All FMW products except the WebLogic server is patched via the opatch tool. From FMW 12.1.2 the WebLogic server is also patched by opatch.
In a FMW installation you can have many Oracle Homes. When you install a patch you need to know which home to apply the patch to.
opatch can help you figure out where to install the patch.
I have a Forms installation that I need to apply a patch to.
I can use find to locate the homes that has an opatch installation.
[oracle@wintermute forms112]$ find . -name OPatch -type d | grep -v Templates ./pfrd_binaries/OPatch ./oracle_common/OPatch
But the domain might not use all the installed products.
Instead I can ask opatch which Oracle Homes is used by a domain.
[oracle@wintermute ~]$ cd /u01/app/oracle/product/forms112/oracle_common [oracle@wintermute oracle_common]$ ./OPatch/opatch lshomes -domain FR112 | grep "Home path" Home path = "/u01/app/oracle/product/forms112/oracle_common" Home path = "/u01/app/oracle/product/forms112/pfrd_binaries"
The FR112 domain uses two Oracle Homes.
I have a patch that need to be applied to one of them. I can ask opatch which home the patch can be installed in.
[oracle@wintermute ~]$ cd /u01/app/oracle/product/forms112/oracle_common [oracle@wintermute oracle_common]$ ./OPatch/opatch checkapplicable -ph /u01/software/forms/p16837591_111210_Generic/16837591 | grep -A 1 "The patch 16837591" The patch 16837591 can be applied to the following homes (1): /u01/app/oracle/product/forms112/pfrd_binaries -- The patch 16837591 cannot be applied to any of following homes. /u01/app/oracle/product/forms112/oracle_common
You can read more about patching FMW with opatch in “Oracle Fusion Middleware Patching Guide 11g Release 1 (184.108.40.206.0)”