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
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!