Hibernate - Interview Questions and Answers for 'Lazyinitializationexception' | Search Java Interview Question

Hibernate - Interview Questions and Answers for 'Lazyinitializationexception' - 4 question(s) found - Order By Newest

Q1. What are the ways to avoid LazyInitializationException ?

Hibernate

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Ans. 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

5. Using Fetch Join in HQL.

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Q2. What does the following exception means

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

Hibernate

^{2017-02-16 11:28:15}

Ans. The error states that Hibernate is not able to initialize proxy / dependent entity objects as there is no session or transaction present. Very likely we are trying to load the dependent entities lazily but the call to dependent object property is not wrapped within the session or transaction.

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Q3. 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

Hibernate

^{2017-02-16 13:32:41}

Ans. First resolution is a big No as it conveys no lazy loading in complete app. even second is advocating the same but for a particular mapping.

third one is most appropriate if loading and dependent entity property access is closer to each other in code and can be accomplished.

I don't mind using 4th too.

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Q4. Is it advisable to keep session or transaction open for long time just to avoid LazyInitializationException ?

Hibernate

^{2017-02-16 20:33:52}

Ans. No. It's a resource and performance overhead.

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Q5. Which of following is not the resolution for preventing LazyInitializationException?

Hibernate

a. Set fetch=FetchType.EAGER for Dependent entity mapping

b. Make sure that we are accessing the dependent objects before closing the session

c. Make sure that we are accessing the dependent objects after closing the session

d. Wrap the complete access within Transaction

Ans.c. Make sure that we are accessing the dependent objects after closing the session

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