Problems with starting gui

Hello!

Why do this strange error messages appear?

si4host:si4adm 8> gui

JAVA=/usr/lib/java/bin/java: Command not found.

PH=/opt/SAPGUI/6.30rev4/jar: Command not found.

SOI=/opt/staroffice7/program/classes: Command not found.

JAVA: Undefined variable.

/usr/lib/java/bin/java is an available command!

Need help.

Chantal