[fedora-java] Clueless Newbie Questions: moving an existing 200K line Java Chatbot from jdk-6u45 to jdk-8u45 WRT java-1.8.0-openjdk-headless

[Philip Rhoades]

People,

My key Java guy can't work on this project any more so I am looking for 
a new developer but while I do that I thought I would try moving from 
the old F17_64 server with jdk-6u45 to my newly installed F22_64 with 
jdk-8u45 - to my surprise the app worked straight away with only 
java-1.8.0-openjdk-headless installed!  Can some kind Java guru point me 
to a link or summarise (in plain English) how this stuff works and the 
relationship between Oracle's JDK and OpenJDK?

Thanks,

Phil.
-- 
Philip Rhoades

PO Box 896
Cowra  NSW  2794
Australia
E-mail:  phil at pricom.com.au