Top 50 Hibernate Interview Questions & Answers [For Beginners & Experienced]
Updated on Nov 24, 2022 | 12 min read | 5.6k views
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Updated on Nov 24, 2022 | 12 min read | 5.6k views
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Hibernate is a lightweight, open-source technique in Java, in this Blog, we will understand the process and mechanism about Hibernate with the top “50 Hibernate interview Questions with the answers.
What is Hibernate?
Hibernate is an open-source object-relational mapping, lightweight tool. It provides a framework to map object-oriented domain models to relational databases for web-based applications.
Here are a few questions we should ask about the application requirements before we adapt the Hibernate:
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ORM Tool
It interprets data creation, data manipulation, and data access. It is a programming approach that maps the object to the data stored in the database.
What is Hibernate Framework?
Hibernate is an object-relational Java-based ORM tool mapping solution. It is an Object-relational mapping that is the programming procedure to map application domain model objects to the relational database tables. It implements a source of implementation of the Java Persistence API that delivers an excellent choice as an ORM tool with the advantages of loose coupling.
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The Hibernate architecture consolidates many objects such as a persistent object, session factory, transaction factory, connection factory, session, transaction.
Hibernate architecture is classified into four layers:
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Why should we choose the Hibernate process?
Here are the below techniques and process which we can use choose when we start the adaptation of process:
It provides a quick solution in an object-oriented programming language with a relational database.
Example: Discrepancies in data types, structural and integrity differences, manipulative and transactional exceptions can all cause object-relational complex mismatches.
2. Automatic Object Mapping:
JDBC and Hibernate lie in the fact that it supports automatic object mapping.” Transparent Persistence “, this method provides Hibernate to draft database tables to the application objects through interaction.
3. Hibernate Query Language (HQL)
Hibernate maintains Structured Query Language (SQL). JDBC only supports SQL, Hibernate Query Language (HQL) is related to SQL in that it is an object-oriented query language. To connect the way, HQL interprets queries toward the SQL queries that can then launch operations in the database.
4. Database Independence
Hibernate provides for mapping connecting data tables and applications through XML files; it provides better ways to transfer the data to a new database if needed. While the manner of accessing databases, information is requisite, if in the case of the reusable of it. Caching is an essential component for database performance, which reduces the time and supports the applications in real-time.
5. Connection pooling in Hibernate:
Hibernate can achieve more reliable performance; it provides “connection pooling”; this is a process to collect the database connections in the cache. These connections can be reusable from the cache itself if the app attempts to connect to the identical database multiple times.
Question:1 How do you configure Hibernate to write the executed SQL statements and use bind parameters to the log file?
Answer: Here are the below steps:
Create two different log sections and log levels to log the executed SQL statements and bind parameters:
Question:2 Describe your favourite features of the Hibernate framework.
Answer: ORM Tool, Hibernate provides a powerful query language (HQL)
Question:3 How can you differentiate Entity Beans and Hibernate.
Answer: Entity beans are containers, classes, descriptors. Hibernate is a tool that instantly persists the object tree to a class.
Question:4 Explain the process of Session object and how we can use it in a first-level cache and a second-level cache?
Answer: First level caching: It starts with each session basis, with a “session” object.
Second level caching: It can be shareable beyond multiple sessions.
Question:5 How does inheritance work in Hibernate? What are the various strategies available to implement it?
Answer: Three types of Inheritance:
Question:6 How does Locking work in Hibernate? What are the various locking mechanisms available?
Answer: Locking mechanisms are optimistic and pessimistic.
Question:7 How does transaction management work in Hibernate?
Answer: It works with the help of (JTA, JDBC).
Question:8 What is lazy loading in Hibernate?
Answer: This mechanism on entities and their associations by implementing a proxy of classes.
Question:9 What are the various fetching strategies available in Hibernate?
Answer: Join fetching and Select fetching
Question:10 What are the various fetching strategies available in Hibernate?
Answer: Join-Fetching and Select Fetchings are the fetchings available in Hibernate.
Question:11 What is the difference between getting () and load() methods in Hibernate?
Answer: getting() and load() which are used for fetching data for the assigned identifier. Get() method return null,load() method throws error of object not found type of exception.
Question:12 Why should you not make the entity class final?
Answer: It is used for entity binding.
Question:13 Explain the advantages and disadvantages of detached objects.
Answer: It connected with the Hibernate session in the past; it has a description in the database
Question:14 What is Hibernate Query Language (HQL)?
Answer: It’s based on OOPS concepts.
Question:15 State the role of SessionFactory interface plays in Hibernate.
Answer: It is a process of a thread-safe object and can be used in the application thread process
Question:16 What is the benefit of Hibernate over JDBC?
Answer: It provides the fastest performance and scalability.
Question:17 Describe some databases maintained by Hibernate.
Answer: Relational database using JDBC.
Question:18 How can you differentiate session.save() and session.persist() method?
Answer: Session.save() it’s used for saving the object in the database and session.persist() for transient, persistent objects.
Question:19 Explain about the update and merge method?
Answer: It can be used to transform the object, which is in a detached state.
Question:20 Is it possible to perform collection mapping with One-to-One and Many-to-One?
Answer: It can be used in a Table which is mapped to many rows in another table.
Question:21 How to perform a transaction in Hibernate?
Answer: With the help of the @transctional class declaration, we can perform a transaction.
Question:22 Where is object/relational mappings represented in Hibernate?
Answer: Hibernate ORM is an object/relational mappings.
Question:23 What is your thought of Light Object?
Answer: Session, Query, Criteria, Transaction are the concept of Light Object.
Question:24 What is @Transient in Hibernate? What is the advantage of this?
Answer: @Transient It applied in javax, its persistence package.
Question:25 How to combine Struts Spring Hibernate?
Answer: With the help of ContextLoaderPlugIn, we can combine.
Question: 26 Explain about the Hibernate Log4j Logging.
Answer: It consists of By log4j.xml file and log4j.properties file.
Question: 27 How can we restrict concurrent updates in Hibernate?
Answer: With the help of the Pessimistic locking Process, we can restrict concurrent updates.
Question: 28 What are the best methods for determining your Hibernate persistent classes?
Answer: There are many best methods and best practices that we can use with Mapping persistent class and its mechanisms.
Question: 29 What is the concept of Modifying persistent objects?
Answer: persistent objects are pursued by hibernating and are stored into the database when a commit request happens.
Question: 30 What is One to Many Bi-directional Relation in Hibernate?
Answer: It is the Reference of the handle of the association attribute of the many views as the benefit of the mappedBy attribute, Hibernate has all the erudition it needs. With these processes, we need to define a bidirectional many-to-one association.
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Question: 31 What is Value replacement in Message Resource Bundle work?
Answer: Hibernate Validator’s ResourceBundleMessageInterpolator generates two instances of ResourceBundleLocator one for UserDefined validation Standard validation messages – defaultResourceBundleLocator.
Question: 32 Explain the process of the SQL statements execution order.
Answer: It s second-level cache in a particular order because of foreign-key constraints cannot be broken: Inserts, Updates, Deletion of array elements, Insertion of array elements, Deletes, in the direction they were presented
Question: 33 How can you set 2nd level cache in Hibernate with EHCache?
Answer: Terracotta Ehcache is a modern cache that worked as a Hibernate second-level cache. It can be practiced as a standalone second-level cache.
Question: 34 What is the main variance between Entity Beans and Hibernate?
Answer: Entity beans continue to be performed by descriptors, containers, classes. Hibernate is just a mechanism that immediately endures the object tree to a class hierarchy in a database.
Question: 35 Explain the steps to join handled using Hibernate?
Answer: With the help of SQL Join, we can handle it.
Question: 36 Explain the process of Hibernate proxy?
Answer: Hibernate proxy is “a functioning mechanism which allows you to serve as the deputy or substitute for another.” This refers to Hibernate when we call Session. load().
Question: 37 What is the main advantage of using the Hibernate than using the SQL?
Answer: With the practice of ORM and with the use of Hibernate, then using the SQL is that Hibernate avoids writing large scale queries.
Question: 38 Explain the design patterns which we can use in Hibernate?
Answer: Proxy pattern, Domain model, and object model are the design patterns.
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Question: 39 Explain Hibernate’s Architecture.
Answer: Hibernate has a layered architecture which accommodates the user to manage without having to understand the underlying APIs
Question: 40 List out the Data types supported in Hibernate?
Answer: IntegerType,FloatType,DoubleType,CharacterType,ShortType.
Question: 41 What is (JDO, CMP)?
Answer: Its Java persistence technologies.
Question: 42 What is the main variance between spring and Hibernate?
Answer: Spring and hibernate are two separate frameworks. Spring contracts with amplifying flow of the application. Hibernate is about the interaction between the application and the database.
Question: 43 When can we find the ORM solutions in Hibernate?
Answer: Hibernate is the concept of Object/Relational Mapping (ORM) solution for Java; the term Object/Relational Mapping regards the procedure of mapping data among an object model description to a relational data model description.
Question:44 Mention the step by step process to complete a transaction in Hibernate.
Answer: with the help of ACID-> properties (Atomicity, Consistency, Isolation, and Durability).
Question:45 Where are the mappings in Hibernate?
Answer: Hibernate mappings are the features of Hibernate; they organize the connection among two database tables while attributes in your model. That lets you quickly drive the associations in your model and Standards queries.
Question:46 Can you touch upon the varying types of relationships possible in Hibernate mapping?
Answer: One-to-one, Many-to-one, One-to-Many, Many-to-Many.
Question:47 Where can we define the object mappings in Hibernate?
Answer: Conversion of Java objects into SQL queries for storing the data.
Question:48 Can you list out the numerous collection types in Hibernate?
Answer: HashMap, HashSet, TreeSet, and Arraylist are the collection types in Hibernate.
Question:49 What’s the process of fetching the data from the database in Hibernate?
Answer: With the help of Hibernate criteria using beginTransaction() API function with the session, we can fetch the data.
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Question:50 Explain about the Hibernate mapping files through the use of JPA annotations @NamedQuery and @NamedNativeQuery.
Answer: @NamedQuery and @NamedNativeQuery are the types of HQL query, which handles the complexities of transforming the HQL into the numerous SQL dialects.
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We hope this article helped you understand the Top 50 Hibernate “Interview” questions for beginners and professionals.
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