Hi,
I tried to replicate using your steps (but with a "simple" JAR, no parent, no other transitive dependencies etc) and it worked OK.
The Guided Decision Table editor (as do most other editors) tries to load meta-data about the classes, fields etc available for authoring from the model associated with the project (i.e. all JAR dependencies etc).
If this fails it's possible the editor will not open.
Can you please:-
(a) Try with the workaround mentioned in the JIRA (about org.jboss.netty vs io.netty)
(b) Try with no JAR dependencies (i.e. create a data model in the workbench itself).
Thanks,
MikeĀ