[FIXED] Invalid @Scheduled method

Issue

It's my first time using the annotation @Scheduled and i need it to repeat the code evry hour from 8to20 from monday to friday, so i used one of the multiple cron generator online and this is what came out :

@Scheduled(cron = "0 0 8-20 ? * MON-FRI *")
public void deleteExpiredSlots() {
    //my code here
}

i get this error Cron expression must consist of 6 fields (found 7 in "0 0 8-20 ? * MON-FRI *")

I removed the ? and the error changed to Encountered invalid @Scheduled method 'deleteExpiredSlots': For input string: "MON" 'MON-FRI' in cron expression "0 0 8-20 * MON-FRI *"

Someone knows what's the problem and possibly how to solve it?

Solution

The seven parameter CRON expression is only supported as of Spring 5.3. Prior to this, you should use this 6 parameter version:

@Scheduled(cron = "0 0 8-20 * * MON-FRI")
public void deleteExpiredSlots() {
    // your code here
}

The above will fire at the top of the hour from 8am to 8pm inclusive, on weekdays.

Answered By - Tim Biegeleisen
Answer Checked By - Terry (JavaFixing Volunteer)