Segui os passos mas quando rodo a aplicação com todas as dependências ocorre um erro gigante, mas basicamente é isso:
Error creating bean with name 'contaController' defined in file
Error creating bean with name 'contaDAO' defined in file
No qualifying bean of type [org.apache.tomcat.jdbc.pool.DataSource]
found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency