The ClickServlet can be configure to reload the Click application configuration (click.xml) by making a special request:

/click/reload-app.htm
To reload the Click application you need to be authenticate and authorized with the role click-admin.

If you have deployed Click Examples to Tomcat add the following lines to the conf/tomcat-users.xml file and restart Tomcat.

<?xml version='1.0' encoding='utf-8'?>
<tomcat-users>
  <role rolename="click-admin"/>
  <user username="test" password="password" roles="click-admin"/>
</tomcat-users> 
Then try making the /click/reload-app.htm request and login as test/password.

For detailed information on how to configure application reloading see the ClickServlet Javadoc.

To see how this example is configure see the WEB-INF/web.xml file and the Tomcat specific META-INF/context.xml file.