Is "Standard Library Generator" obsolete?



I’m trying to run “standard library generator”, based on following insturctions in github page:

when I’m executing “mvn test-compile exec:java”, a “ClassNotFoundException” is thrown, complaining that “” is not exist?

I coudn’t find above class “ToolsPackage” in the source code either.

I was wondering if the instruction in github page is up-to-date and valid?

Is there any other way to generate "standard libraries?