|Yes it can but you must either install iPlanet without Server Java Support(Servlets and JSP) or you must disable this feature. You should disable it from the iPlanet Administration User Interface before installing ServletExec.
On Solaris, if you installed iPlanet with a JRE then you must disable it before installing ServletExec. To do this you can use the iPlanet "uninstall" command or you can rename the JRE directory (/bin/https/jre).
Note that ServletExec 2.2 doesn't work with iPlanet Web Server 4.1.