[SOLVED] CRON string incompatability Quartz

Issue

I am using Quartz to schedule jobs and display these in an UI. The UI uses an NPM library to calculate the next trigger fire. However, the example string in that library is rejected by Quartz, and a string i have used with success to schedule a result returns invalid fire times from the NPM library.

Quartz Incompatible (works in cron-parser)

*/2 * * * *

CRON-PARSER Incompatible (works in Quartz)

0 0/1 * 1/1 * ? *

Quartz throws Unexpected end of expression exceptions with CRON strings that are valid according to https://crontab.guru/

Can anyone explain why there is an incompatibility here?

Solution

Take a look here, there are different cron-expression implementations with Non-standard characters and different number of supported fields in the expression.

So, according to quartz docs, 6 to 7 fields are supported in Quartz, whereas in https://crontab.guru/ only 5 fields are supported.

And in cron-parser, 5 to 6 fields are supported.

Answered By - yishaiz

Answer Checked By - Cary Denson (WPSolving Admin)