Troubleshoot SSL configuration Nexus


I want to configure Inbound SSL for Nexus, I followed:

Current version: Nexus Repository Manager OSS 2.12.0-01
Jetty version: 8.1.16.v20140903
For an unknown reason the ssl port is not started.

2023-03-23 09:06:17,463
Error injecting constructor, java.lang.NoClassDefFoundError: Could not initialize class$DefaultSSLContext

Now I want to enable a certain logger in order to see what is the rootcause.
I have already activated following loggers on level: DEBUG
→ org.eclipse.jetty.util.ssl.SslContextFactory

But those loggers doesn’t give me more information to find the rootcause.

Do I have to update Nexus first in order to find the rootcause?
Else? Please mention!
Any help very much appreciated!

Kind regards,
Jacco Raymakers