Interview Questions and Answers for 'Nsf international' | Search Interview Question

Interview Questions and Answers for 'Nsf international' - 2 question(s) found - Order By Rating

Frequently asked question in companies using Hibernate.

Q1. What is Lazy Initialization in Hibernate ?

Ans. It's a feature to lazily initialize dependencies , relationship and associations from the Database. Any related references marked as @OneToMany or @ManyToMany are loaded lazily i.e when they are accessed and not when the parent is loaded.

Sample Code for Lazy Initialization

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Related Questions

What are the ways to avoid LazyInitializationException ?

After which Hibernate version , related Entities are initialized lazily ?

What are the points to be considered if we move from Eager initialization to Lazy Initialization in Hibernate ?

How does Lazy Initialization helps improving performance of an application ?

What does the following exception means

org.hibernate.LazyInitializationException: could not initialize proxy - no Session

If you are given choice to avoid LazyInitializationException using any of the following measures, which are the ones you will choose and why ?

1. Set lazy=false in the hibernate config file.
2. Set @Basic(fetch=FetchType.EAGER) at the mapping.
3. Make sure that we are accessing the dependent objects before closing the session.
4. Force initialization using Hibernate.initialize

Very Frequently asked. Have been asked in HCL Technologies very frequently ( based on 3 feedback ). Among first few questions in many interviews.

Q2. Differences between abstract class and interface ?

Core Java

Ans. Abstract classes can have both abstract methods ( method declarations ) as well as concrete methods ( inherited to the derived classes ) whereas Interfaces can only have abstract methods ( method declarations ).

A class can extend single abstract class whereas it can implement multiple interfaces.

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Related Questions

What are the different uses of Interfaces in Java ?

Why can't we have diamond problem with interfaces ?

Why do we need Thread class even in case we execute thread using runnable interface ?

What is the difference between List, Set and Map ?

or

What are the different Java Collections Interfaces ?

What are Marker Interfaces ? Name few Java marker interfaces ?

Can we declare interface methods as private ?

What is comparator interface used for ?

What is the use of runnable interface if we can always create a new thread using Thread class ?

Which of the following doesn't extend Collection interface ?

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