I have class entity: Usage jpametamodel: its correct work with Patient_.MRN. But I have runtime NullPointerException for field Patient_.firstName. jpametamodel generated with hibernate-jpamodelgen version 5.4.30.Final Answer generated class it’s work:
Tag: jpa
JPA : Re-use Id generated from a sequence for a new version of the same object having composite PK (ID + VERSION)
I have entity A with composite PK [ id(generated from sequence) + version ]. For a brand new record I want to pick the id from a sequence defined in the DB side. Lets say its created like below Next time, I want a new version of the same Id to be created like below Note : in the second
Hibernate – Error accessing stax stream – with hibernate.properties
I’m getting this error : INFO: HHH000205: Loaded properties from resource hibernate.properties: {hibernate.connection.driver_class=oracle.jdbc.driver.OracleDriver, hibernate.dialect=org.hibernate.dialect.Oracle8iDialect, hibernate.connection.password=****, hibernate.connection.username=myUserName, hiber…
Saving new entity with JPARepository throws InvalidDataAccessResourceUsageException: could not extract ResultSet
Currently working on a REST API with Springboot + JPA/Hibernate + Oracle. I have an entity called Foo linked to a Bar entity with @ManyToOne (Mulitple Foo can have one Bar). When I send an HTTPS GET to get all Foos, everything works fine. The problem is when I try to send a POST request to create a new Foo.
Mapstruct: Returning null when trying to map a field inside an embedded object
We were given an assignment to recreate a simple version of the Twitter API in Spring using Mapstruct. We are returning a List<UserDto> that should return the field username from the embedded object Credentials. We mapped this as follows: Our UserDto is specified like this: Our User entity has an embedd…
JPA and Hibernate, OneToMany relationship with a composite key using UUID
I’m using SpringBoot with JPA and Hibernate. I have two entities: Book and Author. A Book can have multiple Authors. So I need a OneToMany relationship. Into the Author table, my idea is to use a composite key (the book_id and one internal field for example field_a) I implemented these classes: When I t…
How to use Spring Specification to filter through many to many realtionship?
I decided to create filters in my application with Spring Specification. Everything was going well but I don’t know to do filter User events. Which filter events by user login. My entities look like this: I read many subjects on stack but still don’t know to how to implement my filter logic and fi…
Tables not generated using Derby and OpenJPA
Tables are not generated in database even when i set attribute javax.persistence.schema-generation.database.action to create and connection string javax.persistence.jdbc.url to jdbc:derby:db;create=true persistence.xml: my testing method: As you can see, I also tried to override properties by supplying them t…
java.lang.ClassCastException: [Ljava.lang.Object; cannot be cast or BeanUtils.copyProperties not working
am new to JPA and springboot unable to get the api response when am using @Query param(I try achieve the inner join) Repositoty class: Service class: am getting the ” [Ljava.lang.Object; cannot be cast ” exception after that I have changed to as below: service class foreach added the Object but fo…
Jpa unidirectional relation in the parent entity
I want to make unidirectional relation in the parent entity, Child entities have FK from the parent entity. The Name table has FK from the person table. But I just want to define the relation in person entity only. I used @JoinColumn for mapping and set name as id from the person table In the next example, I …