java.lang.NoClassDefFoundError: org/springframework/security/core/userdetails/UserDetailsService

[userxpro]

Does not start, error java.lang.NoClassDefFoundError: org/springframework/security/core/userdetails/UserDetailsService

[ultraq]

I'm going to guess this is a problem on the more recent versions of Java. I've got Java 10 and couldn't pass mvn install, but when I changed it to Java 8 it worked fine.