Oracle EBS 12.2 - ADOP patching on a downtime mode with [ERROR] Patch service is not exist or running

ADOP patching on a downtime mode with [ERROR]     Patch service  is not exist or running

Please note , if you get ADOP issues on PROD please read the logs and understand the problem before executing any commands.

When applying adop patches on a downtime mode you might see an error that the patch service is not existing or running. Please note NOT all patches are meant to be applied to a downtime mode so read the readme of the patch to understand the patching process. Exception cases breaking the rule book patches can be applied to a development environment but you have to know how to deal with post adop failure cases.

In this case it is clear that the patch service is not existing.

adop phase=apply patches=1234567 apply_mode=downtime

Enter the APPS password:
Enter the SYSTEM password:
Enter the WLSADMIN password:

Validating credentials.

Initializing.
   Run Edition context  : /p01/ebs/appl/fs1/inst/apps/ebs_app01/appl/admin/ebs_app01.xml
   Patch edition context: /p01/ebs/appl/fs2/inst/apps/ebs_app01/appl/admin/ebs_app01.xml
   Patch file system free space: 77.95 GB

Validating system setup.
   Node registry is valid.
   [ERROR]     Patch service  is not exist or running
   [WARNING]   ETCC: The following required database fixes have not been applied to node app01:
bla bla bla
Encountered the above errors when performing database validations.
   Resolve the above errors and restart adop.

Fix : connect as APPS user and execute
SQL>  exec ad_zd_prep.create_patch_service;

Run ADOP now and it should proceed further.