Java and ABAP Stack

Hi All,
I am still not clear about role/function of java and abap stack in XI.
Can anybody explain?

Sireesha,
Tha ABAP stack consists of the Integration Server which in turn contains your Integration Engine and Business Process Engine.
The J2EE stack contains the Adapter Engine and your IR and ID run on the J2EE engine.
Most of  XI pipelines happens in the ABAP stack.
All messsages picked by the Adapter Framework running on the J2EE engine are passed to the Integration Engine, which does the routing. The mapping program again gets executed on the Java stack and the rest of the pipeline servies are executed again on the ABAP stack and so on.
please go through links::
ABAP and JAVA in Netweaver stack
https://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/media/uuid/4aa47d27-0a01-0010-5db4-bb62dfc8c069?prtmode=navigate

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