Create jre from OpenJDK Windows

Question

We are switching from Oracle JDK/JRE to OpenJDK. Now I found only the JDK but I want to have a JRE as well from OpenJDK. This is for installing our application on the client

Answer 1

Since Java 9, you can use jlink to create a custom runtime environment for your application, using only the modules you actually need to run, which is typically even smaller than the traditional JRE was.

Answer 2

So I'm going to post an something a little bit easier than what was posted by SteinarH. I didn't want to have to compile that list myself so.... this does it for you. Also for the sense of being a bit more concise I wouldn't label it java-runtime but instead jre-11 (or whatever version you are using).

jlink --no-header-files --no-man-pages --compress=2 --add-modules $($(java --list-modules) -join "," -replace "@[0-9]*") --output jre-11

Answer 3

For a more straightforward approach i wrote this little tool, which you can use under Windows: https://github.com/g3t00ls/OpenJDKtoOpenJRE

I personally use OpenJDK from: https://jdk.java.net/

It basicly does exactly what SteinarH wrote.

Currently it includes all java modules and exludes all jdk modules! A GUI to select required modules / an auto detect function for required modules for even smaller JRE's will probably be added soon! Currently it still needs jlink, so only >=v9 JDK's will work! This could change in the future!

Answer 4

As far as I know the only place you can download OpenJDK for Windows is Azul website. However, they only seem to provide full JDK, so if you want just the JRE you need to build it yourself as Stephen C suggested.