Virtual Box: Sharing Folders between Host and Virtual Server:

Install Guest Editions:
Devices-->Install Guest Editions-->Reboot the machine-->right click (Autorun)

If it errors out realted to kernel issue,Please  follow below steps.

yum remove kernel-headers
cd /etc/yum.repos.d/
Please check the linux version and enable yum for that version.
vi public-yum-ol6.repo
enable the latest yum repository [public_ol6_latest] & public_ol6_u7_base]
yum remove kernel-headers
yum -y install kernel-uek-devel-$(uname -r)

Oracle VirtualBox:

Devices-->Shared Folders-->Add New Shared Folder button-->Give  Folder Path & share name(Oracle_Apps_122_Linux64 )-->Click on Make permenent

Linux Guest:
Login as root
mount -t vboxsf  Oracle_Apps_122_Linux64  /shared