Just addition to above links have some more information about Java Proxy
Java Proxies are Java Class files to access the R/3. If u create an RFC Model for a BAPI/RFC enabled FM the system will automatically create Java Proxy classes for ur R/3 connection.
The Java proxies for the message interfaces are generated using the Integration Builder tool (Design) in the menu Tools --> Java Proxy Generation and subsequently by selecting the message interfaces.
The role of SAP XI’s integration broker is basically to integrate SAP and non-SAP systems, as in the integration of an SAP R/3 system with a database using adapters. SAP XI provides various adapters to integrate different types of systems.
But in some of real-time scenarios, it’s not always a particular type of business system that has to send/receive messages with SAPXI; it can also be an application like ABAP or Java. To cater to these needs, SAP XI provides different ways to generate interfaces in ABAP and JAVA – and these interfaces are known as Proxies.
Java proxies, the Integration Builder tool is used
1) The Java proxies for the message interfaces are generated using the Integration Builder tool (Design) in the menu Tools ---> Java Proxy Generation and subsequently by selecting the message interfaces.
Using the Java Proxy runtime we can Receive messages or Send messages to the Integration Server. The Java proxy runtime supports J2EE applications on the SAP J2EE Engine using Enterprise Java Beans 2.0. Synchronous and Asynchronous Outbound and Inbound communication is possible with Proxy Beans.
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