Hi Jerry,
what is version of software update manager? Please us newest : SUM 1.0 SP11 PL5
What java-related directories do you find under /usr/sap/SM3/SUM/?
Is your SUM-tool under this path located?
In my system I have:
/usr/sap/<SID>/SUM/jvm and
/usr/sap/<SID>/SUM/sdt
Kind regards,
Christoph