As long as OpenJDK remains open and maintained for a reasonable length of time, I don't mind. Right now it's looking good, but only thanks to Red Hat (et al.) and not Oracle.
OpenJDK used to have some incompatibilities that tended to blow up in production (rare case "enjoyment") - is it now 100% compatible with original Oracle SDK? Otherwise companies would be forced to use commercial one in order not to disrupt their legacy systems.
Not 100%. There's still some weird edge cases having to do with the swing and crypto libraries. But the big performance regressions that we used to see are gone and with the release of flight recorder in Java 11, the last major commercial feature is now in openJDK.
In addition to compat, is performance on par too? I know the JVM is highly performant and was wondering if there were any patent restrictions that would prevent an open JRE (I assume there is such a thing) from being as performant as the Oracle JRE.
I've found that as of Java 8 the compatibility is pretty good, and I use OpenJDK exclusively now. Prior to that, it definitely had issues and I always used the Sun/Oracle JDK.
Agreed, it's what I've been using in production all along and maybe the rise of docker will mean that fewer people are directly installing the JDK on their production machines. Still, I bet there will still be some unfortunate souls that run the Oracle JDK in production without knowing the rules have changed.
