Recently I attended half day Oracle presentation, one subject standout
JRockit VE on oracle-vm without OS
Afterward I find this link that talk about install oracle-vm over vmware and install WLS.
I decide to try it my own but over vbox.
I use Bridged NIC
about 2GB memory
30GB disk space
During the installation I increase / to about 8GB
Most step is the same as the above blogs and follow this doc