[FLINK-2975] Exclude logging dependencies from shaded Hadoop jar.

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Duplicate
• Affects Version/s: 0.9.1
• Component/s: Build System
• Assignee: Unassigned
• Reporter: Jan Thomä
• Created: 05/Nov/15 11:00
• Updated: 05/Nov/15 12:07
• Resolved: 05/Nov/15 12:06

Description

The shaded hadoop jar has Log4j included. Therefore when you try to use flink with logback/slf4j logging you will get warnings like:

```
log4j:WARN No appenders could be found for logger (kafka.consumer.SimpleConsumer).
log4j:WARN Please initialize the log4j system properly.
```
even when you have the appropriate slf4j bridges in the classpath. I'd suggest to exclude the Log4j dependency from the shaded Hadoop jar and then let the end user decide on wether he wants to add log4j or a slf4j bridge to the classpath.

Issue Links

• is duplicated by: FLINK-2703 Remove log4j classes from fat jar / document how to use Flink with logback