I have 2 entities User and Authority having bidirectional Many-To-One relationship b/w them. But when I send the User object as a response from the RestController, I get nested objects ie. User{Authority{User{Authority{User{Authority{..}}}}}} How can I achieve that the controller must return only? User{Author…
Tag: jpa
PSQLException: ERROR: operator does not exist: bigint = character varying
I am trying to do a LEFT JOIN FETCH to load a lazy loaded some data, but I am getting the following error. I have searched everywhere online to see what I am doing incorrectly, but I don’t see what I am doing differently (other than my id not being a primitive type). Here is what I have Key Repo
Exception with JPA Query Spring
I want to get List of my objects by jpa query I’m using this code: But I get the exception: What is the problem there? Answer There are some missing spaces at the end of string literals. For example after concat the result is like “…from VzClass vzjoin vz.PHClass…”. It should loo…
JPA Entity Class using class object as parameter
I have a class User which has a parameter of another class type ShoppingList. As this… How can i make this ManyToOne relationship while the variable being an array? The idea is to have a User table and another ShoppingList table, so the user can have multiple lists at the same time. Answer This would be…
JPA createQuery where condition does not work
I am trying to use JPA to fetch records from database. However I am able to insert records indatabse and even get all the records using createQuery method of class EntityManager. But in below case I am not getting why the condition in where clause is not working. Please help me figure it out. POJO class : DAO…
GenerationTarget encountered exception accepting Error executing DDL
I am trying to create create a table using jpa entity in SQL Server but when i run the application I am receiving error in creating the table by hibernate. I saw some other solutions as well but they were for mysql as the problem was with the hibernate dialect. I tried different dialect but none of them worke…
Non-Redundant Hibernate List-Mapping (OneToMany)
In a database there are “pastries”. A pastry has zero, one, or many allergens. Hence I’m using a list in Pastry with @OneToMany relation. Now, with this way of managing the relations, we get redundant entries, as for each pastry a new entry with the same allergen is created: Our current solu…
Write JPA entity with foreign key id, read joined entity
I have two entities, A and B that are persisted to a relational database via JPA. Notice how A does not have a B attribute but rather just its id. In my use case at the time of persisting an A entity the B entity does not currently exist and is written later to the db. However, at read time
findAll not fetching OnetoMany fields values in Spring JPA
I am working on a Spring Boot app and I am using a OneToMany annotation to have nested object list inside my another entity object. But while fetching the data that I posted using JPA,while using findAll the OneToMany field is getting returned null. I am able to post the data and its sucessfully creating the …
Using Java records as JPA embeddables
I want to use Java records as embeddable objects with JPA. For example I want to wrap the ID in a record to make it typesafe: But If I try to persist it with Hibernate 5.4.32 I get the following error: So it looks like Hibernate would treat the record Id like an entity, although it is an @Embeddable. The