Error starting fstask

Hello,
after installing the rpm's from sgi and the ibm jre118, i get the following
error starting fstask:
bash:>/usr/bin/fstask : /usr/bin/sysadm/bin/classpath: File or Directory not
found
Illegal option: -p
Java(tm) Runtime Loader Version 1.1.8
Usage: jre [-options] classname [arguments]
Options:
...

bash:>

The file "classpath" of course does not exists. where can i get it ?

btw. the cli interface is doing is job but graphics would be fine... ;-)

thanks in advance
cu
Holger