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Over time Java has become more and more integral to the process of implementing SAP. Initially, Java was used as mainly an integration technology, extending EDI, Web and desktop client applications to work with SAP. However, SAP now uses Java in almost every aspect of a rollout. Specifically, you will need some knowledge of Java when dealing with the NetWeaver Portal as well as certain types of WebDynpro applications.
Java projects can either be stored within an external source control system such as the open source CVS or you can use the SAP Design Time Repository (DTR) that comes with the NetWeaver Development Infrastructure (NWDI). The advantage to the DTR is the integration with NetWeaver, but this does require an administrator to install and maintain NWDI. If your company already uses a standard source control system, you will likely be able to find plug-ins to integrate that system with NetWeaver Developer Studio. The key here is the fact that NWDS is actually based on the Eclipse IDE and any plug-ins for Eclipse should work with NWDS.
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