OC4J & Oracle Application Server.when which use? relationship between?

In regards to Java EE platforms, I'm used to working with Sun, Glassfish platforms and Servlet as Tomcat containers.

However, I need some straightening with the application servers Oracle... at least the three things that I called an... application server that is:

• Weblogic server
• Oracle Application Server
• OC4J.

I assumed the main specific questions, I have this topic are:

(1) are all Java application servers?

(2) what is the division of labour between all of them? [they all work like servlet containers?]  [or JNDI, etc...?] Or completely overlap their functions... or just partially?

(3) are each one interchangeable [by that I mean: is only used at the time, they work in a hierarchy - for example, if someone wants to use the Oracle application server can use by itself or must they first OC4J?]


I have much more difficulty in finding answers to well known topics, [as I am assuming that the use of application servers is]; at least, a much more difficult that I have do to find how to customize the code that I need and other steps down the line.
I have read a large part of the documentation for these, but many blurs the line between the uses of OC4J and OAS, so what hole in the functionality of the OAS brings WebLogic in the image.


Thus, any help at all that someone can provide would be much appreciated.

Thank you!

1. the EM console is a Web application designed to manage the instance and you are allowed to create many OC4J containers according to the needs, think this OC4J as a case of Tomcat, which will have as much FMV to the need (something that still has no BCI).

2 branch oracle BEA and Weblogic became to be the OAS Java container and they decied to change the name of OAS BCI and they will keep some OAS products and replace other BEA for use in BCI.

Greetings

Tags: Fusion Middleware

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