Important Changes in Autoconfig R12.2

With Oracle E-Business Suite Release 12.2, OC4J has been replaced with Oracle WebLogic Server. This has resulted in a reduced role for AutoConfig in the configuration of the Oracle HTTP Server and the oacore, oafm, forms and forms-c4ws services. This article talks about changes in Autoconfig R12.2
Up to and including Oracle E-Business Suite Release 12.1.3, AutoConfig was used to manage the entire Oracle HTTP Server configuration and OC4J instance configuration.
In Oracle E-Business Suite Release 12.2, it manages only a part of the Oracle HTTP Server configuration. It also only partially manages the configuration of the oacore, oafm, forms and forms-c4ws services. The remaining scope of AutoConfig remains the same as prior to Oracle E-Business Suite Release 12.2.

About Oracle E-Business Suite Release 12.2 Application Technology Stack

Oracle E-Business Suite Release 12.2 introduced Oracle WebLogic Server (WLS) as part of the application tier technology stack, deploying a dedicated WLS domain with associated clusters of managed servers that include:

oacore – provides core functionality in EBS application tier Java code, including OAF based functionality for EBS products
oafm – supports web services, Secure Search and Oracle Transport Agent
forms – provides Oracle forms functionality

Following are the key configuration changes in Autoconfig R12.2

Configuration Activity	Prior to Release 12.2 In	In Release 12.2
Oracle E-Business Suite Database, Concurrent Processing, Oracle Developer10g, profile options, and other Oracle E-Business Suite components.	Oracle Applications Manager	Oracle Applications Manager
Changes to HTTP Configuration	All HTTP configuration was managed via AutoConfig templates. Configuration changes were done by editing the respective context variables and subsequently running AutoConfig.	Most HTTP configuration is managed via native Oracle WebLogic Server tools, Fusion Middleware Control, or manually editing of the configuration files. Only a limited set of HTTP configuration files are maintained via AutoConfig.
Changes to the configuration of oacore, oafm, forms and forms-c4ws services.	All configuration settings for the oacore, oafm, forms, and forms-c4ws services were managed via AutoConfig templates. Configuration changes were accomplished by editing context variables and running AutoConfig	Properties for the oacore, oafm, forms, and forms-c4ws services, including the classpath and JVM arguments, need to be updated through native WebLogic tools such as WebLogic Administration Console. The context variable values are used only to set the initial values during managed server creation.
Managing JVM instances of the oacore, oafm, forms and forms-c4ws services.	The number of instances of service was controlled via Oracle Process Manager (OPMN). This number could be modified by editing the nprocs context variable, running AutoConfig, then stopping and restarting the services.	Each JVM instance of service corresponds to a managed server of that service type. The number of instances needs to be controlled by explicitly creating or deleting managed servers for the service. More details are given later in this chapter.

How the httpd configuration is managed in R12.2

In Oracle E-Business Suite Release 12.2, some Oracle HTTP Server configurations and WebLogic configurations are managed via AutoConfig while some are managed natively via Fusion Middleware Control and WebLogic Server Administration Console. A new mechanism has been introduced to keep the context variables and the OHS configuration parameters (where applicable) in synchronization. This mechanism is called the ‘feedback loop’.

adSyncContext.pl

On Applications Tier:
<AD_TOP>/bin

This script is used to explicitly pull the values of the WebLogic Server and Oracle HTTP Server configuration parameters and synchronize the corresponding context variable values accordingly.

Updating AutoConfig-Managed Oracle HTTP Server Configurations

The table below shows the Oracle HTTP Server configuration templates that are managed by AutoConfig in Oracle E-Business Suite Release 12.2. The configurations defined in these files can be customized by customizing the templates.

Template Name	Configuration File
ssl_terminator_conf_FMW.tmp	ssl_terminator.conf
trusted_conf_FMW.tmp	trusted.conf
oracle_apache_conf_FMW.tmp	oracle_apache.conf
oracle_apache_ssl_conf_FMW.tmp	oracle_apache_ssl.conf
url_fw_conf_FMW.tmp	url_fw.conf
url_fw_ws_conf_FMW.tmp	url_fw_ws.conf
security2_dmz_conf_FMW.tmp	security2_dmz.conf
custom_conf_FMW.tmp	custom.conf
webgate_conf_FMW.tmp	webgate.conf

Updating Seeded Oracle HTTP Server Configurations

During the creation of the Oracle HTTP Server instance, AutoConfig performs the first instantiation of configuration files such as httpd.conf and mod_wl_ohs.conf. After the installation or upgrade to Release 12.2 is complete, seeded Oracle HTTP Server configurations are generally managed via Fusion Middleware Control. In certain specific cases, however, manual editing of the configuration files may be needed: this will be advised separately where required.

When modifying Oracle HTTP Server protocols or port numbers, these values must be updated in both the context file as well as in the configuration files. This is to ensure that the new values are updated in the AutoConfig-managed database profile values as well.

To modify HTTP server protocols or port numbers, perform the following steps on the run file system:

Login to Oracle Fusion Middleware Control Console.
Select Web Tier Target under EBS Domain.
Select Administation > Advanced Configuration.
Edit the relevant file to update the respective HTTP configuration parameter value.
Run the following command on all application tier nodes:

$ perl <AD_TOP>/bin/adSyncContext.pl contextfile=<CONTEXT_FILE>

Run AutoConfig on all application tier nodes.

How the oacore, forms,oafm configuration are done in R12.2

The weblogic managed server are added deleted as per the below-given articles

How to add the manage server in R12.2

How to delete the manage server in R12.2

General Autoconfig information which is the same as pre R12.2

Autoconfig

How to run Autoconfig in parallel

oracle apps autoconfig templates location and How to customize the template for autoconfig files

What is FND_OAM_CONTEXT_FILES used for? All about it

Articles you must read on R12.2