[DAFFODIL-2615] group sharing causes obscure unparser runtime error

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.7.0, 3.3.0, 3.2.1
• Fix Version/s: 3.5.0
• Component/s: Back End, Middle "End"
• Assignee: Unassigned
• Reporter: Mike Beckerle
• Created: 31/Dec/21 00:07
• Updated: 28/Feb/23 18:26
• Resolved: 24/Feb/23 15:25

Description

 

While working on a large  DFDL schema, ran into a problem where a group is being shared in 2 places.

I get an obsure message at unparse time like this:

"Unparser needed event for {}nackHeader but got (invalid) {}nackHeader"

This element nackHeader is the element that appears immediately after one of the shared group references. The other one works fine. 

Making a copy of the shared group so that it is no longer shared eliminates the problem and is the workaround. 

I will endeavor to create a simplified scenario to reproduce.