JDK provider and version disparities

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FM 2020-9-25

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/599911-jdk-provider-and-version-disparities

编辑： FM 2021-5-5

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-11.0.8.10-openj9, 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.

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Answer 1

Todd Flanagan 2020-10-29

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编辑：Todd Flanagan 2020-10-29

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.

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Heng gao 2021-5-5

This sounds different to mine.

I jsut installed Matlab2021a.

When i run version-java, it is a oracle java1.8,

but when i run compiler SDK, it is using java11.

This cause the produced by compiler SDK java code is uncompatible to run.

Also, my shell is using java1.8 as well

FM 2021-5-5

编辑：FM 2021-5-5

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.

Thanks.

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