Eclipse isn't really equipped to do complex builds. It leaves that job for
Maven and Ant.
Although I'm not really sure that even if it did do what you want that it would give you what you
want. Which is to say that I don't think that the embedded JARs will be accessible from the SAR's classpath. Without special classloaders, jars inside of jars normally aren't.
The secret of how to be miserable is to constantly expect things are going to happen the way that they are "supposed" to happen.
You can have faith, which carries the understanding that you may be disappointed. Then there's being a willfully-blind idiot, which virtually guarantees it.