ApexAdvancedqueueabletransactionserror-handling
Design Apex transaction finalizers for Queueable failure cleanup
Real World Scenario
Queueable provisioning job fails mid-chain leaving staging records in Processing status blocking retries.
Expected Answer
• Implement System.Finalizer on Queueable class
• Finalizer runs after Queueable completes or fails uncaught exception
• Update staging status to Failed with error message in finalizer
• Release lock flags preventing duplicate job enqueue
• Alert ops via Platform Event or email on finalizer failure path
• Test finalizer with intentional exception in execute method
• Document finalizer vs try-catch in execute overlap
Follow-Up Questions & Answers
Click to expand — each follow-up includes a direct, interview-ready answer
Direct answer: Implement System.Finalizer on Queueable class Also consider: Finalizer runs after Queueable completes or fails uncaught exception In practice: Update staging status to Failed with error message in finalizer Optimize for scale and operational observability.
Architect Perspective
Finalizers are async cleanup hook—use for staging state not business logic continuation.