Hibernate - Interview Questions and Answers for 'Atos' | Search Interview Question

Hibernate - Interview Questions and Answers for 'Atos' - 1 question(s) found - Order By Newest

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

Q2. Which of the following is true for == operator ?

Core Java

a. For primitives, == checks if the variables on left and right have same data type

b. For primitives, == checks if the variables on left and right have same value

c. For Objects, == checks if the references on left and right have same data type

d. For Objects, == checks if the references on left and right have same value

Ans.b. For primitives, == checks if the variables on left and right have same value

Q3. Which of the following is equivalent to following logic ?

Not X && Not Y

Core Java

a. x || Y

b. Not(X || Y)

c. Not(X && Y)

d. Not X && Y

Ans.b. Not(X || Y)

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