central services of the netweaver application server The design of the SAP NetWeaver Application Server is aimed at providing an exceptionally high level of robustness and supportability for the applications running on it. The NetWeaver Application Server consists of the Application Server ABAP (AS ABAP) and the Application Server Java (AS JAVA)
The SAP NetWeaver Application Server is the central foundation for the entire SAP software stack. It also provides a platform for other NetWeaver components (Portal, XI, and so on), as well as for ABAP and Java applications. The full Java EE standard is supported. The SAP NetWeaver Application Server is the further development of the SAP Web Application Server.
Singleton Nodes
It is very important to remember the difference in runtime behaviour between a singleton node and a non-singleton node. When a node is declared to be singleton, there will only ever be only one instance of that node-irrespective of the number of elements found in the parent node's element collection. This is not the case for the non-singleton node. In this case, there will be as many instances of the non-singleton child nodes as there are elements in the parent node's element collection.
The significant point here is that when the lead selection in the parent element collection changes, the contents of the singleton child node become invalid. Consequently, the next time data is required from the singleton child node, the entire element collection must be rebuild in order that it match the data in the newly selected parent element.
The task of rebuilding singleton child node must be performed by a dedicated supply function.
singleton node is related to its parent node collection.
Shortcut Variables u2013 Accessing Generic Controller Interfaces
Accessing or modifying controller metadata:
Accessing or modifying metadata of associated objects:
Accessing generic services: .
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