No such property: springSecurityService for class: DUMMY
Usually error messages like
No such property X for class: DUMMY
are caused by having a watch expression in IntelliJ (perhaps other IDEs too) that is evaluated in a context in which X does not exist. So if this exception occurs while you're debugging through your code, check if you're watching some expression that involves springSecurityService. If so, remove this watch and the error should disappear.