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https://issues.apache.org/jira/browse/NIFI-12290?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17781089#comment-17781089
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ASF subversion and git services commented on NIFI-12290:
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Commit 786784ef62188b2b018ee262c2e8a750fb507789 in nifi's branch
refs/heads/main from David Handermann
[ https://gitbox.apache.org/repos/asf?p=nifi.git;h=786784ef62 ]
NIFI-12290 Migrated from Quartz to Spring for Cron Expressions
- Removed support for Year field in Cron Expressions
- Changed numeric Day of Week field from starting with 1 to starting with 0
- Removed Quartz and C3P0 from Notice files
This closes #7951
Signed-off-by: Mike Moser <mose...@apache.org>
> Move from Quartz to Spring Cron Expression
> ------------------------------------------
>
> Key: NIFI-12290
> URL: https://issues.apache.org/jira/browse/NIFI-12290
> Project: Apache NiFi
> Issue Type: Improvement
> Components: Core Framework
> Reporter: David Handermann
> Assignee: David Handermann
> Priority: Major
> Fix For: 2.latest
>
> Time Spent: 1h 10m
> Remaining Estimate: 0h
>
> The Quartz library supports [cron|https://en.wikipedia.org/wiki/Cron]
> expression parsing to enable framework component scheduling using the Cron
> strategy.
> The Quartz library includes several legacy dependencies on HikariCP and C3P0
> which are not necessary for framework operations. The Quartz library also
> relies on {{java.util.Date}} for calculation, as opposed to {{java.time}}
> components.
> Spring Framework 5.3 introduced new [Cron Expression
> capabilities|https://spring.io/blog/2020/11/10/new-in-spring-5-3-improved-cron-expressions]
> that provide standard compatibility with [Cron scheduling
> expressions|https://docs.spring.io/spring-framework/docs/current/javadoc-api/org/springframework/scheduling/support/CronExpression.html].
> The Spring CronExpression supports standard {{java.time}} classes.
> The Spring
> [CronExpression|https://docs.spring.io/spring-framework/docs/current/javadoc-api/org/springframework/scheduling/support/CronExpression.html]
> has two differences from the Quartz implementation:
> 1. The Year field is not supported
> 2. The numeric day of the week representation begins with 0 instead of 1
> These differences follow the capabilities of the standard Unix crontab, and
> are not commonly used. However, these differences could invalidate custom
> scheduling configurations that used numeric day of the week or year values.
> Based on existing NiFI framework use of Spring, Quartz should be replaced
> with Spring Cron Expression parsing.
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