Error: java.lang.nullpointerexception

I have got the error "java.lang.nullpointerexception" when I tried to install Oracle 11g client. It was caused due to unavilability of  folder to write install logs in admin mode.

In my case, it was looking for my home directory to write log files.

Solution:

Run cmd prompt in admin mode
map home directory with teh follwoing command
net use x: \\servername\share\home_folder

Then,
Run Oracle client setup in admin mode.

Have a nice day!