Example on how to persist recursive relationships with Hibernate, using in this case a UUIDGenerator
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Forked from jwgmeligmeyling/DatabaseTestModule.java
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October 12, 2021 17:19
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Persisting recursive relationships with Hibernate
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package org.hibernate.test; | |
import com.google.inject.AbstractModule; | |
import com.google.inject.Inject; | |
import com.google.inject.Singleton; | |
import com.google.inject.persist.PersistService; | |
import com.google.inject.persist.jpa.JpaPersistModule; | |
public class DatabaseTestModule extends AbstractModule { | |
@Override | |
protected void configure() { | |
install(new JpaPersistModule("default")); | |
bind(JPAInitializer.class).asEagerSingleton(); | |
} | |
@Singleton | |
public static class JPAInitializer { | |
@Inject | |
public JPAInitializer(final PersistService service) { | |
service.start(); | |
} | |
} | |
} |
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package org.hibernate.test; | |
import lombok.Data; | |
import lombok.EqualsAndHashCode; | |
import lombok.ToString; | |
import org.hibernate.annotations.GenericGenerator; | |
import javax.persistence.CascadeType; | |
import javax.persistence.Column; | |
import javax.persistence.Entity; | |
import javax.persistence.FetchType; | |
import javax.persistence.GeneratedValue; | |
import javax.persistence.Id; | |
import javax.persistence.JoinColumn; | |
import javax.persistence.ManyToOne; | |
import javax.persistence.OneToMany; | |
import javax.persistence.Table; | |
import java.util.List; | |
@Data | |
@Entity | |
@Table(name = "node") | |
@ToString(exclude = {"parent"}) | |
@EqualsAndHashCode(of = {"uuid"}) | |
public class Node { | |
@Id | |
@GeneratedValue(generator = "uuid") | |
@GenericGenerator(name = "uuid", strategy = "org.hibernate.id.UUIDGenerator") | |
@Column(name = "uuid") | |
private String uuid; | |
@ManyToOne(cascade = CascadeType.ALL) | |
@JoinColumn(name = "parent", referencedColumnName = "uuid") | |
private Node parent; | |
@OneToMany(mappedBy = "parent", fetch = FetchType.EAGER, cascade = CascadeType.ALL) | |
private List<Node> children; | |
} |
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<persistence xmlns="http://java.sun.com/xml/ns/persistence" | |
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" | |
xsi:schemaLocation="http://java.sun.com/xml/ns/persistence | |
http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd" | |
version="2.0"> | |
<persistence-unit name="default" transaction-type="RESOURCE_LOCAL"> | |
<provider>org.hibernate.jpa.HibernatePersistenceProvider</provider> | |
<properties> | |
<property name="hibernate.archive.autodetection" value="class" /> | |
<property name="hibernate.hbm2ddl.auto" value="create"/> | |
<property name="hibernate.dialect" value="org.hibernate.dialect.H2Dialect"/> | |
<property name="hibernate.connection.driver_class" value="org.h2.Driver"/> | |
<property name="hibernate.connection.url" value="jdbc:h2:./recursion-test" /> | |
<property name="hibernate.connection.user" value="admin" /> | |
</properties> | |
</persistence-unit> | |
</persistence> |
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<?xml version="1.0" encoding="UTF-8"?> | |
<project xmlns="http://maven.apache.org/POM/4.0.0" | |
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" | |
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> | |
<modelVersion>4.0.0</modelVersion> | |
<groupId>hibernate.test</groupId> | |
<artifactId>test-recursion</artifactId> | |
<version>1.0-SNAPSHOT</version> | |
<description>Example to show how to persist recursive relationships with Hibernate.</description> | |
<developers> | |
<developer> | |
<name>Jan-Willem Gmelig Meyling</name> | |
<email>jan-willem@youngmediaexperts.nl</email> | |
</developer> | |
</developers> | |
<properties> | |
<maven.compiler.source>1.8</maven.compiler.source> | |
<maven.compiler.target>1.8</maven.compiler.target> | |
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> | |
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding> | |
<hibernate.version>5.1.0.Final</hibernate.version> | |
<guice.version>4.0</guice.version> | |
</properties> | |
<dependencies> | |
<dependency> | |
<groupId>org.hibernate</groupId> | |
<artifactId>hibernate-core</artifactId> | |
<version>${hibernate.version}</version> | |
</dependency> | |
<dependency> | |
<groupId>org.hibernate</groupId> | |
<artifactId>hibernate-entitymanager</artifactId> | |
<version>${hibernate.version}</version> | |
</dependency> | |
<dependency> | |
<groupId>com.h2database</groupId> | |
<artifactId>h2</artifactId> | |
<version>1.4.191</version> | |
</dependency> | |
<dependency> | |
<groupId>com.google.inject</groupId> | |
<artifactId>guice</artifactId> | |
<version>${guice.version}</version> | |
</dependency> | |
<dependency> | |
<groupId>com.google.inject.extensions</groupId> | |
<artifactId>guice-persist</artifactId> | |
<version>${guice.version}</version> | |
</dependency> | |
<dependency> | |
<groupId>org.projectlombok</groupId> | |
<artifactId>lombok</artifactId> | |
<version>1.16.6</version> | |
<scope>provided</scope> | |
</dependency> | |
<dependency> | |
<groupId>junit</groupId> | |
<artifactId>junit</artifactId> | |
<version>4.11</version> | |
<scope>test</scope> | |
</dependency> | |
<dependency> | |
<groupId>org.hamcrest</groupId> | |
<artifactId>hamcrest-library</artifactId> | |
<version>1.3</version> | |
<scope>test</scope> | |
</dependency> | |
<dependency> | |
<groupId>org.jukito</groupId> | |
<artifactId>jukito</artifactId> | |
<version>1.4.1</version> | |
<scope>test</scope> | |
</dependency> | |
</dependencies> | |
</project> |
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package org.hibernate.test; | |
import com.google.inject.persist.Transactional; | |
import org.jukito.JukitoRunner; | |
import org.jukito.UseModules; | |
import org.junit.Test; | |
import org.junit.runner.RunWith; | |
import javax.inject.Inject; | |
import javax.persistence.EntityManager; | |
import java.util.ArrayList; | |
import java.util.List; | |
import static org.junit.Assert.assertThat; | |
import static org.hamcrest.Matchers.iterableWithSize; | |
@RunWith(JukitoRunner.class) | |
@UseModules(DatabaseTestModule.class) | |
public class RecursiveDependencyTest { | |
@Inject EntityManager entityManager; | |
@Test | |
@Transactional | |
public void testBiDirectionalPersistenceWithUUIDGenerator() throws Exception { | |
Node parent = new Node(); | |
Node child = new Node(); | |
// Add child to parents children | |
List<Node> parentsChildren = new ArrayList<>(); | |
parentsChildren.add(child); | |
parent.setChildren(parentsChildren); | |
// Set back reference as well | |
child.setParent(parent); | |
entityManager.persist(parent); | |
assertThat(parent.getChildren(), iterableWithSize(1)); | |
} | |
} |
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