Consider the following: @Entity @Table(name = “cars”) public class Car { @Id private int id; private String name; @OneToMany(fetch = FetchType.LAZY, cascade = CascadeType….
Tag: spring-data
Spring Data Elasticsearch (4.x) – Using @Id forces id field in _source
Summary Recently we upgraded to Spring Data Elasticsearch 4.x. Part of this major release meant that Jackson is no longer used to convert our domain objects to json (using MappingElasticsearchConverter instead) [1]. This means we are now forced to add a new id field to all our documents. Previously we had dom…
Spring Data @Query use VARCHAR instead of NVARCHAR
The code that I posted is not the code that our companies uses, it is just example code to correctly illustrate the problem. I have the following Spring Data Query: For entity Customer: and Name: This works okay, but Spring data passes these parameters as NVARCHAR instead of VARCHAR. Therefore, the DB has to …
How to use custom data base dialect in spring data?
I need to avoid some bug in db2 dialect in hibernate. I use spring data + gradle (several modules) + kotlin I created my custom dialect And try to add it to application.properties But spring data continuous using DB2Dialect I tried the same code but using java + maven + the same spring data and it’s wor…
How to get the value from system property in spring boot
I am using following command to run my spring boot application Currently, I am able to access it via following command like below However I need to access it via any annotation in Spring something like @value(${library.system.property}) I tried to use But the value of the property is null. Do I need to use co…
Page vs Slice when to use which?
I’ve read in Spring Jpa Data documentation about two different types of objects when you ‘page’ your dynamic queries made out of repositories. Page and Slice So, I’ve tried to find some articles or anything talking about main difference and different usages of both, how performance cha…
Spring boot JPA save manytomany relationship
I am trying to store a manytomany relationship but it not stores the relationship. The following code has generated 3 tables. Soldier, medal and soldier_medals. The service just make a call to a CRUD Interface with save(soldier). It stores correctly the soldier, but it not fill any row at the soldier_medals t…
Use Spring Data JPA without Spring Boot application
I wanted to know if it is possible to use the Spring Data JPA without the rest of the spring framework? I used Spring Data JPA in a Spring Boot web application for another project and really liked how easy it was to use. Now I have a little project with some friends for a Desktop application without a server
Query id return type
I use spring data. I want to get some contracts from DB. So I create two queries. In first I get contracts id that I need, in second I get contract by this id. First query in Repository.class ServiceJPA.class But in last line above I have an error. java.lang.IllegalArgumentException: Parameter value element […
@PreUpdate doesn’t save parent object when it’s updated
I have two entities with relation one to many. Parent can have several Child entity instances. I added a field to the parent that stores the date of children modifications(childrenLastModifiedDate). To maintain that, I added method: Here is the problem. It’s not always invoke when the child is saved. Lo…