Hibernate is one of the most widely used ORM frameworks for Java. If you're preparing for a software engineering interview that requires knowledge in Hibernate for Java, it's a good idea to practice some commonly asked interview questions.
As you may already know, Hibernate is used in Java to access the data layer. However, this framework alone is not enough; it must be supported by two other frameworks — Spring and Struts. So, it is essential to draw references between these frameworks while answering interview questions on Hibernate in Java.
Whether you are a fresher or experienced software developer looking for sample interview questions and answers on Hibernate in Java, we’ve got you covered!
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We will cover the following topics in this article:
Beginners and freshers can go through these commonly asked Hibernate in Java interview questions:
Hibernate is a Java framework that helps a Java application interact with the database. It is an object-relational mapping (ORM) tool, which allows a developer to map POJO.
Its advantages are:
ORM tool is a technique that maps the object stored in the database by using Java API to interact. This process helps simplify data creation, manipulation, and access.
Hibernate is better than other technologies like JDBC:
Hibernate core interfaces are:
A session is an object that helps maintain the connection between Java object application and database.
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Here are a few moderate-level interview questions and answers on Hibernate in Java:
This is an XML file used to define the entity bean fields and corresponding database column mapping. When a project uses third-party classes, where JPA annotations are provided by hibernating cannot be used, Hibernate mapping files comes in handy.
Hibernate supports JPA annotations. Some of which are as follows:
There are five types of collection in Hibernate:
The Hibernate architecture consists of many objects, like session, session factory, query, etc. And the applications developed using Hibernate are mainly categorized into four parts:
Criteria API in Hibernate helps developers build dynamic criteria queries on the persistence database. This is a powerful and more flexible HQL query. It allows to programmatically development criteria objects.
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Experienced Java professionals must prepare for the following types of interview questions and answers on Hibernate in java:
The process of optimizing the performance of Hibernate applications is termed Hibernate tuning. Performance tuning strategies include:
The three states are, Transient, Persistent, and Detached.
Entity class cannot be declared final because Hibernate uses proxy classes and objects for lazy data loading. This is achieved by extending the entity bean. Therefore, if the entity bean is made final, it won't extend.
The hibernate framework provides an optional feature called cache region for queries' resultset. Query cache is useful for frequent queries and within the same parameters.
Beginners can also prepare for these interview questions on Hibernate in Java to make a good impression.
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Q1. Is session thread-safe in Hibernate?
No, the session is not thread-safe, as many threads can access the same simultaneously.
Q2. What is the core interface of Hibernate?
Q3. How many types of cache are there in Hibernate?
There are mainly two levels of cache, first-level and second-level.
Q4. Why is Hibernate used in Java?
Hibernate is an ORM (Object Relational Mapping) tool for Java. It reduces the lines of code by sustaining the object-table mapping.
Q5. What is ORM?
ORM (Object Relational Mapping) is a mapping tool pattern. It primarily converts the data in a relational database into an object for object-oriented programming. It helps simplify data retrieval, creation, and manipulation.
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