error while install Oracle Service bus

while install Oracle Service Bus in linux,get following error
You do not have sufficient permissions to access the inventory '/home/tom1/oraInventory'. Installation cannot continue. Make sure that you have read/write permissions to the inventory directory and restart the installer.: Permission denied
the solution is create your own oraInventory in your home
1) create a folder in your home: mkdir oraInventory
2) craete a file in your home: touch oraInst.loc
3) add following content to the file
inventory_loc=/home/dttdev/oraInventory
inst_group=nppdev

then call installer like this

./runInstall -invPtrLoc /home/bpub/oraInst.loc