Oracle Central Inventory (oraInventory) Not Found / Missing oraInst.loc Configuration

This error occurs when Oracle Universal Installer (OUI) or RapidWiz cannot find the Oracle Central Inventory (oraInventory).

Central Inventory does not exist. Skipping central inventory check...
    Trying local inventory in Oracle Home...
    Cannot find oraInventory
    Please create oraInst.loc in the proper directory for your operating system.
    The contents should look like this:
    inventory_loc=/oracle/oraInventory
    where "/oracle/oraInventory" is the direcotry where the central inventory is to be located.

1. Check if oraInst.loc exists

On Linux:

# cat /etc/oraInst.loc

If the file does not exist, create it.

2. Create Oracle Inventory Directory

As root: DB Side

# mkdir -p /oradata/prod/app/oraInventory
# chown -R oracle:dba/oradata/prod/app/oraInventory
# chmod -R 775 /oradata/prod/app/oraInventory

As root: Application Side
# mkdir -p /apps/EBS122/oraInventory
# chown -R applmgr:dba/apps/EBS122/oraInventory
# chmod -R 775 /apps/EBS122/oraInventory
Adjust ownership & directory according to your installation user and group.

3. Create /etc/oraInst.loc
As root:
#vi /etc/oraInst.loc
Contents: DB Side
inventory_loc=/oradata/prod/app/oraInventory
inst_group=dba

Contents: Application Side
inventory_loc=/apps/EBS122/oraInventory
inst_group=dba

Set permissions:
chmod 664 /etc/oraInst.loc

4. Verify
As root:
#cat /etc/oraInst.loc

While launching R12.2.x installer in RHEL/OEL encountered issue

Error

This is a very common issue when running Oracle EBS 12.2.x Rapid Install (RapidWiz) on newer Linux servers.

[applmgr@proderpappl rapidwiz]$ Exception in thread "main" java.lang.UnsatisfiedLinkError: 
/apps/stage122/startCD/Disk1/rapidwiz/jre/Linux_x64/1.6.0/lib/i386/xawt/libmawt.so: libXtst.so.6: cannot open shared object file: No such file or directory
at java.lang.ClassLoader$NativeLibrary.load(Native Method)
at java.lang.ClassLoader.loadLibrary0(Unknown Source)
at java.lang.ClassLoader.loadLibrary(Unknown Source)
at java.lang.Runtime.load0(Unknown Source)
at java.lang.System.load(Unknown Source)
at java.lang.ClassLoader$NativeLibrary.load(Native Method)
at java.lang.ClassLoader.loadLibrary0(Unknown Source)
at java.lang.ClassLoader.loadLibrary(Unknown Source)
at java.lang.Runtime.loadLibrary0(Unknown Source)
at java.lang.System.loadLibrary(Unknown Source)
at sun.security.action.LoadLibraryAction.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at sun.awt.NativeLibLoader.loadLibraries(Unknown Source)
at sun.awt.DebugHelper.<clinit>(Unknown Source)
at java.awt.Component.<clinit>(Unknown Source)
Could not find the main class: oracle.apps.ad.rapidwiz.RIWizard.  Program will exit.

Root Cause

RapidWiz is trying to load the X11 library libXtst.so.6, but the package is not installed on the OS:

libXtst.so.6: cannot open shared object file: No such file or directory

Because the Java GUI libraries cannot load, RapidWiz fails to start:

Could not find the main class: oracle.apps.ad.rapidwiz.RIWizard

Solution
RapidWiz is trying to load a 32-bit library.

If using OL7/OL8 x86_64, install 32-bit compatibility packages:

Step 1: Verify Missing Library
$ locate libXtst.so.6
or
$ find /usr -name "libXtst.so*"
If nothing is returned, install the package.
Step 2: Install Required Package
RHEL/OEL 7
Install below missing two rpms in the same order.

[root@proderpappl ~]# rpm -ivh libXi-1.3-3.el6.i686.rpm
warning: libXi-1.3-3.el6.i686.rpm: Header V3 RSA/SHA256 Signature, key ID fd431d51: NOKEY
Preparing...                ########################################### [100%]
   1:libXi                  ########################################### [100%]

[root@proderpappl ~]# rpm -ivh libXtst-1.0.99.2-3.el6.i686.rpm
warning: libXtst-1.0.99.2-3.el6.i686.rpm: Header V3 RSA/SHA256 Signature, key ID fd431d51: NOKEY
Preparing...                ########################################### [100%]
   1:libXtst                ########################################### [100%]

Verify:
[root@proderpappl ~]# rpm -qa | grep Xtst
[root@proderpappl ~]# ln -s /usr/lib64/libXtst.so.6 /usr/lib/libXtst.so.6