Useage of sapcontrol on a dual stack

Hi,

I want to use sapcontrol on a dual stack instance to restart only the java stack.;

I can restart both stack with sapcontrol -prot NI_HTTP -nr 00 -function RestartSystem ALL, but if i try sapcontrol -prot NI_HTTP -nr 00 -function RestartSystem J2EE i receive the OK message but JAva is not restartes.

Thanks