exclusion is not work

[zhangchunyang1024]

my file is :

<artifactSet to="lib">
  <exclusion id="javax.servlet:servlet-api"/>
  <exclusion id="org.eclipse.jetty.aggregate:jetty-all"/>
  <exclusion id="org.slf4j:slf4j-log4j12"/>
  <artifact id="${project.groupId}:dolphinscheduler-server:${project.version}" />
</artifactSet>

i want there is no javax.servlet-spi in libs, but it is still there