Spring cron expression for every after 30 minutes

Question

I have following Spring job to run after every 30 minutes. Please check my cron expression, is that correct?

\"0 0 0 * * 30\"

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Answer 1

in web app java spring what worked for me

cron="0 0/30 * * * ?"

This will trigger on for example 10:00AM then 10:30AM etc...

I dont know why but this is working on my local develop and production, but other changes if i made i have to be careful because it may work local and on develop but not on production