When trying to run opatch, the following error occurs:
$ opatch
Error: This Java instance does not support a 64-bit JVM.
Please install the desired version.
OPatch failed with error code 1
SOLUTION
Download the right opatch.
For 19c opatch on Linux x86-64 download “p6880880_190000_Linux-x86-64.zip” instead of “p6880880_190000_Linux.zip”.