ObjectBox is not entirely FOSS #1102

Hello ObjectBox team!

In the instructions on the README of the project, we have these instructions:

buildscript {
    ext.objectboxVersion = "3.3.1"
    repositories {        
        mavenCentral()    
    }
    dependencies {
        classpath("io.objectbox:objectbox-gradle-plugin:$objectboxVersion")
    }
}

The plugin added to the classpath is in MavenCentral, this is the latest published version.

As an educated developer, I downloaded the sources jar, so that I could validate the source code that my app is using.

Inside that file, however, there's only a README file:

Not available yet

And naturally, by downloading the Jar file, only .class files are available.

For this reason, the gradle plugin is considered proprietary code. And this has lead F-Droid - the main FLOSS Android distributor - has blocked many apps, such as

• Non-FOSS in F-Droid build - io.objectbox:objectbox-gradle-plugin LeoColman/Petals#98
• Non-FOSS in F-Droid build - io.objectbox:objectbox-gradle-plugin owntracks/android#1298
• Non-FOSS in F-Droid build - io.objectbox:objectbox-gradle-plugin Nonononoki/Hendroid#70
• Non-FOSS in F-Droid build - io.objectbox:objectbox-gradle-plugin kiwix/kiwix-android#3091

And probably more to come.

This is a very serious bug.
I imagine it's somewhere where the code is published to MavenCentral that is not including the source codes.

This issue is a blocker for anyone that wants to integrate ObjectBox to an 100% FLOSS app, such as ones deployed to F-Droid