Ingo,
Dependent project support will be in the next minor release of MyEclipse. However, right now you’ll have to create a jar of the classes in your UtilityJar project and place it in the WEB-INF/lib directory of your MyEclipseWeb project. I’d suggest saving the Jar operation as a .jardesc file so that it’s easy to rerun whenever needed.
On the plus side, you’ll still be able to debug the classes in the jar.
–Scott
MyEclipse Support