ObjectBox is not entirely FOSS

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

• https://github.com/LeoColman/Petals/issues/98
• https://github.com/owntracks/android/issues/1298
• https://github.com/Nonononoki/Hendroid/issues/70
• https://github.com/kiwix/kiwix-android/issues/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

README の ObjectBox Gradle plugin の手順から始め、Maven Central にある公開済みの objectbox-gradle-plugin 3.3.1 artifact とその sources JAR を調査します。リリースプロセスによって「Not available yet」とだけ記載された README ではなく、対応するソースコードが提供されていることを確認し、結果として得られる artifact を FLOSS ディストリビューションで使用できることを検証します。