In Release 12.2.0 and higher, patching is performed by running the new adop (AD Online Patching) utility. You must use adop instead of the adpatch utility that was provided in previous releases. Applications EBS 12.2 introduces online patching using ADOP. Technology patches are applied to the patch file system then ADOP is used to propagate the change into run within the context of a patching cycle.
To start Online Patching, we need to use:
$ adop phase=prepare
To Apply Patches, we need to use:
$ adop phase=apply patches=16205472,16205473
Oracle E-Business Suite R12.2.0 Step by Step Installation follow @ http://www.appsdbatraining.com/2013/09/20/oracle-apps-12-2-2-step-by-step-installation/