SAP R/3 to JAVA Interfacing

Hi Dear all,

My requirement is that to connect SAP R/3 System with JAVA system through RFC. And through that need to pass data from SAP to JAVA AND also JAVA to SAP. Please tell me what is role of ABAPer here. Means what settings I have to do for RFC connection. How to connect both system through RCF. Please give steps to folllow.

Thanks & Regards.

Pradip Pawar.