Hi,
This seems to be related to a classpath issue
as the error is related to code from xmlbeans, I wanted to share this information.
The xmlbeans dependency declared in the soapui pom does not follow the usual maven coordinates. This means that if you custom code also depends on xmlbeans and declare this dependency with regular maven coordinates, then, the xmlbeans dependency is added twice to the plugin classpath
Unfortunately, there are also a lot of other dependencies with not regular maven coordinates that could lead to this situation.
Tell me if it helps
