Try this with jdk9/dev:

$ rmid
Activation.main: warning: sun.rmi.activation.execPolicy system
        property unspecified and no ExecPermissions/ExecOptionPermissions
        granted; subsequent activation attempts may fail due to unsuccessful
ExecPermission/ExecOptionPermission permission checks. For
documentation on how to configure rmid security, refer to:

        http://java.sun.com/j2se/1.4/docs/tooldocs/solaris/rmid.html
        http://java.sun.com/j2se/1.4/docs/tooldocs/win32/rmid.html