Round trip engineering

[doelf]

I have tested round trip engineering with Java. I can create class diagrams from an existing code. But after changing the source followed by synchronization the removed association and the removed class is still on the uml diagram. Therefore I have made some other changes. The result is, that sometimes the synchronization works sometimes not. - I can't believe it!?
Is there any trick to make round trip engineering working?

[Eve]

The only time Enterprise Architect can detect removed classes is when you import a source directory.  This dialog provides an option for what to do when it can't find a class.

Also, if the association was between two classes that still exist, there is an option (Tools | Options | Source Code Engineering | Attribute/Operations) to remove associations.