Infosys Senior System Engineer interview questions

Everything was based on my resume. Round -1: 1. Tell me something about yourself and your work 2. Based on what i answered for question 1, he put up questions on IBM Websphere Application Server 3. Difference between Application Server & web Server, example of each. 4. why would a company use WAS over other App servers? it comes too costly, why not other application servers? 5. Questions on Client - server 6. Default port at which WAS run, is it http or https 7. Whats new in Struts 2.0? 8. how does interceptors provide validation? 9. I'm a lay-man, convince me to use Struts over other frameworks. 10. What is dojo 11. what is static & dynamic polymorphism 11. write a program to count vowels in a string 12. write a program to reverse a string 13. difference b/w final, finally & finalize 14. what is garbage collection, what does it do 15. what is a daemon thread? 16. Garbage collector runs automatically? what will happen if i call system.gc() in my program 17. what is class loader? 18. what are type of collections that you've used? 19. scenario : I want to get the name of the book based on authorName, which collection/most efficient collection shall I use and why 21. who does unit testing? developer or Tester Round -2 : 1. Difference between class and structs 2. how to auto genarate employee id in emp table in oracle? 3. explain agile methodology 4. what is ajax 5. how to make a class non inheritable 6. questions related to package, class/ method access specifiers & modifiers 7. Ever faced any situation, where it is difficult to decide how to proceed further (being a senior member in team)