With NetWeaver 7.1 and JCO 3.0, SAP has completely integrated Java connectivity within the SAP Web Application...
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Server. As such, knowledge of standalone JCO clients has become less valuable. However, there remains a great deal of work within specific SAP technology stacks. If you are more interested in Web applications and user-facing development, check out WebDynpro for Java or simply the NetWeaver Portal development toolkit provided with NetWeaver Developer Studio.
If you are interested in middleware connectivity, connecting SAP to non-SAP systems, or more broadly the enterprise service bus (service-oriented architecture (SOA)), then focus on SAP XI. XI provides XML-based communication between disparate systems, with JCO as the underlying Java communications connector.
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