OPatch is an Oracle-supplied Java-based utility that supports the following tasks:

• Applying a patch
• Rolling back a patch to a previous version
• Listing the installed patches
• Detecting a conflict when applying a patch after previous patches have been applied. It also suggests the best options to resolve a conflict

OPatch requires installation of the Oracle Universal Installer software. It is platform-independent and runs on all supported operating systems.

For more information, see "About OPatch" in Oracle Fusion Middleware Patching with OPatch.