Starting and Stopping SAP NetWeaver ABAP and Java 
When you start SAP NetWeaver, you start the system database, the application servers, and the respective processes of which the system consists.
Note
In general, the database starts first, and then the SAP instances. When you start the central instance, the database is therefore automatically also started. However, the database is not stopped when you stop the central instance.
The following sections describe how you start and stop SAP NetWeaver ABAP, Java and the add-in installation (ABAP + Java):
Note
In the case of an add-in installation (ABAP + Java), when you start and stop ABAP instances, the corresponding Java instances are automatically also started and stopped, by default. If you want to deactivate the automatic starting of the Java instances, you need to set the instance profile parameter rdisp/j2ee_start to the value 0 in transaction RZ10. You can then restart the Java instance as described in section Restarting the Java Stack of an SAP NetWeaver Dual Stack System. When you stop an ABAP instance, however, the associated Java instance is always also stopped.