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

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Q71. What is ConstraintViolationException in Hibernate ?

Hibernate

Ans. The exception is thrown when a database constraint is violated.

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Q72. What could be the possible cause for following exception ?

org.hibernate.StaleObjectStateException: Row was updated or deleted by another transaction (or unsaved-value mapping was incorrect):

What could be the way to fix it ?

Hibernate

Ans. This looks like the case for optimistic locking wherein hibernate suspects that the information in table was updated by some other transaction after the entity was loaded by current transaction.

One way is to have synchronized entity state and don't detach the entity. Other could be to merge the entity with the table record rather than just directly persisting the entity.

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Q73. What is the difference between JDBC, Hibernate and ODBC ?

Database

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Q74. Explain Hibernate Validation ?

Hibernate

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Q75. What is meant by dirty object checking in hibernate ?

Hibernate

Ans. Dirty Checking is one of the features of hibernate. In dirty checking, hibernate automatically detects whether an object is modified (or) not and need to be updated. As long as the object is in persistent state i.e., bound to a particular Session, Hibernate monitors any changes to the objects and executes sql.

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Q76. Can you write the code for implementing the one to many (student -> courses) relationship in hibernate?

Hibernate

Ans. @OneToMany(cascade = CascadeType.ALL)
@JoinColumn(name = "student_id")
private Set countries;

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Q77. What is difference between Spring jdbc template and Hibernate ?

Hibernate

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Q78. What is the use of second level cache in Hibernate ?

Hibernate

Ans. Second level cache is shared between sessions. Hibernate by default uses first level cache. Second level cache need to be configurd to use.
There are several second level cache e.g eh cache,jboss cache etc.

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Q79. Difference between Eager and Lazy loading in hibernate ?

Hibernate

Ans. Lazy Loading is loading of entities on demand when subclass is called, while Eager loading is loading of all the sub entity at the start only.

Eager loading is fast as all sub entities are already present, but its heavy(takes more memory)

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Q80. What is the difference between save() and persist() in hibernate ?

Hibernate

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Q81. If your application has multiple databases, how many changes you have to made in Hibernate?

Hibernate

Ans. If you have mulitple Databases you just need to add multiple configuration files and create the corresponding SessionFactory object.

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Q82. What is the use of sql dialect ?

Hibernate

Ans. Dialect means "the variant of a language".

Similarly in case of SQL Dialect we specify what dialect of SQL to be generated keeping in mind of underlying database.

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Q83. Which jar files need to be included for using Hibernate ?

Hibernate

Ans. hibernate-orm
hibernate-validator
hibernate-ogm
hibernate-search

or you can download hibernate core with all dependencies.

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Q84. What is Entity in hibernate?

Hibernate

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Q85. Explain hibernate associations.

Hibernate

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Q86. Explain Hibernate caching mechanism

Hibernate

Ans. Every fresh session having its own cache memory, Caching is a mechanism for storing the loaded objects into cache memory. The advantage of cache mechanism is, whenever again we want to load the same object from the database then instead of hitting the database once again, it loads from the local cache memory only, so that the no. of round trips between an application and a database server got decreased. It means caching mechanism increases the performance of the application.

In hibernate we have two levels of caching

First Level Cache [ or ] Session Cache
Second Level Cache [ or ] Session Factory Cache [ or ] JVM Level Cache

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Q87. Explain different inheritance mapping strategies with JPA / Hibernate.

Hibernate

Ans. table per hierarchy
table per concrete class
table per sub class

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Q88. What is the concept of hibernate versioning ?

Hibernate

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Q89. Why do we use Hibernate ?

Hibernate

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Q90. what annotation do in background in hibernate ?

Hibernate

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Q91. Difference between merge and update in hibernate

Hibernate

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Q92. Can you explain integration between Spring and Hibernate ?

Hibernate

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Q93. What is Lazy Initialization in Hibernate ? Reference

Hibernate

a. Feature to load the dependencies from Cache

b. Feature to load all objects and relationships in advance before they can be used

c. Feature to not load dependencies and relationship in advance and load when required

d. Feature to not load the dependencies and relationships at all

Ans.c. Feature to not load dependencies and relationship in advance and load when required

Q94. Which of the following is not the benefit of Lazy Initialization in Hibernate ?

Hibernate

a. Laod When required provides better performance

b. Object stays lighter

c. Less number of Database calls

d. Less load on Database

Ans.c. Less number of Database calls

Q95. Which of the following is not true for Hibernate Cache ?

Hibernate

a. First level cache is enabled by default

b. First level Cache is Session specific

c. First level cache is considered global

d. First level Cache came with Hibernate 1.0

Ans.c. First level cache is considered global

Q96. Which of the following is not an Hibernate Annotation

Hibernate

a. @Id

b. @JoinTable

c. @ManyToMany

d. @Autowired

Ans.d. @Autowired

Q97. Which of the following Design pattern has been used with Hibernate Criteria ?

Hibernate

a. Filter

b. Prototype

c. Builder

d. Observer

Ans.a. Filter

Q98. Which of following is not core interface of Hibernate ?

Hibernate

a. Session

b. Transaction

c. SessionFactory

d. TransactionFactory

Ans.d. TransactionFactory

Q99. Which of the following session method is used to disassociate / disconnect all objects from the session Reference

Hibernate

a. Clear

b. Evict

c. Close

d. Merge

Ans.a. Clear

Q100. Which of the following session method is used to disassociate / disconnect a particular object / entity from the session

Hibernate

a. Clear

b. Evict

c. Close

d. Merge

Ans.b. Evict

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