I ran into the same error with a custom filter.

The problem is easy to reproduce, just create a blank Play2 project, define a custom filter/appender and include it into a conf/logger.xml file.
The only (and VERY bad) workaround is to put the filter in an independant jar file...

It has been discuss in Play ML here https://github.com/playframework/playframework/issues/822, and it seems that the problem is located in logback.

Could you check this bug and say if it's related to logback?
Thanks !

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