https://docs.oracle.com/en/middleware/fusion-middleware/12.2.1.3/opatc/patching-your-environment-using-opatch.html
Patching Your Environment Using OPatch
The OPatch utility provides several commands that you can use to apply and roll back patches to Oracle software in your Oracle Fusion Middleware environment.
your environmentpatchingusingopatch
https://userapps.support.sap.com/sap/support/knowledge/en/2700331
2700331 - Java (1.6) could not be located. OPatch cannot proceed! | SAP Knowledge Base Article
https://www.javamonamour.org/2014/01/opatch-applysession-failed-during.html
Java mon amour: Opatch: ApplySession failed during prerequisite checks: Prerequisite check...
Trying to apply a patch: /opt/oracle/fmw11_1_1_5/oracle_common/OPatch/opatch apply -jdk /opt/oracle/java/ -invPtrLoc /opt/oracle/fm...
mon amourjavaopatchfailedprerequisite