[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

[Andrew Haley]

On 08/07/15 17:06, Philip Rhoades wrote:
> 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?

Oracle's proprietary JDK is based on OpenJDK, plus some extra features
and secret sauce.  Java releases take great care to ensure backawards
compatibility (although it isn't always perfect) so I'm not surprised
that your program worked.

Andrew.