EXPERT RESPONSE
The best way to run ABAP programs through a Java-based interface is to
RFC-enable them. By creating an RFC wrapper around your ABAP programs, you
allow the R/3 application server to effectively manage any communication
from the outside world. If you have already written the application in
ABAP, then you simply need to go into the Function Builder (SE37), create a
new RFC with the requisite parameters, insert your ABAP program, and check
the 'RFC Enable' box under Administration.
If you are doing simple table lookups, you may want to build your
application logic in Java (e.g. when and what data is retrieved) and use
RFCs such as RFC_READ_TABLE to connect to R/3. This allows you to maintain
your application outside of SAP and means that you can leverage some of the
more advanced features of Enterprise Java (messaging, EJBs, etc.).
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