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 libraries, most notably Hibernate ORM which provides Object/Relational Mapping for java domain objects.
In addition to its own "native" API, Hibernate ORM is also an implementation of the Java Persistence API (jpa) specification.
I have a Spring Boot application with dependency spring-boot-starter-data-jpa. My entity class has a column annotation with a column name. For example:
@Column(name="TestName")
private String testName;
SQL generated by this created test_name as the…
I am trying to learn spring data JPA by testing some CRUD operation via JpaRepository.
I came across two methods save and saveAndFlush.
I don't get the difference between these two. On calling save also my changes are getting saved into database so…
I'm trying to get a list of all the users from "users" table and I get the following error:
org.hibernate.hql.internal.ast.QuerySyntaxException: users is not mapped [from…
I'm facing what I think is a simple problem with Hibernate, but can't solve it (Hibernate forums being unreachable certainly doesn't help).
I have a simple class I'd like to persist, but keep getting:
SEVERE: Field 'id' doesn't have a default…
I have written a query to delete some objects in my interface extending JPaRepository, but when I execute the query it throws an exception!
Can anyone explain it for me?
Query:
public interface LimitRepository extends JpaRepository…
I have a JPA entity with a property set as
@ManyToOne
@Column(name="LicenseeFK")
private Licensee licensee;
But when I deploy on JBoss 6 the application throws an error saying:
org.hibernate.AnnotationException: @Column(s) not allowed on a…
I'm curious to know, what people here think about using
org.apache.commons.lang.builder EqualsBuilder/HashCodeBuilder
for implementing the equals/hashCode? Would it be a better practice than writing your own? Does it play well with Hibernate?…
Is it possible to use a DB sequence for some column that is not the identifier/is not part of a composite identifier?
I'm using hibernate as jpa provider, and I have a table that has some columns that are generated values (using a sequence),…
This question is somewhat related to Hibernate Annotation Placement Question.
But I want to know which is better? Access via properties or access via fields?
What are the advantages and disadvantages of each?
Despite all of the others post, I can't find a solution for this error with GlassFish, on MacOSX, NetBeans 7.2.
Here the error :
SEVERE: Exception while invoking class org.glassfish.persistence.jpa.JPADeployer
prepare method
SEVERE: Exception while…
I have a problem in my custom deserializer in Jackson. I want to access the default serializer to populate the object I am deserializing into. After the population I will do some custom things but first I want to deserialize the object with the…
What is the default fetch type in hibernate mappings?
What I got to know after exploring is:
for one-to-one it is eager.
for one-to-many it is lazy.
But after testing it in Eclipse, it was eager for all.
Does it depend on whether I am using JPA or…
I have model class like this, for hibernate
@Entity
@Table(name = "user", catalog = "userdb")
@JsonIgnoreProperties(ignoreUnknown = true)
public class User implements java.io.Serializable {
private Integer userId;
private String userName;
…
It seems PostgreSQL does not allow to create a database table named 'user'. But MySQL will allow to create such a table.
Is that because it is a key word? But Hibernate cannot identify any issue (even if we set the PostgreSQLDialect).
We all know the default behaviour of Hibernate when using @SequenceGenerator - it increases real database sequence by one, multiple this value by 50 (default allocationSize value) - and then uses this value as entity ID.
This is incorrect behaviour…
