Starting with Java 9 that changed: above the package now is the module. The module collects related packages together. The Java Platform Module System ... modules, as the JDK and its classes ...

The extension directory is now treated as a separate layer in the module system ... be the platform class loader. Note that in Java 9 and later versions, it is recommended to use modules instead ...

In the case of the Java Platform Module System (JPMS), the past has most certainly ... try JPMS for their projects and fall back to the old non-modular system pretty early because the modules aren't ...