RFR: 8240542: Switch FX build to use JDK 14 as boot JDK

[Nir Lisker]

On Fri, 27 Mar 2020 17:10:09 GMT, Johan Vos <jvos at openjdk.org> wrote:

>> Now that we have switched to using gradle 6.3 we can switch to using JDK 14 as the boot JDK for JavaFX 15 builds.
>> 
>> This will not change the minimum JDK version needed to build or run JavaFX, which remains at 11. We will continue to
>> generate class files using `-source 11 -target 11`.
>
> Marked as reviewed by jvos (Reviewer).

> We will continue to generate class files using `-source 11 -target 11`

Isn't `-release 11` the preferred way?

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PR: https://git.openjdk.java.net/jfx/pull/152