Development in JAVA within SAP ERP

Hi folks,
i have a general question. My last attempt was testing a Java application which connects via JCo and RFC to an ABAP module and receives some table data or send some integers to that module.
The approach was to write a Java application that handles all the logic and then do some RFC's to get data within a SAP database table and then process this data in the Java application again.
After some beginner problems, everything is working fine now. But now i want to test 2 more approaches.
First, i want to do most of the logic in ABAP and just the most necessary in JAVA, is it possible to do a RFC from ABAP to call a JAVA module? (just the reverse direction as i tried it the last time).
Second, is it possible to deploy a Java application inside a SAP ERP system, that the application can access to all the SAP databases without using an ABAP RFC? I want to write everything in Java that i do not have to write a single line in ABAP but whithout having any limitations.
Thanks in advance!
Kind regards
Felix

To get an idea how to call BAPI's or function modules via RFC from Java you could have a look [here|http://help.sap.com/saphelp_nw04/helpdata/en/35/42e13d82fcfb34e10000000a114084/content.htm]. There are different versions of the JCo library, the latest one is 3. There are a host of other ways to connect to ERP, but this would be one way to do it from Java.
If you cannot work with the standard business objects in SAP, you could of course create Z-tables and custom function modules. BAPI's are the function modules already delivered by SAP, but you can always extend or build your own.

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within a project for my master thesis i have to set up an SAP ERP 2005 System. This system should contain at least three clients. One of them should be the IDES client. Another client should be set up with an existing template. The third client should represent a smal company or at least i should set up some example process from the company (there is no need to map the whole company in the system). These processes should be realized with the SAP standard processes and they should just show how to map easy processes to SAP ERP. Neither the second nor the third client need to run in a productive environment, everything is just for training and testing.
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>
Then why are you posting this on XI forum?
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