fix - Unsupported class file for the build action class

[jdneo]

• Move the GetSourceSetsAction class to the model module, to ensure that the GetSourceSetsAction class is compiled on level 1.8.
• Set the required properties to the BuildActionExecuter.

fix #169

[jdneo]

// cc @Tanish-Ranjan, @Arthurm1

[Arthurm1]

LGTM - makes sense to have the action in the Model project. I'd possibly go further and set the java version for server and plugin to 8 as well since the 17 features are hardly used and then more JDK versions are supported, but it's not for this PR.

[jdneo]

I'd possibly go further and set the java version for server and plugin to 8 as well

the plugin is already 8 now: https://github.com/microsoft/build-server-for-gradle/blob/develop/plugin/build.gradle#L19. Server is now on 17. Yes making it on 8 will expand the usage. But some refactoring needs to be done. I can do that in another PR.

[Tanish-Ranjan]

I have a different thought on this. The Model module only contains model classes which are used by Plugin and Server. It made the most sense for me to have the BuildAction in the Server functionality vise, although as you pointed out, we have a slight catch, that the BuildActions are executed within the Gradle Daemon.

So, I would add this to changes:

• renaming the Model module to Internal (Something being used internally by both Plugin and Server) as it is no longer dedicated for models only.

[jdneo]

@Tanish-Ranjan We can put it a debt. I'll discuss this with Donat to see what's the best answer.

For now, maybe we can merge this change first and release an updat. (I observed this problem because I saw the import success rate drop down from the BI)