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R12 - How to enable logging for Apache,Oc4j and Opmn:

Apache Logging ( Plain Text )
==============================
1) Edit the file $ORA_CONFIG_HOME/10.1.3/Apache/Apache/conf/httpd.conf and set
LogLevel warn (s_apache_loglevel in context file)
2) Bounce the apache
3) Try to access the home URL or reproduce the issue.
4) Collect the following logfiles from $LOG_HOME/ora/10.1.3/Apache
access_log.<unique id>
error_log.<unique id>

Values that can be set to LogLevel variable in httpd.conf file
LogLevel = emerg,alert,crit,error,warn,notice,info,debug.

Apache Logging ( ODL Logging)
=============================
1) Set the following parameters in file $ORA_CONFIG_HOME/10.1.3/Apache/Apache/conf/httpd.conf
OraLogMode [oracle|odl|apache]
OraLogSeverity <message type>:<message level>

Message type: INTERNAL_ERROR, ERROR, WARNING, NOTIFICATION & TRACE
Message level: 1-32 (1 most severe, 32 least)
2) Bounce the apache
3) Try to access the home URL or reproduce the issue.
4) Collect the logfiles from $LOG_HOME/ora/10.1.3/Apache/oracle

OC4J Logging
============
By default Oracle Applications R12 creates 3 OC4J instances:
*  OACore: runs OA Framework-based applications
* Forms: runs Forms-base applications
* OAFM (Oracle Apps Fusion Middleware): runs web services, mapviewer, ascontrol

Loglevel is set in the file
$ORA_CONFIG_HOME/10.1.3/j2ee/<oacore, forms, oafm>/config

Log file path is specified in the file
$ORA_CONFIG_HOME/10.1.3/j2ee/<oacore, forms, oafm>/application-deployments/<oacore, forms, oafm>/orion-application.xml

1) Open the file to set the following log level $ORA_CONFIG_HOME/10.1.3/j2ee/<oacore, forms, oafm>/config/j2ee-logging.xml
2) Come to the location located as
"<logger name='oracle' level='NOTIFICATION:1‘ .....
3) Set the desired logging using following values
<message type>:<message level>
Message type: INTERNAL_ERROR, ERROR, WARNING, NOTIFICATION & TRACE
Message level: 1-32 (1 most severe, 32 least)
4) Locate the log file path from the file
$ORA_CONFIG_HOME/10.1.3/j2ee/<oacore, forms, oafm>/application-deployments/<oacore,forms,oafm>/orion-application.xml
(Will be identified with tag : <log> <file path=...> </log>)
5) Bounce the OC4J instance and reproduce the issue
6) Collect the log files from the following locations .
Plain text -> $LOG_HOME/ora/10.1.3/j2ee/<oacore, forms, oafm>/<oacore,forms,oafm>_<default_group_1>/application.log
ODL Log -> $LOG_HOME/ora/10.1.3/j2ee/<oacore, forms, oafm>/<oacore,forms,oafm>_<default_group_1>/log.xml

OPMN Logging
============
1) Open the file $ORA_CONFIG_HOME/10.1.3/opmn/conf/opmn.xml to set the logging parameter
2) Logging is enabled per component (internal, ons or pm)
3) Levels that can be set are (component codes) as following:
none, fatal, error, warn, notify          (written to .log)
debug1, debug2, debug3, debug4    (written to .dbg)
Ex :
opmnctl set target=log comp=warn
opmnctl set target=debug comp=debug1
4) Bounce opmn services and reproduce the issue
5) Collect the opmn log files generated in $LOG_HOME/ora/10.1.3/opmn
opmn.log , opmn.dbg and opmn.out

NOTE : Logfiles can be enabled for rotation using parameter s_opmn_log_rotation_size, s_opmn_log_rotation_time in opmn.xml

Various Other Logfiles :
========================
$LOG_HOME/appl/admin/log/

Service	Logfile Name
TNS Listener Start/Stop log	adalnctl.txt
Fulfillment Server Start/Stop log	jtffmctl.txt
Oracle HTTP Server start/stop log	adapcctl.txt
Concurrent Managers and ICM start/stop log	adcmctl.txt
Forms OC4J start/stop log	adformsctl.txt
OACore OC4J start/stop log	adoacorectl.txtq
OAFM OC4J start/stop log	adoafmctl.txt
OPMN start/stop log	adopmnctl.txt