Reinaldo, boa tarde!
O jar subiu normalmente? Ou apareceu alguma mensagem de erro? O log esperado era algo assim:
2019-07-22 12:16:57.554 INFO 11025 --- [ main] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat started on port(s): 8080 (http)
2019-07-22 12:16:57.560 INFO 11025 --- [ main] br.com.caelum.cdcreact.Boot : Started Boot in 6.595 seconds (JVM running for 7.343)
2019-07-22 12:17:03.203 INFO 11025 --- [nio-8080-exec-1] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring FrameworkServlet 'dispatcherServlet'
2019-07-22 12:17:03.203 INFO 11025 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet : FrameworkServlet 'dispatcherServlet': initialization started
2019-07-22 12:17:03.225 INFO 11025 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet : FrameworkServlet 'dispatcherServlet': initialization completed in 22 ms
Veja que na primeira linha, lá pro final aparece que subiu na porta 8080, o seu log foi parecido?