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Questions tagged [hibernate]

Hibernate is an object-relational mapping (ORM) library for the Java language enabling developers to utilize POJO-style domain models in their applications in ways extending well beyond Object/Relational Mapping.

Hibernate is the umbrella for a collection of , most notably Hibernate ORM which provides Object/Relational Mapping for domain objects.
In addition to its own "native" API, Hibernate ORM is also an implementation of the Java Persistence API () specification.

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Beginner's resources

Frequently asked questions

People often ask the following questions:

94278 questions
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What is lazy loading in Hibernate?

What is lazy loading in Java? I don't understand the process. Can anybody help me to understand the process of lazy loading?
rocker
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Difference between @OneToMany and @ElementCollection?

What is the difference between using a @OneToMany and @ElementCollection annotation since both work on the one-to-many relationship?
n_g
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How to fix Hibernate LazyInitializationException: failed to lazily initialize a collection of roles, could not initialize proxy - no Session

In the custom AuthenticationProvider from my spring project, I am trying read the list of authorities of the logged user, but I am facing the following error: org.hibernate.LazyInitializationException: failed to lazily initialize a collection of…
Kleber Mota
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In which case do you use the JPA @JoinTable annotation?

In which case do you use the JPA @JoinTable annotation?
kostas trichas
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Disable all Database related auto configuration in Spring Boot

I am using Spring Boot to develop two applications, one serves as the server and other one is a client app. However, both of them are the same app that function differently based on the active profile. I am using auto configuration feature of Spring…
yuva
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How to convert a Hibernate proxy to a real entity object

During a Hibernate Session, I am loading some objects and some of them are loaded as proxies due to lazy loading. It's all OK and I don't want to turn lazy loading off. But later I need to send some of the objects (actually one object) to the GWT…
Andrey Minogin
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How do synchronized static methods work in Java and can I use it for loading Hibernate entities?

If I have a util class with static methods that will call Hibernate functions to accomplish basic data access. I am wondering if making the method synchronized is the right approach to ensure thread-safety. I want this to prevent access of info to…
tomato
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Kotlin with JPA: default constructor hell

As JPA requires, @Entity classes should have a default (non-arg) constructor to instantiate the objects when retrieving them from the database. In Kotlin, properties are very convenient to declare within the primary constructor, as in the following…
hotkey
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What's the difference between session.persist() and session.save() in Hibernate?

Can anyone tell me what's the advantage of persist() vs save() in Hibernate?
Anthony
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What's the difference between JPA and Spring Data JPA?

I am a bit confused about the difference between Spring Data-JPA and JPA. I know about JPA that it is a specification for persisting the Java Objects to a relational database using popular ORM technology. In other words, JPA provides interfaces and…
Dhruv
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Hibernate vs JPA vs JDO - pros and cons of each?

I'm familiar with ORM as a concept, and I've even used nHibernate several years ago for a .NET project; however, I haven't kept up with the topic of ORM in Java and haven't had a chance to use any of these tools. But, now I may have the chance to…
matt b
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How to fetch FetchType.LAZY associations with JPA and Hibernate in a Spring Controller

I have a Person class: @Entity public class Person { @Id @GeneratedValue private Long id; @ManyToMany(fetch = FetchType.LAZY) private List roles; // etc } With a many-to-many relation that is lazy. In my controller I…
Matsemann
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What is “the inverse side of the association” in a bidirectional JPA OneToMany/ManyToOne association?

In the example section of the @OneToMany JPA annotation reference: Example 1-59 @OneToMany - Customer Class With Generics @Entity public class Customer implements Serializable { ... @OneToMany(cascade=ALL, mappedBy="customer") public…
Behrang
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How to set a default entity property value with Hibernate

How do I set a default value in Hibernate field?
Dejell
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41 answers

Error creating bean with name 'entityManagerFactory' defined in class path resource : Invocation of init method failed

When I compile my spring project, I got the following error. Error creating bean with name 'entityManagerFactory' defined in class path resource [org/springframework/boot/autoconfigure/orm/jpa/HibernateJpaAutoConfiguration.class]: Invocation…
thevikasdube
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