Questions on java, hibernate, Spring, database. There major focus on database part. Mostly theoretical questions. Round 2 : Serialization, cloneable, Class loader, Marker Interface, Functional Interface, Hibernate Relationships, DI in spring, questions related to Null in java collections, Collections, thread safety, concurrent hashmap and its internal working, Spring MVC, REST Api Round 3 (Be careful, people are arrogant) : Explain resume (Questions will be on some project), Internal working of singleton in multi-threaded environment (at OS level), Intent of singleton design pattern, Green thread (outdated question which is related to java v 1.0. Hence you need to remember history as well), performance optimization for database query.
