from Intellij Idea inspection - AbstractClassExtendsConcreteClass

Inheritance issues group 4 errors
Abstract class extends concrete class inspection 3 errors
class AbstractLoader 1 error
ERROR Class 'AbstractLoader' is declared 'abstract', and extends a concrete class
class AbstractViolationReporter 1 error
ERROR Class 'AbstractViolationReporter' is declared 'abstract', and extends a concrete class

We need to review such cases and make a decision how to refactor this bad design.