EJB methods with array parameters are causing EJBAccessExceptions when they are annotated with @PermitAll. This bug seemed to be present in 8.0.0.Alpha2 and was fixed (see WFLY-1658). But it seems to be present again in 10.1.0.Final.

For my own use case, this is not a problem since I can simply change the method signatures to use lists instead of arrays. However, I can imagine that this could be a more significant problem for people trying to run existing code that they do not want to (or cannot) touch.