Javascript with Spin results in ClassNotFoundException org.camunda.spin.Spin.S

Hi Axel,
I recently came across the same ClassNotFoundException on WildFly 14, Camunda 7.10 while executing the following JavaScript snippet in a Script task:

var userName = {“lastname”:“Smith”,“firstname”:“Jack”);
S(JSON.stringify(userName));

Can you share how you fixed the problem? Which library did you declare as global? In which section of the standalone.xml file did you add new lines? How does the standalone.xml look like after your change?
Thanks in advance!
X.