[plantuml,testsequencediagram1.txt.png,png]
....
@startuml

participant ChildA
participant ChildB
participant BaseAbstractClass

activate ChildA
	ChildA -> ChildB : getUtil
	activate ChildB
		ChildB --> ChildA
	deactivate ChildB
	ChildA -> BaseAbstractClass : doSomethingWithReturnValue
	activate BaseAbstractClass
		BaseAbstractClass --> ChildA
	deactivate BaseAbstractClass
	ChildA -> BaseAbstractClass : doSomethingWithParameter
	activate BaseAbstractClass
		BaseAbstractClass --> ChildA
	deactivate BaseAbstractClass
deactivate ChildA

@enduml

....