BAEL-6189 - Remove Entity with ManyToMany Relationship in JPA (#13634)
* BAEL-6189 - Remove Entity with ManyToMany Relationship in JPA * Add property source
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apeterlic
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@ -101,7 +101,7 @@
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<properties>
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<!-- Spring -->
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<org.springframework.version>5.1.5.RELEASE</org.springframework.version>
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<org.springframework.version>5.2.0.RELEASE</org.springframework.version>
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<spring-boot.version>2.2.6.RELEASE</spring-boot.version>
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<!-- persistence -->
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<tomcat-dbcp.version>9.0.0.M26</tomcat-dbcp.version>
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@ -0,0 +1,12 @@
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package com.baeldung.manytomanyremoval;
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import org.springframework.boot.SpringApplication;
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import org.springframework.boot.autoconfigure.SpringBootApplication;
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@SpringBootApplication
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public class Application {
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public static void main(String[] args) {
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SpringApplication.run(Application.class, args);
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}
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}
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@ -0,0 +1,62 @@
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package com.baeldung.manytomanyremoval;
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import javax.persistence.*;
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import java.util.HashSet;
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import java.util.Set;
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@Entity
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@Table(name = "author")
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public class Author {
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@Id
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@GeneratedValue(strategy = GenerationType.IDENTITY)
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@Column(name = "id")
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private Long id;
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@Column(name = "name")
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private String name;
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@ManyToMany(mappedBy = "authors")
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private Set<Book> books = new HashSet<>();
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// standard getters and setters
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public Author() {
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}
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public Author(String name) {
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this.name = name;
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}
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public Long getId() {
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return id;
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}
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public void setId(Long id) {
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this.id = id;
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}
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public String getName() {
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return name;
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}
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public void setName(String name) {
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this.name = name;
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}
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public Set<Book> getBooks() {
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return books;
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}
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public void setBooks(Set<Book> books) {
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this.books = books;
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}
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@PreRemove
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private void removeBookAssociations() {
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for (Book book : this.books) {
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book.getAuthors().remove(this);
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}
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}
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}
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@ -0,0 +1,65 @@
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package com.baeldung.manytomanyremoval;
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import javax.persistence.*;
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import java.util.HashSet;
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import java.util.Set;
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@Entity
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@Table(name = "book")
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public class Book {
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@Id
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@GeneratedValue(strategy = GenerationType.IDENTITY)
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@Column(name = "id")
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private Long id;
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@Column(name = "title")
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private String title;
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@ManyToMany(cascade = {CascadeType.PERSIST, CascadeType.MERGE})
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@JoinTable(name = "book_author",
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joinColumns = @JoinColumn(name = "book_id"),
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inverseJoinColumns = @JoinColumn(name = "author_id")
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)
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private Set<Author> authors = new HashSet<>();
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// standard getters and setters
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public Book() {
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}
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public Book(String title) {
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this.title = title;
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}
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public Long getId() {
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return id;
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}
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public void setId(Long id) {
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this.id = id;
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}
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public String getTitle() {
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return title;
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}
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public void setTitle(String title) {
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this.title = title;
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}
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public Set<Author> getAuthors() {
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return authors;
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}
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public void removeAuthor(Author author) {
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this.authors.remove(author);
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author.getBooks().remove(this);
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}
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public void addAuthor(Author author) {
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authors.add(author);
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author.getBooks().add(this);
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}
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}
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@ -0,0 +1,41 @@
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package com.baeldung.manytomanyremoval;
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import javax.persistence.*;
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@Entity
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@Table(name = "category")
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public class Category {
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@Id
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@GeneratedValue(strategy = GenerationType.IDENTITY)
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@Column(name = "id")
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private Long id;
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@Column(name = "name")
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private String name;
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// getters and setters
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public Category() {
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}
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public Category(String name) {
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this.name = name;
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}
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public Long getId() {
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return id;
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}
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public void setId(Long id) {
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this.id = id;
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}
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public String getName() {
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return name;
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}
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public void setName(String name) {
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this.name = name;
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}
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}
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@ -0,0 +1,59 @@
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package com.baeldung.manytomanyremoval;
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import javax.persistence.*;
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import java.util.HashSet;
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import java.util.Set;
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@Entity
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@Table(name = "post")
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public class Post {
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@Id
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@GeneratedValue(strategy = GenerationType.IDENTITY)
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@Column(name = "id")
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private Long id;
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@Column(name = "title")
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private String title;
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@ManyToMany(cascade = {CascadeType.PERSIST, CascadeType.MERGE, CascadeType.REFRESH})
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@JoinTable(name = "post_category",
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joinColumns = @JoinColumn(name = "post_id"),
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inverseJoinColumns = @JoinColumn(name = "category_id")
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)
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private Set<Category> categories = new HashSet<>();
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// getters and setters
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public Post(String title) {
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this.title = title;
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}
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public Post() {
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}
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public Long getId() {
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return id;
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}
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public void setId(Long id) {
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this.id = id;
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}
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public String getTitle() {
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return title;
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}
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public void setTitle(String title) {
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this.title = title;
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}
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public Set<Category> getCategories() {
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return categories;
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}
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public void setCategories(Set<Category> categories) {
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this.categories = categories;
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}
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}
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@ -0,0 +1,78 @@
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package com.baeldung.manytomanyremoval;
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import org.junit.jupiter.api.Assertions;
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import org.junit.jupiter.api.BeforeEach;
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import org.junit.jupiter.api.Test;
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import org.junit.jupiter.api.extension.ExtendWith;
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import org.springframework.beans.factory.annotation.Autowired;
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import org.springframework.test.annotation.DirtiesContext;
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import org.springframework.test.context.ContextConfiguration;
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import org.springframework.test.context.junit.jupiter.SpringExtension;
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import org.springframework.transaction.annotation.Transactional;
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import javax.persistence.EntityManager;
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@ExtendWith(SpringExtension.class)
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@ContextConfiguration(classes = TestContextConfig.class)
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@DirtiesContext(classMode = DirtiesContext.ClassMode.BEFORE_EACH_TEST_METHOD)
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@Transactional
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class BidirectionalRemovalUnitTest {
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@Autowired
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private EntityManager entityManager;
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@BeforeEach
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void init() {
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Author author1 = new Author("Erich Gamma");
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Author author2 = new Author("John Vlissides");
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Author author3 = new Author("Ralph Johnson");
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Author author4 = new Author("Richard Helm");
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Book book = new Book();
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book.setTitle("GOF Java");
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book.addAuthor(author1);
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book.addAuthor(author2);
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book.addAuthor(author3);
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book.addAuthor(author4);
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entityManager.persist(book);
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Book book2 = new Book();
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book2.setTitle("A Lost Age");
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book2.addAuthor(author3);
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entityManager.persist(book2);
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}
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@Test
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void givenEntities_whenRemoveFromOwner_thenRemoveAssociation() {
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Author author = (Author) entityManager
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.createQuery("SELECT author from Author author where author.name = ?1")
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.setParameter(1, "Ralph Johnson")
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.getSingleResult();
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Book book1 = entityManager.find(Book.class, 1L);
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Book book2 = entityManager.find(Book.class, 2L);
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book1.removeAuthor(author);
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entityManager.persist(book1);
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Assertions.assertEquals(3, book1.getAuthors().size());
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Assertions.assertEquals(1, book2.getAuthors().size());
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}
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@Transactional
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@Test
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void givenEntities_whenRemoveFromNotOwner_thenRemoveAssociation() {
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Author author = (Author) entityManager
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.createQuery("SELECT author from Author author where author.name = ?1")
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.setParameter(1, "Ralph Johnson")
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.getSingleResult();
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Book book1 = entityManager.find(Book.class, 1L);
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Book book2 = entityManager.find(Book.class, 2L);
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entityManager.remove(author);
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Assertions.assertEquals(3, book1.getAuthors().size());
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Assertions.assertEquals(0, book2.getAuthors().size());
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}
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}
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@ -0,0 +1,12 @@
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package com.baeldung.manytomanyremoval;
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import org.springframework.context.annotation.ComponentScan;
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import org.springframework.context.annotation.Configuration;
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import org.springframework.context.annotation.PropertySource;
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@Configuration
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@PropertySource("classpath:/manytomanyremoval/test.properties")
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@ComponentScan("com.baeldung.manytomanyremoval")
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public class TestContextConfig {
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}
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package com.baeldung.manytomanyremoval;
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import org.junit.jupiter.api.Assertions;
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import org.junit.jupiter.api.BeforeEach;
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import org.junit.jupiter.api.Test;
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import org.junit.jupiter.api.extension.ExtendWith;
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import org.springframework.beans.factory.annotation.Autowired;
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import org.springframework.test.annotation.DirtiesContext;
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import org.springframework.test.context.ContextConfiguration;
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import org.springframework.test.context.junit.jupiter.SpringExtension;
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import org.springframework.transaction.annotation.Transactional;
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import javax.persistence.EntityManager;
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@ExtendWith(SpringExtension.class)
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@ContextConfiguration(classes = TestContextConfig.class)
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@DirtiesContext(classMode = DirtiesContext.ClassMode.BEFORE_EACH_TEST_METHOD)
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@Transactional
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class UnidirectionalRemovalUnitTest {
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@Autowired
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private EntityManager entityManager;
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@BeforeEach
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void init() {
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Category category1 = new Category("JPA");
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Category category2 = new Category("Persistence");
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Post post1 = new Post("Many-to-Many Relationship");
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post1.getCategories().add(category1);
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post1.getCategories().add(category2);
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Post post2 = new Post("Entity Manager");
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post2.getCategories().add(category1);
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entityManager.persist(post1);
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entityManager.persist(post2);
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Assertions.assertEquals(2, post1.getCategories().size());
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Assertions.assertEquals(1, post2.getCategories().size());
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}
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@Test
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void givenEntities_whenRemove_thenRemoveAssociation() {
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Post post1 = entityManager.find(Post.class, 1L);
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Post post2 = entityManager.find(Post.class, 2L);
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Category category = entityManager.find(Category.class, 1L);
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post1.getCategories().remove(category);
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Assertions.assertEquals(1, post1.getCategories().size());
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Assertions.assertEquals(1, post2.getCategories().size());
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}
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}
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@ -0,0 +1,11 @@
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spring.datasource.url=jdbc:h2:mem:mydb;MODE=LEGACY;
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spring.datasource.driverClassName=org.h2.Driver
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spring.datasource.username=sa
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spring.datasource.password=
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hibernate.dialect=org.hibernate.dialect.H2Dialect
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hibernate.hbm2ddl.auto=none
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spring.jpa.show-sql=true
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spring.jpa.hibernate.dialect=org.hibernate.dialect.H2Dialect
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spring.jpa.hibernate.ddl-auto=create-drop
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