As a rule of thumb, you need to have a very powerful hardware to get OracleAS up and running. It needs 4GB ram at least.
We found that the server  faces many unknown errors, if you did not satisfy its hardware requirement. OracleAS usually needs especial servers, with dual CPU and more… Please note that if you want to install OracleAS portal, OracleAS SSO or other components you even need more powerful hardware.

I think that you may face fewer problems with web logic.