For EBS 12.2, the location is $IAS_ORACLE_HOME/instances/EBS_web_<SID>_OHS<INSTANCE_NUMBER> /diagnostics/logs.
Example: /u01/oracle/VIS/fs2/FMW_Home/webtier/instances/EBS_web_VIS_OHS1/diagnostics/logs/OHS/EBS_web_VIS/access_log
Bytheway, if you will start to admisiter EBS 12.2, I sugges you to read my book.
"Practical Oracle E-Business Suite"
Link:
https://www.amazon.com/Practical-Oracle-Business-Suite-Implementation/dp/1484214234