Hello Erman,
 
i am performing an upgrade of 11.0.7 database to 12C. (Doc ID 1524398.1)
 
In section 8, I need to apply 
https://support.oracle.com/rs?type=patch&id= 19382851. In the README, when I do opatch lsinventory it says
 
oraprod#opatch lsinventory
Java could not be located. OPatch cannot proceed!
OPatch returns with error code = 1
 
I have java on my AIX.
 
Thanks,
Roshan