Verifying a cron expression is valid in Java

Question

I\'m writing a scheduling application in Java using Quartz. I\'m using the CronTrigger, but my cron expressions are entered into a database before they are scheduled and are

Answer 1

If you are using org.quartz, you can validate a Cron expression as follows:

try {
    CronExpression cron = new CronExpression(cronExpression);
    ...
} catch (ParseException e) {
    //exception handling
}

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Quoted from official API document Class CronExpression:

public CronExpression(String cronExpression) throws ParseException
Constructs a new CronExpression based on the specified parameter.
Parameters:
cronExpression - String representation of the cron expression the new object should represent
Throws:
ParseException - if the string expression cannot be parsed into a valid CronExpression