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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Title: Improving Performance for Netting and Settlement Cron Job in Spring JPA
I am working on a netting and settlement process in the banking and finance sector. Specifically, I need to run a cron job every 4 hours and 15 minutes to retrieve data from the transaction table for ...
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Hibernate: Generate non-id value from sequence
I have an entity with 2 fields which both use the same sequence, but when debugging I see that only the id field value is being generated:
@Table(name = "MY_TABLE")
public class MyEntity {
...
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release conenction in JPA multitenancy connection provider
How to handle exception in releaseConenction(String tenantIdentifier, Connection connetcion) method which implements MultiTenantConnectionProvider. How do we ensure the connetcion will be closed if ...
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Can i cascad persist and merge in same time?
I have 2 objects
Network :
@Entity
@Table(name = "network")
@Cache(usage = CacheConcurrencyStrategy.NONSTRICT_READ_WRITE)
public class Network implements Serializable {
private static final long ...
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WrongClassException: Object [id=null] was not of the specified subclass
I have a model like this one below:
@Entity(name = "request")
public class VisitRequest {
@Id
@GeneratedValue
private Long id;
@OneToMany(mappedBy = "visitRequest", cascade = CascadeType.ALL,...
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Hibernate Named Query Using Like and % % operators?
In my Hibernate JPA Sample code..
public List<AttendeesVO> addAttendees(String searchKeyword) {
TypedQuery<AttendeesVO> query = entityManager.createQuery(" select at from AttendeesVO ...
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Nested Interface Projections in Spring Data JPA
I am working on a spring boot based application where I want to utilize interface based projection as I want to select partial column from my mysql database.
I have a CourseEntity.java class with a ...
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javax.persistence.PersistenceException: org.hibernate.exception.GenericJDBCException: could not extract ResultSet
Here the error:
javax.persistence.PersistenceException: org.hibernate.exception.GenericJDBCException: could not extract ResultSet
at org.hibernate.internal.ExceptionConverterImpl.convert(...
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JPA EntityExistsException thown when saving and object
I have the following 2 objects in my project that share the common Composite Primary Key as and ID:
@Entity
@Immutable
@Cacheable(true)
@Cache(usage = CacheConcurrencyStrategy.READ_ONLY)
@Table(name = ...
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QueryDSL join(a, b) vs join(b).on(): Why does @SQLRestriction behave differently?
Intro:
I'm using QueryDSL with Hibernate in a Spring Boot project. I've noticed a difference in the way @SQLRestriction is applied when using join(a, b) versus join(b).on(). Specifically, when using ...
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Issue with Changing @Table Annotation to "users" in JPA Entity Class Using H2 Database
I'm encountering an issue with my Java application where changing the @Table name in my entity class causes the application to fail during tests and runtime. Here are the details:
Originally, my ...
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How to LOCK TABLE ... do stuff ... UNLOCK TABLE with Spring Boot?
The idea is basically to extend some Repositories with custom functionality. So I got this setup, which DOES work!
@MappedSuperclass
abstract class MyBaseEntity {
@Id
@GeneratedValue(strategy ...
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Fix naming convention to remove underscores from Hibernate JPA
Without any changes it was prepending the class UserProfile and BaseModel id (user_profile_id). What I wanted was just ID in the table. When I changed to use
<property name="...
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Retry mechanism for optimistic locking (spring data + JPA)
We decided on using optimistic locking in our web application in order to increase concurrency and without the using of pessimistic locking.
We are now on a lookout for retry solutions.
We would ...
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How to skip some of the entity from ddl update
have several javax.persistence.Entity
most of them are created for the current module, so keeping
spring.jpa.hibernate.ddl-auto = update
Since some of the tables are already there. I was wondering how ...
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