-> How will you respond and convince to people/business if a solution designed by you is failed in performance testing in UAT phase ? -> What are the contract between hashCode and equals method ? -> How does marker interface works internally ? Can you write your own marker interface ? -> What is SOLID design principles ? -> In a chain of REST api calls (eg. A calls B -> B calls C -> C calls D -> D) if C got timeout because of delay in responce from D. How will you handle the request ? -> In above question how will you avoid duplicate calls if second request sent by C is not duplicate at D end ? -> How will you manage the transaction in above case, to maintain single unit of transaction among chain of service call ? -> How will you check for existence of provided integer value out of million records available in DB ? -> What is the difference between truncate and delete ? -> What is the difference between normal view and materialized view ? -> In above example if you use CACHE then how to hanlde the memory outage and what type of CACHE you will implement to less usage of memory ? -> How will you manage a single unit of transaction for multiple DB operations being performed in different methods ? -> Suppose out of 5 methods declared from parent to be in single transaction. But I want 4th method to keep in new transaction but not under the parent one. How will you achieve this ? -> How @Transactional anotation works internally ? What are the different attributes will be there ? -> What is @Primary annotation ? -> When you will go for multithreading implementation ? -> How will you handle if same resources shared by multiple threads ? -> In how many was you can achieve synchronization ? -> What is cloning ? In how many ways you can perform cloning in java ? -> Tell me any 3 exceptions encountered ? -> What is fail-safe and fail-fast ? How Iterator and CopyOnWriteArrayList works internally ? -> What is priority queue ? -> What is blocking queue ?