Coforge Interview Question

1.What is Functional Interface in Java8 2.What is Marker Interface 3.Internal working of Hashmap and ConcurrentHashmap 4.Exception Hierarchy 5.Difference between ClassnotfoundException and NoClassDefFoundException 6.Questions on Java Serialization 7.Spring Bean Scopes 8.Spring Boot Exception Handling 9.Questions on Hibernate - Many to Many Mapping, Lazy Loading