Why is the IDoc example 3, an IDoc server, complaining about missing: implicit referencing missing type com.sap.jdsr.write.Dsr.IPassport which is included in the com.sap.jco.utils?
Also, in examples 5 and 7 both server type demo applications show the same problem. This effectively means that debugging in the Eclipse environment is very hard if not impossible to do.
You are obviously using Eclipse 2.x. Don't! It contains a bug that leads to the behavior you describe. Upgrade to Eclipse 3.0 Mxx and this bug goes away.