[ https://issues.jboss.org/browse/DROOLS-3431?page=com.atlassian.jira.plugi... ] Michael Anstis commented on DROOLS-3431: ---------------------------------------- Hi [~karreiro], can I have your opinion on this please :-) The issue appears to be that when you first run the workbench and create a file the "Decision Navigator" dock is setup and the (Application Scoped) {{DecisionNavigatorObserver}} instantiated *after* the diagram has been opened and the session created. When you then close the editor and re-open the file, the (Stunner) mechanism that opens the diagram and creates the session fires {{CanvasElementAddedEvent}} events that are received by {{DecisionNavigatorObserver}} before the Dock has its content set to the "open" session. This leads to the NPE in {{DecisionNavigatorBaseItemFactory.diagramUUID()}} reported by [~jomarko]. Now... I [changed|https://github.com/kiegroup/kie-wb-common/commit/89b09561595a063a...] {{DecisionNavigatorBaseItemFactory}} to use the "diagram UUID" as the parent of all base nodes instead of their parent when I added the Decision Service node (as this addition meant a Node's parent was not always the diagram). Do you think it best I find a different approach for getting a "root UUID" for base items in the Decision Navigator. I assume *any* string will do and I don't really need to lookup a UUID for the diagram or any node for that matter. -- This message was sent by Atlassian Jira (v7.12.1#712002)