Below are the steps for applying JVM patch in oracle 12c database.

 

Steps 1 : Download the respective patch from oracle support  and unzip it in the server.

unzip 21555660_hxuz.zip

cd 21555660

Steps 2 : check the conflict against ORACLE_HOME

 

 

Step 3: Shutdown all databases and listeners running from the ORACLE_HOME,where we are applying patch.

 

STEP 4 :  Run optach apply command

 

Step 5 : Now start the database in upgrade mode :

 

step 6 : Run the post patch tool using the new datapatch tool .

 

Step 7 : Start the database in normal mode and check the registry.