[MGNLUI-3173] AppInstanceControllerImpl might try to stop an app that's already dereferenced Created: 25/Sep/14  Updated: 09/Mar/21  Resolved: 09/Mar/21

Status: Closed
Project: Magnolia UI
Component/s: app framework
Affects Version/s: 5.3.3
Fix Version/s: None

Type: Bug Priority: Neutral
Reporter: Daniel Lipp Assignee: Unassigned
Resolution: Won't Fix Votes: 0
Labels: None
Remaining Estimate: Not Specified
Time Spent: Not Specified
Original Estimate: Not Specified

Template:
Acceptance criteria:
Empty
Task DoD:
[ ]* Doc/release notes changes? Comment present?
[ ]* Downstream builds green?
[ ]* Solution information and context easily available?
[ ]* Tests
[ ]* FixVersion filled and not yet released
[ ]  Architecture Decision Record (ADR)
Bug DoR:
[ ]* Steps to reproduce, expected, and actual results filled
[ ]* Affected version filled

 Description   

Note: up to know this only happened in load-tests - there's no hint that this is an issue in real life as well. Still it'd be great to understand why we occasionally run into that issue.

When it happens we would get a NPE in AppInstanceControllerImpl#stop where we try to call app.stop(). As a workaround we're now checking for null and log a warning in case it is, so watch out for "App is null - cannot stop. Thread = ..." messages.


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