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APEX - Installing Oracle Application Express Listener

Hi, i'm trying to configuring Oracle REST Data Services(formerly know as Oracle Application Express Listener) on Oracle Database 11g Express Edition to able me use APEX.
I have downloaded and unzipped it but when it came to running "java -jar ords.war" i get the command prompt error;
'java' is not recognized as an internal or external command,
operable program or batch file.'
After researching i was told i need to include my java installation bin directory in the ENVIRONMENT VARIABLE. On checking my server (Windows server 2012 by the way), i discovered java is not installed in the first place. So question is do i need to install java? if so, which? or should i just include in unzipped Oracle REST Data Services folder in the ENVIRONMENT VARIABLES?