Connecting to SAP R/3 system via JCo client and JCo Server

In JCo3.0, Java client JCO.Client is replaced by JCoDestinations. You can connect to SAP system via Inbound RFC Communication (Java calls ABAP) or via Outbound RFC Communication (ABAP calls Java).

JCo Connection Types

For inbound RFC communication, you need to use JCoDestination for executing a remote function module at ABAP side. To use inbound RFCs, you have to use JCoDestination which executes a Function module remotely at ABAP side and while using outbound RFCs, you have to configure a JCoServer at the SAP gateway that is responsible to receive incoming requests from ABAP side and process remote function module at Java side.

Inbound RFC Communication (Java calls ABAP)

In this scenario, Java application acts as a client and calls ABAP function modules in the SAP system using JCoDestination.

Outbound RFC Communication (ABAP calls Java)

Here, the SAP system initiates the call to Java application. The Java application must register a JCoServer to handle incoming requests from SAP.

Connection Architecture

Additional Resources

To know more about configuring JCo connection for inbound and outbound processing, you can refer to the official SAP documentation −

https://help.sap.com/saphelp_nwpi711/helpdata/en/48/70792c872c1b5ae10000000a42189c/frameset.htm

Understanding JCo connection types is essential for building robust SAP integration solutions. Choose the appropriate connection type based on whether your Java application needs to initiate calls to SAP or respond to calls from SAP.