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Java Hibernate Basics Persisting Data with Hibernate Saving Data with Hibernate

Unable to create requested service, Unable to load class

I got this error:

kesäk. 04, 2019 8:29:26 AP. org.hibernate.Version logVersion
INFO: HHH000412: Hibernate Core {6.0.0.Alpha2}
kesäk. 04, 2019 8:29:26 AP. org.hibernate.cfg.Environment <clinit>
INFO: HHH000206: hibernate.properties not found
kesäk. 04, 2019 8:29:27 AP. org.hibernate.annotations.common.reflection.java.JavaReflectionManager <clinit>
INFO: HCANN000001: Hibernate Commons Annotations {5.1.0.Final}
kesäk. 04, 2019 8:29:27 AP. org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl configure
WARN: HHH10001002: Using Hibernate built-in connection pool (not for production use!)
Exception in thread "main" java.lang.ExceptionInInitializerError
Caused by: org.hibernate.service.spi.ServiceException: Unable to create requested service [org.hibernate.engine.jdbc.env.spi.JdbcEnvironment]
    at org.hibernate.service.internal.AbstractServiceRegistryImpl.createService(AbstractServiceRegistryImpl.java:275)
    at org.hibernate.service.internal.AbstractServiceRegistryImpl.initializeService(AbstractServiceRegistryImpl.java:237)
    at org.hibernate.service.internal.AbstractServiceRegistryImpl.getService(AbstractServiceRegistryImpl.java:214)
    at org.hibernate.boot.model.relational.Database.<init>(Database.java:41)
    at org.hibernate.boot.internal.InFlightMetadataCollectorImpl.getDatabase(InFlightMetadataCollectorImpl.java:216)
    at org.hibernate.boot.internal.InFlightMetadataCollectorImpl.<init>(InFlightMetadataCollectorImpl.java:187)
    at org.hibernate.boot.model.process.spi.MetadataBuildingProcess.complete(MetadataBuildingProcess.java:123)
    at org.hibernate.boot.model.process.spi.MetadataBuildingProcess.build(MetadataBuildingProcess.java:88)
    at org.hibernate.boot.internal.MetadataBuilderImpl.build(MetadataBuilderImpl.java:401)
    at org.hibernate.boot.internal.MetadataBuilderImpl.build(MetadataBuilderImpl.java:79)
    at org.hibernate.boot.MetadataSources.buildMetadata(MetadataSources.java:190)
    at contactmgr.Application.buildSessionFactory(Application.java:33)
    at contactmgr.Application.<clinit>(Application.java:19)
Caused by: org.hibernate.boot.registry.classloading.spi.ClassLoadingException: Unable to load class [org.h2.Driver]
    at org.hibernate.boot.registry.classloading.internal.ClassLoaderServiceImpl.classForName(ClassLoaderServiceImpl.java:136)
    at org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl.loadDriverIfPossible(DriverManagerConnectionProviderImpl.java:149)
    at org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl.buildCreator(DriverManagerConnectionProviderImpl.java:105)
    at org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl.buildPool(DriverManagerConnectionProviderImpl.java:89)
    at org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl.configure(DriverManagerConnectionProviderImpl.java:73)
    at org.hibernate.boot.registry.internal.StandardServiceRegistryImpl.configureService(StandardServiceRegistryImpl.java:100)
    at org.hibernate.service.internal.AbstractServiceRegistryImpl.initializeService(AbstractServiceRegistryImpl.java:246)
    at org.hibernate.service.internal.AbstractServiceRegistryImpl.getService(AbstractServiceRegistryImpl.java:214)
    at org.hibernate.engine.jdbc.env.internal.JdbcEnvironmentInitiator.buildJdbcConnectionAccess(JdbcEnvironmentInitiator.java:178)
    at org.hibernate.engine.jdbc.env.internal.JdbcEnvironmentInitiator.initiateService(JdbcEnvironmentInitiator.java:102)
    at org.hibernate.engine.jdbc.env.internal.JdbcEnvironmentInitiator.initiateService(JdbcEnvironmentInitiator.java:35)
    at org.hibernate.boot.registry.internal.StandardServiceRegistryImpl.initiateService(StandardServiceRegistryImpl.java:94)
    at org.hibernate.service.internal.AbstractServiceRegistryImpl.createService(AbstractServiceRegistryImpl.java:263)
    ... 12 more
Caused by: java.lang.ClassNotFoundException: Could not load requested class : org.h2.Driver
    at org.hibernate.boot.registry.classloading.internal.AggregatedClassLoader.findClass(AggregatedClassLoader.java:210)
    at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:588)
    at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:521)
    at java.base/java.lang.Class.forName0(Native Method)
    at java.base/java.lang.Class.forName(Class.java:415)
    at org.hibernate.boot.registry.classloading.internal.ClassLoaderServiceImpl.classForName(ClassLoaderServiceImpl.java:133)
    ... 24 more

Here is my hibernate.cfg.xml file:

<?xml version='1.0' encoding='utf-8'?>

<!DOCTYPE hibernate-configuration PUBLIC
        "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
        "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">

<hibernate-configuration>
    <session-factory>
        <!-- Database connection setting -->
        <property name="connection.driver_class">org.h2.Driver</property>

        <property name="connection.url">jdbc:h2:./data/contactmgr</property>

        <!-- SQL dialect -->
        <property name="dialect">org.hibernate.dialect.H2Dialect"</property>

        <!-- Create the database schema on startup -->
        <property name="hbm2ddl.auto">create</property>

        <!-- Show the queries prepared by Hibernate -->
        <property name="show_sql">true</property>

        <!-- Names the annotated entity classes -->
        <mapping class="contactmgr.model.Contact" />
    </session-factory>
</hibernate-configuration>

And here is my Application.java:

package contactmgr;


import contactmgr.model.Contact;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.boot.MetadataSources;
import org.hibernate.boot.registry.StandardServiceRegistryBuilder;
import org.hibernate.service.ServiceRegistry;


public class Application {
    // Hold a reusable reference to a SessionFactory (since we need only one)
    private static final SessionFactory sessionFactory = buildSessionFactory();


    private static SessionFactory buildSessionFactory() {
        // Create a StandardServiceRegistry
        final ServiceRegistry registry = new StandardServiceRegistryBuilder().configure().build();
        return new MetadataSources(registry).buildMetadata().buildSessionFactory();
    }

    public static void main(String[] args) {
        Contact contact = new Contact.ContactBuilder("x", "x")
                .withEmail("x@x.x")
                .withPhone(1234567L)
                .build();
        // Open a session
        Session session = sessionFactory.openSession();

        // Begin a transaction
        session.beginTransaction();

        // Use the session to save the contact
        session.save(contact);

        // Commit the transaction
        session.getTransaction().commit();

        // Close the session
        session.close();
    }
}

And Contact.java:

package contactmgr.model;

import javax.persistence.*;

@Entity
public class Contact {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private int id;

    @Column
    private String firstName;

    @Column
    private String lastName;

    @Column
    private String email;

    @Column
    private Long phone;

    // Default constructor for JPA
    public Contact() {}

    public Contact(ContactBuilder builder) {
        this.firstName = builder.firstName;
        this.lastName = builder.lastName;
        this.email = builder.email;
        this.phone = builder.phone;
    }

    @Override
    public String toString() {
        return "Contact{" +
                "id=" + id +
                ", firstName='" + firstName + '\'' +
                ", lastName='" + lastName + '\'' +
                ", email='" + email + '\'' +
                ", phone=" + phone +
                '}';
    }

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getFirstName() {
        return firstName;
    }

    public void setFirstName(String firstName) {
        this.firstName = firstName;
    }

    public String getLastName() {
        return lastName;
    }

    public void setLastName(String lastName) {
        this.lastName = lastName;
    }

    public String getEmail() {
        return email;
    }

    public void setEmail(String email) {
        this.email = email;
    }

    public Long getPhone() {
        return phone;
    }

    public void setPhone(Long phone) {
        this.phone = phone;
    }

    public static class ContactBuilder {
        private String firstName;
        private String lastName;
        private String email;
        private Long phone;

        public ContactBuilder(String firstName, String lastName) {
            this.firstName = firstName;
            this.lastName = lastName;
        }

        public ContactBuilder withEmail(String email) {
            this.email = email;
            return this;
        }

        public ContactBuilder withPhone(Long phone) {
            this.phone = phone;
            return this;
        }

        public Contact build(){
            return new Contact(this);
        }
    }
}

And dependencies file:

plugins {
    id 'java'
}

version '1.0-SNAPSHOT'

sourceCompatibility = 1.8

repositories {
    mavenCentral()
}

dependencies {
    compile group: 'org.hibernate.orm', name: 'hibernate-core', version: '6.0.0.Alpha2'
    testCompile group: 'com.h2database', name: 'h2', version: '1.4.199'
    compile group: 'javax.transaction', name: 'jta', version: '1.1'

    compile group: 'javax.xml.bind', name: 'jaxb-api', version: '2.4.0-b180830.0359'
    compile group: 'com.sun.xml.bind', name: 'jaxb-impl', version: '2.4.0-b180830.0438'
    compile group: 'com.sun.xml.bind', name: 'jaxb-core', version: '2.3.0.1'
    compile group: 'javax.activation', name: 'activation', version: '1.1.1'
    compile group: 'org.olap4j', name: 'olap4j', version: '1.2.0'
}
Pablo Wedemann Colchiesqui
Pablo Wedemann Colchiesqui
9,187 Points

I'm having the exact same problem, did you find a solution?

1 Answer

Pablo Wedemann Colchiesqui
Pablo Wedemann Colchiesqui
9,187 Points

found the error, change "testCompile" in gradle to "compile". Worked for me.

Alex z
Alex z
9,027 Points

or change H2 testimplementation to implementation in build gradle