Questions tagged [jpa]
The Java Persistence API (JPA) is a Java specification for accessing, persisting, and managing data between Java objects/classes and a relational database. It is part of the EJB 3.0 specification and is the industry standard approach for Object to Relational Mapping (ORM).
65 questions
0
votes
2
answers
198
views
Keeping the impact of changes low when moving shared domain objects into a library
I’m refactoring a microservice project where multiple services share the same domain objects. Over time, these objects have diverged across services, causing inconsistencies.
To solve this, I plan to ...
- 111
12
votes
4
answers
3k
views
Is the separation of a database process from the main backend process really "good practice"?
In our current architecture, we have a React frontend communicating with a Rust backend via REST calls. We are considering introducing a PostgreSQL database, and my colleague suggests that we should ...
user469823
2
votes
2
answers
745
views
How should I implement data access with jpa to meet Clean Architecture/DDD
For the last few days I'm searching any information about compatibility of JPA and Clean Architecture/DDD. I found next ideas for decoupling application from hibernate.
Do not use @ManyToMany or @...
- 29
0
votes
3
answers
384
views
Java JPA: Transaction logic in DAO vs Service
Being new to JPA and transaction management, I have a Spring Boot REST API application layered like this:
Controller -> Service -> DAO -> DB
I want to be agnostic from any ORM and am using ...
- 9
0
votes
0
answers
155
views
factory methods in JPA entity classes. anti pattern?
I started using factory methods in JPA Entity classes. But I'm not sure if it's an anti-pattern. If it is , then where do I place them instead ?
A similar sample is below
@Builder
@Entity
Class ...
- 157
0
votes
1
answer
229
views
How to persist Objects with the same parent
I am trying to build a "world" consisting of Fields
for simplicity lets say there is a water and town field
i created two classes
@Entity
@Inheritance(strategy = InheritanceType....
- 103
0
votes
0
answers
584
views
How to pass the entity's domain to the repository layer - clean architecture and spring JPA
According to Should I use a layer between service and repository for a clean architecture - Spring the Peristance layer is deprecated because the Repository is already an abstraction.
UML solution of ...
- 111
0
votes
1
answer
2k
views
JPA/Hibernate/Spring - What if M side of @OneToMany is not relevant for business logic?
I am writing a Spring Boot REST API using JPA, so I have my application layers consisting of
controllers
services
repositories
entities
models for request, response, DTOs
This question is mainly ...
- 119
0
votes
1
answer
564
views
How to define API notations for multiple tables data in the response
The question is specific to the API notation shown in the screen under the heading Table Name with the comment Joins Multiple Tables. I am using Spring Boot with JPA (Database: RDBMS)
I have defined ...
- 103
2
votes
1
answer
3k
views
Implementing transactional entity lockouts with Spring and JPA
Spring Boot/Java 8/MySQL here.
I have a widgets table in my MySQL DB that is modeled by a JPA entity like so:
@Entity
@Table(name = "widgets")
@Data
public class Widget {
@Column(name = ...
0
votes
3
answers
333
views
How best to structure my Service/Repository layers when persisting a Many to One object?
I'm working on a project where I need to do CRUD operations on Book and Library objects. Naturally the relationship between Book and Library is Many to One, like so:
@Entity
@Getter
@Setter
@...
4
votes
3
answers
11k
views
Best practices for retrieving data scattered over multiple tables
In the company I work with, we have a 3-layer architecture in our micro-services and the flow is like this:
Repository/DAO (entity) => Service (entity) => Controller (dto)
At the Controller ...
- 57
-2
votes
1
answer
117
views
Entity objects with data external to the database
I'm looking for design patterns to model (java) objects that are partially stored in a database and partially stored some other external source. In my case the external data is a whole lot of files ...
- 318
3
votes
1
answer
6k
views
Best way to handle lazy models with mapstruct and spring transactional scope
In a typical Java Spring Web APP:
we have the following layers:
Model [DB Models]
Repositories [where you have queries to DB]
Services [Business service where you have the @Transactional annotation]
...
- 501
2
votes
3
answers
308
views
Pattern for syncing databases with undo option
I work on a large and old application consisting of a server and a fat client. Part of what the application does is handle a large-ish (a few 100MBs) database of frequently changing data (~a dozen ...
- 318