https://forum.plantuml.net/15660/composete-diagram-unsupportedoperationexception-smetana?show=15665
Composete state diagram causes UnsupportedOperationException with smetana - PlantUML Q&A
state diagramcausesunsupportedoperationexceptionsmetanaplantuml
https://javaspecialists.teachable.com/courses/709194/lectures/14506294
2.3.9. UnsupportedOperationException | JavaSpecialists
Don't repeat yourself. The mantra of the effective Java programmer. Dynamic proxies get us there quicker.
unsupportedoperationexceptionjavaspecialists