JDK provider and version disparities

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FM on 25 Sep 2020
Edited: FM on 5 May 2021
I am using Matlab Compiler SDK to make `intlinprog` invokable from Java. I don't program in Java (yet), but have used C++/STL 15 years ago, and used OOP in VBA and Matlab. Java coding logic will probably not be a showstopper for a newbie like me; design patterns, may be more of a challenge, but my stumbling block right now is Java/JDK versions. I've read all I can about them, and now have to discover the reality by doing.
Disparity in JDK provider
I ran into my first version puzzlement in Matlab documentation on configuring the java environment:
[1] https://www.mathworks.com/help/compiler_sdk/ml_code/configure-your-java-environment.html
It says to find Java version in my MATLAB installation using `version -java`. In my MATLAB, the provider is Oracle:
Java 1.8.0_181-b13 with Oracle Corporation Java HotSpot(TM) 64-Bit Server VM mixed mode
However, the documentation [1] says to get the JDK from AdoptOpenJDK. I'm wondering whether this is a mistake? I have in fact installed AdoptOpenJDK's jdk-, but I haven't found an Oracle JDK at their website.
Disparity in Java versions
Since Matlab has its own requirements for JDK version, is there a problem if the system that will invoke the Java-wrapped `intlinprog` uses a different JDK? I've read that Java is largely backward compatible, but I don't know what that means in this context.
Thanks for any clarification on the above disparities, and any reconciliation needed. Meanwhile, I will forge ahead with the documentation without changing my JDK unless I run into problems.

Accepted Answer

Todd Flanagan
Todd Flanagan on 29 Oct 2020
Edited: Todd Flanagan on 29 Oct 2020
You are correct that MATLAB ships with an Oracle version of the JRE. Compiler SDK for Java requires a JDK to compile Java code. MATLAB currently supoprts Java 8, so you are free to use whichever 1.8 compliant JDK you prefer.
The current supported JDK Versiion as well as compilers for other languages are listed here.
FM on 5 May 2021
Edited: FM on 5 May 2021
I revisited my work using Compiler SDK to understand your comment. I was reminded of how confusing I found Java versioning to be, but that's more a consequence of its success and wide-spread usage. This article helped (I found).
I then fired up Compiler SDK to see what JDK it uses, but wasn't able to find my way to that information. Can you please describe what you did to determine that Compiler SDK uses Java 11? I open Compiler SDK from the Matlab GUI using Apps -> Library Compiler. I am using Matlab 2019a.

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