Spring Boot - Async Processing
Why is the question mark (?) required in either the day-of-month or day-of-week field in Spring Boot cron expressions?
Why is the question mark (?) required in either the day-of-month or day-of-week field in Spring Boot cron expressions?
hard📝 Conceptual Q10 of 15
Step-by-Step Solution
Solution:
Step 1: Understand day-of-month and day-of-week fields
In cron, day-of-month and day-of-week fields can both specify when to run, but if both are set, it can cause conflicts or ambiguity.Step 2: Role of question mark
The question mark (?) is used in one of these fields to say 'no specific value' to avoid ambiguity, ensuring the scheduler knows which field to use.Final Answer:
Because specifying both fields causes ambiguity in scheduling -> Option AQuick Check:
Use ? to avoid day-of-month/day-of-week conflict [OK]
Quick Trick: Use ? in one day field to avoid ambiguity [OK]
Common Mistakes:
- Thinking ? means run every day
- Using ? in wrong fields
- Confusing ? with *
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