L1: 1.static binding vs dynamic binding 2.write singleton class 3. If we have list in singleton class how we avoid accessing it outside the class. 4. how to make singleton synchronized 5.java 8 - functional interface and stream API 6. write a program in java 8 max sal of employee 7.@variable & @modifier in JPA 8. why we use marker interface 9. how spring security works, authentication vs authorization 10. what is serialization? why we use is 11. what is transient 12. what is marker interface 13.internal implementation of hashset. L2: 1.aggregation in mongodb 2. mongodb groupby query 3. JPA integration with mongodb 4.microservice architecture 5. kafka producer consumer problem 6. project description. 7. agile methodology 8. Project build related question. 9 . Development process related questions