I am editing JSP files which are residing directly inside tomcat/webapps/myapp/WEB-INF, but to see the changes, I have to restart the server. As far as I know,
tomcat/webapps/myapp/WEB-INF
An even more late answer ...
Setting "antiResourceLocking" to "true" in the context file may prevent JSP to be reloaded by the Tomcat (Bugzilla 37668).
This is documented on the Tomcat doc, at the "antiResourceLocking" parameter explanation