mesmo após inserir scan interval o jetty só atualiza após restart.
<plugin>
<groupId>org.eclipse.jetty</groupId>
<artifactId>jetty-maven-plugin</artifactId>
<version>10.0.0.alpha1</version>
<configuration>
<scanIntervalSeconds>10</scanIntervalSeconds>
<webApp>
<contextPath>/loja</contextPath>
</webApp>
</configuration>
</plugin>