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Technical Questions on Java and Oracle. Difference between Materialize and normal views. Externalization vs serialization. Which java classes implements singleton pattern. What is service locator pattern. How would you implement polymorphism in Java. How to redirect user to a different JSP page based on their role. Describe how can you avoid deadlocks. Which data structure is efficient to use in a given scenario (ex: LinkedList, Hashmaps, ArrayList etc.). How can you save objects in HashMaps.