Oracle AS mid-tier for J2EE

I have a doubt as to if Oracle AS mid-tier is required for our platform which is basically a Java J2EE application. I guess, the Oracle application server is enough to be installed and the Oracle AS infrastructure is not required to be installed for a Java J2EE application.
I hope, my question is clear.
Please, help in solving the doubt.
regards

Again, if you have a pure J2EE application that does not have any database dependency then all you need is b).
You might want to refer this:
http://download.oracle.com/docs/cd/B14099_19/linux.1012/install.1012/install/basic.htm#sthref324
and
http://download.oracle.com/docs/cd/B14099_19/linux.1012/install.1012/install/mt.htm#sthref524

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