Jra Sap Importante

Accessing BAPIs Using the SAP Java Resource Adapter
Motivation
This tutorial is designed for all Java Developers who want to call function modules and
BAPIs in their J2EE Application and who mayalready have used the SAP Java
Connector (SAP JCo) for this task. However, the SAP JCo – which can be used in any
Java application – is not closely integrated in the J2EE Application Server and doesnot
follow the J2EE standards for integrating enterprise information systems. Therefore, if
you have a J2EE application, we recommend using the SAP Java Resource Adapter 1.0
(SAP JRA) instead.
SAPJRA 1.0 is implemented in compliance with the J2EE standard 1.3 for integrating
enterprise systems: - the Java Connectivity Architecture (JCA) 1.0 – and offers the same
functions as SAP JCo. Youcan call function modules and BAPIs in the ABAP backend.
Since SAP JRA uses SAP JCo for the calls, SAP JRA is basically a thin software layer
between SAP JCo and your J2EE application that maps theSAP JCo API to the standard
interface. But this is not all. Since SAP JRA is closely integrated with the J2EE
Application Server, SAP JRA makes use of J2EE Services, which are not as easilyaccessible through SAP JCo.

In this tutorial, we will demonstrate an example of a Web application that allows you to
book flights in the ABAP backend. This application makes use of the SAP JRA to getinformation from the backend – for example, a list of available flights – and to enter data
in the database of the backend in a transactional context when a flight is booked. As you
may already havenoticed, we only use calls from Java to ABAP in our example. This is
based on the fact that version 1.0 of SAP JRA does not support calls from ABAP to Java.
This function will be available with SAPJRA 1.5 and delivered with J2EE 1.4.

Task
In the first section of this tutorial, you will learn how to deploy the SAP JRA using the
deployment tool of the J2EE Application Server. Then you will...