OneToMany « JPA « Spring Q&A

1. JPA @OneToMany and @ManyToOne: back reference is null

I have the following data structure.

public class Device extends AbstractEntity implements Serializable{
    private int id;
    private List<Item> items;


2. do i need extra coding in java side for hibernate one-to-many annotations

Here are my hibernate classes

package com.vaannila.domain;

import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Set;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.Table;

import org.springframework.web.bind.annotation.ModelAttribute;

@Table(name = "countries")
public class Country {

@Column(name = "country_id")
private  Integer country_id;

@Column(name = "country_name")
private String country_name;

public Country(Integer ...

3. Entity Manager returns duplicate copies of a @OneToMany related Entity

I am developing an application to help my office track and manage reviews. In the application, I am using JPA 2.0 with Hibernate 3.6.3 as my underlying provider. I am also ...

4. LazyInitializationException with OneToMany in the simpliest way

I'm using Hibernate with jpa and I'm getting LazyInizializationException trying to do a very simple thing. I know what does LazyInizializationException means but I can't understand why it comes while i'm ...

5. Entity CRUD w/ OneToMany and orphanRemoval

I am building some CRUD forms for a web application. I have one entity, lets say Part, that has its own fields (sku, price, etc) as well as a link to ...

6. Hibernate: saves object twice into table when connected with an eagerloaded OneToMany

the class rideSingle is always saved multiple times into the db if a OneToMany relationship is set to eager: The class which is saved

@Inheritance(strategy = InheritanceType.TABLE_PER_CLASS)
public class RideSingle  extends HibernateBasicClass{

7. OneToMany problem

private List products; @OneToMany(targetEntity=Product.class, mappedBy="grupa", cascade=CascadeType.ALL) public List getProducts() { return products; } public void setProducts(List products) { this.products = products; }

8. Error book Hibernate Recipes Apress (@OneToMany bidirectional Using a Join Table)

Error book Hibernate Recipes Apress (@OneToMany bidirectional Using a Join Table) The book say: Code: @Entity (name="bkch73") @Table (name="BOOK7_3", schema="BOOKSHOP7") public class Book7_3 { . @OneToMany(targetEntity=Chapter7_3.class,mappedBy="book") @JoinTable(name = "Book_Chapter",schema="BOOKSHOP7", joinColumns = ...

10. Getting mapping error for @OneToMany

Getting mapping error for @OneToMany Hi All, I am new to Spring-ORM. I have two classes: Country and State County is having One to many relationship with State Below is my ...

11. Inline Editing (e.g. OneToMany directly in referencing page)

Inline Editing (e.g. OneToMany directly in referencing page) Hello, I do have some entities which have list attributes. For example, a customer has a list of addresses (private, work, .....). The ...

12. OneToMany Annotation Question/Problem

Jan 25th, 2008, 12:10 PM #1 PretzelLogic View Profile View Forum Posts Private Message Member Join Date Jan 2007 Posts 45 OneToMany Annotation Question/Problem Hello, I'm sure a better place for ...

13. OneToMany mistake

OneToMany mistake Hi, I need to do the @OneToMany. I do like this: Code: package com.uw.diode.entity; import; import java.util.Collection; import java.util.Date; import static javax.persistence.CascadeType.ALL; import javax.persistence.Column; import javax.persistence.Entity; import javax.persistence.GeneratedValue; ...

14. Dynamic OneToMany reference with JPA

Dynamic OneToMany reference with JPA Hi all I'm trying to create a 1-n relation with spring ans JPAwhere the situation is as follows: The Company has a list of persons where ...

15. Exception with OneToMany finder

Exception with OneToMany finder Hi, I love Roo, but there is one area I think needs urgent attention before GA: If we take the simple example of Pizzas with Toppings and ...

17. Retrieve @OneToMany list from a .jsp

Retrieve @OneToMany list from a .jsp Hello, I am doing a project for my university with Spring MVC and Hibernate with JPA. I have 2 entties "Patient" and "History" A patient ...

18. Database Insert Best Practices (JPA & OneToMany)

Database Insert Best Practices (JPA & OneToMany) Currently I'm using JPAItemWriter to process a sample set of 300k records from a CSV flat file. Process time doesn't seem to be an ...

19. @OneToMany

Hi Andrew, Thanks for your reply, yes that is exactly what I was referring to. Is there any update on this? Seem quite strange that such an important relation has been ...

20. @OneToMany without join table

Hi, I've got a very simple unidirectional @OneToMany mapping from CD to its Tracks, and I want to persist it in just 2 tables with a foregin key from referencing ...

21. Design issue with @OneToMany etc.

Design issue with @OneToMany etc. Hi guys, I'm currently learning web applications design using Spring / Hibernate, and I have come across a design issue. The situation is very simple - ...

22. Problem with @OneToMany scaffolded controller

Problem with @OneToMany scaffolded controller I'm trying to use Spring Roo to generate entities with a @OneToMany unidirectional relationship. Here's what I've tried: entity --class field string --fieldName name controller ...

23. OneToMany in JSP

24. NoSuchMethodError: javax/persistence/OneToMany.orphanRemoval()Z

Sep 3rd, 2010, 03:22 PM #1 sheadley View Profile View Forum Posts Private Message Junior Member Join Date May 2005 Posts 11 NoSuchMethodError: javax/persistence/OneToMany.orphanRemoval()Z I am having problems running my unit ...