Log option for variable calculation

[francis.pang]

I have some performance issue which I am not sure it is lying in the Jaspersoft AJAX or Jaspersoft Server processing. I received an 502 Proxy error.

Proxy Error

The proxy server received an invalid response from an upstream server.
The proxy server could not handle the request GET /jasperserver-pro/rest_v2/reports/organizations/organization_1/Reports/XXX/REPORT_XYZ.pdf.

Reason: Error reading from remote server

<variable name="var_amount_difference" class="java.lang.Double" resetType="Group" resetGroup="Fruit" calculation="Sum">[/code]

I will like to know if it is possible to configure the Log setting in either the log_setting.html or in the Log4j setting files to see the log for calculating the variable?