Questions tagged [jpa]
The Jakarta Persistence API (formerly Java Persistence API) (JPA) is a Java specification for accessing, persisting, and managing data between Java objects/classes and a relational database. JPA was defined as part of the EJB 3.0 specification as a replacement for the EJB 2 CMP Entity Beans specification. JPA is now considered the standard industry approach for Object to Relational Mapping (ORM) in the Java Industry.
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JPA EntityManager: Why use persist() over merge()?
EntityManager.merge() can insert new objects and update existing ones.
Why would one want to use persist() (which can only create new objects)?
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How to fix the Hibernate "object references an unsaved transient instance - save the transient instance before flushing" error
I receive following error when I save the object using Hibernate
object references an unsaved transient instance - save the transient instance before flushing
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Difference between FetchType LAZY and EAGER in Java Persistence API?
What is the difference between FetchType.LAZY and FetchType.EAGER in Java Persistence API?
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What's the difference between JPA and Hibernate? [closed]
I understand that JPA 2 is a specification and Hibernate is a tool for ORM. Also, I understand that Hibernate has more features than JPA 2. But from a practical point of view, what really is the ...
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JPA JoinColumn vs mappedBy
What is the difference between:
@Entity
public class Company {
@OneToMany(cascade = CascadeType.ALL , fetch = FetchType.LAZY)
@JoinColumn(name = "companyIdRef", referencedColumnName ...
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Hibernate throws MultipleBagFetchException - cannot simultaneously fetch multiple bags
Hibernate throws this exception during SessionFactory creation:
org.hibernate.loader.MultipleBagFetchException: cannot simultaneously fetch multiple bags
This is my test case:
Parent.java
@...
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Create the perfect JPA entity [closed]
I've been working with JPA (implementation Hibernate) for some time now and each time I need to create entities I find myself struggling with issues as AccessType, immutable properties, equals/...
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The JPA hashCode() / equals() dilemma [closed]
There have been some discussions here about JPA entities and which hashCode()/equals() implementation should be used for JPA entity classes. Most (if not all) of them depend on Hibernate, but I'd ...
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What is the easiest way to ignore a JPA field during persistence?
I'm essentially looking for a "@Ignore" type annotation with which I can stop a particular field from being persisted. How can this be achieved?
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Why does JPA have a @Transient annotation?
Java has the transient keyword. Why does JPA have @Transient instead of simply using the already existing java keyword?
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org.hibernate.HibernateException: Access to DialectResolutionInfo cannot be null when 'hibernate.dialect' not set
I am trying run a spring-boot application which uses hibernate via spring-jpa, but i am getting this error:
Caused by: org.hibernate.HibernateException: Access to DialectResolutionInfo cannot be null ...
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PersistentObjectException: detached entity passed to persist thrown by JPA and Hibernate
I have a JPA-persisted object model that contains a many-to-one relationship: an Account has many Transactions. A Transaction has one Account.
Here's a snippet of the code:
@Entity
public class ...
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What's the difference between Hibernate and Spring Data JPA
What are the main differences between Hibernate and Spring Data JPA?
When should we not use Hibernate or Spring Data JPA?
Also, when may Spring JDBC template perform better than Hibernate and Spring ...
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How do I update an entity using spring-data-jpa?
Well the question pretty much says everything. Using JPARepository how do I update an entity?
JPARepository has only a save method, which does not tell me if it's create or update actually. For ...
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