I just ran into this exact same exception in Eclipse 3.7.1 on x64 Windows 7. Both an application class (public static void main) and a JUnit test throw the exception. The unit test also throws when run under Gradle. This is with both jansi 1.8 and 1.9. (Just to be clear, the unit tests don't actually fail since logback absorbs the configuration error.)

BTW, Bob, the link in your comment is broken because it includes the trailing end parenthesis.

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