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These are the two types of WARN log messages I get since I upgraded to 8.0.2
2023-01-16 20:46:27,968 WARN [http-nio-8090-exec-9] [struts2.dispatcher.mapper.DefaultActionMapper] cleanupActionName nice page did not match allowed action names [a-zA-Z0-9._!/\-]* - default action index will be used!
2023-01-17 11:21:32,778 WARN [http-nio-8090-exec-4] [struts2.dispatcher.mapper.DefaultActionMapper] cleanupNamespaceName /display/~oliver did not match allowed namespace names [a-zA-Z0-9._/\-]* - default namespace / will be used!