Hope you are doing well.
The jdk has not been downloaded properly in your virtual machine. Please download it from the below updated command.
wget --no-check-certificate --no-cookies --header "Cookie: oraclelicense=accept-securebackup-cookie" http://download.oracle.com/otn-pub/java/jdk/7u79-b15/jdk-7u79-linux-x64.tar.gz
Please let me know if you have any further issue regarding this.