracle.com
(download.oracle.com)|199.117.103.169|:80... connected. HTTP request
sent, awaiting response... 302 Moved Temporarily Location:
https://edelivery.oracle.com/otn-pub/java/jdk/7u80-b15/jdk-7u80-linux-x64.tar.gz 

[...]

[following]

--2017-05-26 10:58:06--  http://download.oracle.com/otn-pub/java/jdk/7u80-b15/jdk-7u80-linux-x64.tar.gz?AuthParam=1495814405_54d4699c133b9ceee2666c152616ece6 
Connecting to download.oracle.com
(download.oracle.com)|199.117.103.169|:80... connected.

HTTP request sent, awaiting response... 404 Not Found 2017-05-26
10:58:07 ERROR 404: Not Found.

download failed

Oracle JDK 7 is NOT installed.

dpkg: error processing package oracle-java7-installer (--configure): 
subprocess installed post-installation script returned error exit
status 1 dpkg: dependency problems prevent configuration of
oracle-jdk7-installer:  oracle-jdk7-installer depends on
oracle-java7-installer; however:   Package oracle-java7-installer is
not configured yet.

I figured - the 404 is the main issue - it's looking for files but can't find them So my question is - Is that even true? What is the roadblock here? - How can I fix it, or do I have to take another path? (I am following White's _Hadoop - The Definitive Guide_ for the overall approach. )