Malte created NIFI-14356:
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Summary: Add missing YearMonth and Year queries to
DateTimeFormatter
Key: NIFI-14356
URL: https://issues.apache.org/jira/browse/NIFI-14356
Project: Apache NiFi
Issue Type: Bug
Components: Core Framework
Affects Versions: 2.2.0, 2.1.0, 2.0.0
Environment: OS: Ubuntu 24.04
Reporter: Malte
Apache NiFi 2 has replaced
[SimpleDateFormat|https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/text/SimpleDateFormat.html]
with
[DateTimeFormatter|https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/time/format/DateTimeFormatter.html]
for the [date
functions|https://nifi.apache.org/nifi-docs/expression-language-guide.html#dates]
in the expression language. The
[parseToInstant|https://github.com/apache/nifi/blob/fc04d49057d5208d70342c15ee1e18ea545b14aa/nifi-commons/nifi-utils/src/main/java/org/apache/nifi/util/FormatUtils.java#L240C27-L240C41]
method of the
[FormatUtils|https://github.com/apache/nifi/blob/fc04d49057d5208d70342c15ee1e18ea545b14aa/nifi-commons/nifi-utils/src/main/java/org/apache/nifi/util/FormatUtils.java#L35C14-L35C25]
class which is used by the expression language only includes temporal queries
for the types Instant, LocalDateTime, LocalDate and LocalTime. So that patterns
like 'yyyy' or 'yyyyMM' will throw a DateTimeParseException (regardless of the
date string). Actually the example ({_}${year:toDate('yyyy', 'GMT')}{_}) from
the NiFi 2 [expression language
documentation|https://nifi.apache.org/nifi-docs/expression-language-guide.html#todate]
throws an exception.
I propose to add temporal queries for Year and YearMonth as well.
I will provide a PR for this minor change and link it here.
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