Java port maintainers: What should be installed on the buildbot workers?

[Ryan Schmidt]

On Feb 28, 2018, at 08:08, Aaron Madlon-Kay wrote:

>> Ok. Then my plan is to install the Apple Java 6 JDK and the Oracle Java 7, 8 and maybe 9 JDK, and the Oracle Java 8 JRE. Does that cover all the bases for now?
> 
> The JDKs will install the JRE automatically, and since I don’t think it ever downgrades, you will end up with the Java 9 JRE after installing all the JDKs. If you really want to have the Java 8 JRE, you can install in this order: 6, 7, 9, delete the JRE, then 8. But I don’t think you need to care about the JRE.
> 
> Other than the above I think that sounds good.

You had mentioned Java 9 introducing changes that were not backward compatible. Does that only apply to the JDK, and not the JRE? Should the Java 9 JRE be able to run stuff made with any earlier Java version?