Can I use the Confluence Data Center auto installer in an air gap environment using RHEL8 OS?

[Carlos E_ Alfaro]

We're clustering the Confluence Data Center and we're using RHEL8 for the host(s).  The systems will not have "internet" access, since we are on a private cloud or air gapped.  From the instructions, the cleanest install method is to use the automatic installer .bin but I'm questioning it since I just completed the first install and received the following error: unable to locate Spring NamespaceHandler for XML shcema namespace (or is that related to db).   

[Jim Knepley - ReleaseTEAM · Accepted solution]

Yes, I've successfully used the installer .bin on a fresh RHEL8-stream install.

Is this the error you're referring to?