Hi,
A very common question.
Let me make it clear.
Both of them are programming languages.Despite the fact that both are platform independent, ABAP is a query based language and the other is a pure object oriented language.
ABAP is the core for SAP as it's R/3 system are developed using this ABAP language.
SAP decided to move ahead in this world and included ITS into it's product.
Slowly the realised the importance of going web-based, and hence decided to move in the steps of web services so that all the transaction based interactions can move in the form of web services being deployed.
Then they came up with a product called NetWeaver which can have both the JAVA stack and the ABAP stack.
Hope it helps you to know the background and resolves your query.
If you go thru SAP XI architecture diagram , you will get more info on this-
http://help.sap.com/saphelp_nw2004s/helpdata/en/53/fe48b44c5e4bcab5c71fdcf3ee9bc7/content.htm
In general-
Adapter Engine is in J2EE stack
Integration Engine is in ABAP stack.
Some inputs-
Best Regards,
Arman
Bluesky
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