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Activity Tracing 
You can sequentially record the
activities of individual requests and their
components
for a defined period of time, and then analyze their performance and errors in
the Log
Viewer of the J2EE Engine. Technically, activity tracing is based on
Java Application
Response Time Measurement (JARM).

If you want to record the activities of custom components, you must follow the example of the interfaces provided for this purpose so that the data can be transferred correctly to the Monitoring Service.
You can find further documentation and examples in the SAP Enterprise Portal Development Kit (PDK) section of the Help for the SAP NetWeaver Developer Studio.
Activity tracing is activated and
deactivated in the
Visual
Administrator of the J2EE Engine for a given user or for all users.. In a
cluster environment, activity tracing is activated automatically for all
cluster nodes.
All the trace data is written to file sat.trc.0 in the path ...\usr\sap\<SAP_System ID>\JC<J2EE Engine Instance>\j2ee\cluster\server<n>\log. New trace data is constantly added to this file.
For details about
the configuration see the
Administration Guide
for the J2EE Engine.
For more
information about activating and deactivating single activity tracing, see the
documentation for the Visual Administrator at
Single Activity
Trace.
For more information about the data that is available during activity tracing, see Evaluating Activity Tracing.