rzo1 opened a new pull request, #492:
URL: https://github.com/apache/opennlp/pull/492
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### Note:
This PR is the first sub-task of
[OPENNLP-1447](https://issues.apache.org/jira/browse/OPENNLP-1447).
- It introduces `slf4j-api` in OpenNLP and replaces calls to `System.err` or
`System.out` by related logger calls.
- It adds `log4j2` as `runtime` dependency to the OpenNLP distribution +
related configuration and adjusts the scripts accordingly
#### Notes for reviewers:
- Revision of log levels is tracked with
[OPENNLP-1449](https://issues.apache.org/jira/browse/OPENNLP-1449) and is not
scope of the given PR. However, comments on specific log levels are highly
welcome, so they can be tracked and incorporated in OPENNLP-1449.
- Fully use of formatting using the possibilities of SLF4J
eg.`{}`-replacement is tracked with
[OPENNLP-1450](https://issues.apache.org/jira/browse/OPENNLP-1450) and is not
scope of the given PR.
- Log output reduction during the build is currently tracked with
[OPENNLP-1451](https://issues.apache.org/jira/browse/OPENNLP-1451). At the
moment, I introduced `slf4j-simple` as a `test` dependency and disabled log
output. We can discuss how we want to deal with it within OPENNLP-1451.
- If some removed `System.out / System.err` statements (in the tests) are
really needed, please leave a comment. We can easily move them to log statements
#### TODOs for reviewers:
- It would be great, if our heavy CLI users like @atarora can provide
valuable feedback. Due to the absence of a Windows machine, I cannot test the
`.bat` changes - maybe some Windows user can have a look here.
- It would be great, if someone with the `eval` datasets available on
his/her machine can run the `eval` tests and provide feedback, if needed.
- I disabled a few tests, which relied on overriding `System.out` and
gathering the output. Happy to receive ideas on how we can re-write them to
work with `slf4j-simple` in the test context
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