exceptionfactory opened a new pull request, #8248:
URL: https://github.com/apache/nifi/pull/8248
# Summary
[NIFI-9458](https://issues.apache.org/jira/browse/NIFI-9458) Replaces direct
use of
[java.text.SimpleDateFormat](https://docs.oracle.com/javase/8/docs/api/java/text/SimpleDateFormat.html)
with
[java.time.format.DateTimeFormatter](https://docs.oracle.com/javase/8/docs/api/java/time/format/DateTimeFormatter.html)
across component utilities and test classes.
`SimpleDateFormat` handles parsing and formatting instances of
[java.util.Date](https://docs.oracle.com/javase/8/docs/api/java/util/Date.html)
but it lacks features such as nanosecond precision, and can be subject to
subtle conversion issues with time zone offsets.
`DateTimeFormatter` provides parsing and formatting for newer `java.time`
classes, which provide greater precision than other types like `java.sql.Time`
and `java.sql.Timestamp`.
Pattern characters for `DateTimeFormatter` are largely similar to
`SimpleDateFormat`, with several additional characters supporting nanoseconds
and optional boundaries. Some formatting patterns are more strict, which could
lead to parsing failures on some existing custom formats. This is a primary
reason for including these changes as part of the NiFi 2.0 release version.
Functional changes include removing date and time handling methods from the
`DataTypeUtils` class and adding new `FieldConverter` implementations in the
same `nifi-record` module. The new `StandardFieldConverterRegistry` provides an
abstraction for retrieving registered instances of `FieldConverter` based on
the expected output field type. The `FieldConverter` interface approach
provides a more maintainable and focused approach to object conversion while
the `FieldConverterRegistry` provides a similar level of reference convenience.
Instances of `DateTimeFormatter` are thread-safe, unlike `SimpleDateFormat`,
which enables instance caching inside the `StandardFieldConverterRegistry`.
# Tracking
Please complete the following tracking steps prior to pull request creation.
### Issue Tracking
- [X] [Apache NiFi Jira](https://issues.apache.org/jira/browse/NIFI) issue
created
### Pull Request Tracking
- [X] Pull Request title starts with Apache NiFi Jira issue number, such as
`NIFI-0`
- [X] Pull Request commit message starts with Apache NiFi Jira issue number,
as such `NIFI-0`
### Pull Request Formatting
- [X] Pull Request based on current revision of the `main` branch
- [X] Pull Request refers to a feature branch with one commit containing
changes
# Verification
Please indicate the verification steps performed prior to pull request
creation.
### Build
- [X] Build completed using `mvn clean install -P contrib-check`
- [X] JDK 21
### Licensing
- [ ] New dependencies are compatible with the [Apache License
2.0](https://apache.org/licenses/LICENSE-2.0) according to the [License
Policy](https://www.apache.org/legal/resolved.html)
- [ ] New dependencies are documented in applicable `LICENSE` and `NOTICE`
files
### Documentation
- [ ] Documentation formatting appears as expected in rendered files
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