The inclusion of Java in the title is misleading: "For those coming from the Java world: there's no garbage collector in Ada, so objects allocated by the new op

The inclusion of Java in the title is misleading: "For those coming from the Java world: there's no garbage collector in Ada, so objects allocated by the new operator need to be expressly freed." So really, you first need a prerequisite which explains how to program without a garbage collector, but this will have a much greater scope than a book that just teaches you Ada.