Re: [tycho-dev] Prefer currently running Java as ExecutionEnvironment ve

[Christoph Läubrich <laeubi@xxxxxxxxxxxxxx>]

Okay I think I know what might be the source of confusion.

In Eclipse you can configure "Installed JREs" what are concrete 
installations (e.g. Java8u220), where one is the workspace default.

Then there are "Execution Environments" that Map one of those to be 
compatible or (if none is checked) assumes the workspace default.

In different places (for example "JRE System-Library", or target 
platform configuration) you can choose between
1) An "Execution Environment"
2) An "Installed JRE"
3) The Worspace default

But in the end this always maps to a "Installed JRE" installation, the 
EE is just an alias!

I don't know if "Installed JREs" or "Execution Environments" match 
Tychos toolchain (or a mixture ob both), but that doesn't matter much, 
in the end there is only one concrete JRE installation chosen regardless 
of settings of the bundle.

To summarize: If a target specified a JRE (either directly or 
indirectly) and a matching toolchain is available that should be used, 
otherwise the build-jre.

But all this only loosley relates to BundleRequiredExecutionEnvironment.


Am 11.07.20 um 09:43 schrieb Mickael Istria:
> On Sat, Jul 11, 2020 at 7:37 AM Christoph Läubrich 
> <laeubi@xxxxxxxxxxxxxx <mailto:laeubi@xxxxxxxxxxxxxx>> wrote:
>
>     Do you think we should drop support for the BREE-Header and require
>     that
>     the user installs a matching profile-UI with proper dependencies inside
>     their target platform?
>
>
> I think we should drop support for BREE to resolve the execution 
> environment and target-platform.
> So a bundle with BREE JavaSE-1.8 build with Java 11 and no other 
> configuration would then resolve dependencies using Java 11 instead of 
> Java 8 (currently).
>
>     Or do you mean that the BREE-Header should no longer be used to set
>     source/target levels and alike (is what you mean by EE the "JRE System
>     library" to use?)
>
>
> The BREE header should still be used for source/target level.
> If project configures tycho-surefire-plugin useJDK=BREE and has matching 
> toolchains installed; it would use the exact matching toolchain to 
> build, so basically using the correct "JRE System Library" for its BREE; 
> but otherwise (default) it would resolve against the JavaSE-11 System 
> Library, like it's already the case.
>
>     Or do you have the target resolution in mind so we do not resolve the
>     Target (is that what you mean by EE?) for each individual BREE?
>
>
> No, the proposal is that we just ignore the BREE during target platform 
> resolution, and stick to either the explicitly configured EE, or the 
> default one (the running one).
>
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