Github user alpinegizmo commented on a diff in the pull request:
https://github.com/apache/flink/pull/3858#discussion_r115699196
--- Diff: docs/dev/best_practices.md ---
@@ -284,30 +284,30 @@ Change your projects `pom.xml` file like this:
The following changes were done in the `<dependencies>` section:
- * Exclude all `log4j` dependencies from all Flink dependencies: This
causes Maven to ignore Flink's transitive dependencies to log4j.
- * Exclude the `slf4j-log4j12` artifact from Flink's dependencies: Since
we are going to use the slf4j to logback binding, we have to remove the slf4j
to log4j binding.
+ * Exclude all `log4j` dependencies from all Flink dependencies: this
causes Maven to ignore Flink's transitive dependencies to log4j.
+ * Exclude the `slf4j-log4j12` artifact from Flink's dependencies: since
we are going to use the slf4j to logback binding, we have to remove the slf4j
to log4j binding.
* Add the Logback dependencies: `logback-core` and `logback-classic`
- * Add dependencies for `log4j-over-slf4j`. `log4j-over-slf4j` is a tool
which allows legacy applications which are directly using the Log4j APIs to use
the Slf4j interface. Flink depends on Hadoop which is directly using Log4j for
logging. Therefore, we need to redirect all logger calls from Log4j to Slf4j
which is in turn logging to Logback.
+ * Add dependencies for `log4j-over-slf4j`. `log4j-over-slf4j` is a tool
which allows legacy applications which are directly using the Log4j APIs to use
the Slf4j interface. Flink depends on Hadoop which is directly using Log4j for
logging. Therefore we need to redirect all logger calls from Log4j to Slf4j
which is in turn logging to Logback.
--- End diff --
That was a mistake.
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