Fiz o mvn package no eclipse, e apareceram essas cinco mensagens:
WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.thoughtworks.xstream.core.util.Fields (file:/C:/Users/Particular/.m2/repository/com/thoughtworks/xstream/xstream/1.3.1/xstream-1.3.1.jar) to field java.util.Properties.defaults WARNING: Please consider reporting this to the maintainers of com.thoughtworks.xstream.core.util.Fields WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release
O arquivo war foi criado corretamente, deu tudo certo, mas fiquei na dúvida sobre essas mensagens de aviso.