Starting & Stopping the J2EE Engine in SAP NWDS:-
1. Choose Window ® Preferences ® SAP J2EE Engine.
2. Select the option SAP J2EE engine is installed on local host and choose Browse.
3. Select the system and choose OK two times.
4. In the top menu, choose Window ® Show View ® Other ® J2EE ® J2EE Engine.
The J2EE Engine view is opened.
5. In the J2EE Engine view, right-click the Local engine node and choose Start local engine.
The processes are started.
6. Click on the Refresh tree icon.
In the right panel of the J2EE Engine view, the status of the process is displayed.
Handling the Requets :-
 When the user deploys his application in the server
 The server takes the request in the form of objects
 They are maintained in a Queue.
 The Server process the request one by one.
 SDM node in the green color means that the server is up and running
 Several developers can deploy at the same time because deployment usually takes 10-30 seconds.
 If the deployments take place at the same time ,you can get an error message, In this case the other can deploy after 30 sec.
 Configuration of the server must be in such a way that developer can restart the SDM from inside NWDS.
 If the server has number of objects more than the limit then comes the server down problem, this time the SDM node will be in Red color.
 In this case the administrator enters through a login and removes the objects that are locked and releases the objects.
 Then the Server will be running(Up).
Clustering :-
 Definition of cluster?
Cluster is a set of processes that work together to build a scalable and reliable system. It appears to the client as a single unit.
 Why Clustering?
Clustering provides the following advantages.
1.Scalability of the system :- In case of high system load ,you can easily enlarge the current system.
2.High Availability of the system :- The set of mechanisms that the system provides guarantees normal system operation with its ability to transparently recover in case of failures within the cluster
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