I use PlantUML with the Eclipse Plugin (version 1.2019.11).
I saw here that "there’s also experimental support for generating a diagram for all the Java classes in a Java project (or within one or more Java packages)".
This is a nice feature, is it operational? If so, how can I use it? I didn't see any way to do it through the plugin nor any documentation. All the classes that I want to generate a class diagram for are in a package named "businessmodel".