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Since Spring 5.3 the CronSequenceGenerator is deprecated, including the static isValidExpression function. The replacement class CronExpression does not contain this helper method, thus throwing us back to a:
try { <create expression object>; return true; } catch (Exception e) { return false; }
I would like to see the static checker method back, either on CronExpression or on another class. Thanks!

This commit introduces CronExpression::isValidExpression, which was also
present on the deprecated CronSequenceGenerator.
Closes: spring-projectsgh-26996

This commit introduces CronExpression::isValidExpression, which was also
present on the deprecated CronSequenceGenerator.
Closes: spring-projectsgh-26996