Github user jvz commented on the issue:
https://github.com/apache/logging-log4j2/pull/78
Do you have java 9 installed? Make sure to follow the [setup
instructions](https://github.com/apache/logging-log4j2/blob/master/BUILDING.md).
As for the travis check, the thing below the comments. Don't worry that it
says failed because it doesn't work at the moment anyways.
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