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ClassNotFoundException is logged inещ messages.log file on IDE startup is user has disabled UML module before restart. To reproduce this issue I also have created uml project with dirty sequence diagram before disabling UML module. Not sure what exactly in project causes exception, but without it bug is not reproducible. steps - open IDe - create uml project - create sequence diagram - put lifeline on diagram and DO NOT save it. - disable uml project - close and start IDE attached exception is logged during startup
Created attachment 36144 [details] java.lang.ClassNotFoundException: org.netbeans.modules.uml.project.ui.UMLProjectSettings
The cause was that the project was not closed when uml was uninstalled, so it remains in the open project list, NB tried to load the project upon restart, could not find the required class as the module was uninstalled. It was fixed in last release.
verified in netbeans-hudson-trunk-980-full (Build 070620) other problems related to disabling/uninstalling uml module are filed separately.