JPA With Hibernate Error: [PersistenceUnit: JPA] Unable to build EntityManagerFactory

Question

I have a problem with Java Persistence API and Hibernate. My situation of project is:

enter image description here

My persistence.xml file is:

<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="JPA">
        <provider>org.hibernate.ejb.HibernatePersistence</provider>
        <class>com.david.Libro</class>
        <class>com.david.Categoria</class>
        <properties>
            <property name="hibernate.show_sql" value="true" />
            <property name="javax.persistence.transactionType" value="RESOURCE_LOCAL" />
            <property name="javax.persistence.jdbc.driver" value="com.mysql.jdbc.Driver" />
            <property name="javax.persistence.jdbc.url" value="jdbc:mysql://localhost/arquitecturaJava" />
            <property name="javax.persistence.jdbc.user" value="root" />
            <property name="javax.persistence.jdbc.password" value="root" />
            <property name="hibernate.dialect" value="org.hibernate.dialect.MySQL5Dialect" />
        </properties>
    </persistence-unit>
</persistence>

And i create EntityManagerFactory in:

private static EntityManagerFactory buildEntityManagerFactory() 
    {
        try 
        {
            return Persistence.createEntityManagerFactory("JPA");
        } 
        catch (Throwable ex) 
        {
                    ex.printStackTrace();
            //throw new RuntimeException("Error al crear la factoria de JPA:->"+ ex.getMessage());
        }
    }

My error is about create EntityManagerFactory:

    javax.persistence.PersistenceException: [PersistenceUnit: JPA] Unable to build EntityManagerFactory
    at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:924)
    at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:899)
    at org.hibernate.ejb.HibernatePersistence.createEntityManagerFactory(HibernatePersistence.java:59)
    at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:63)
    at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:47)
    at com.david.JPAHelper.buildEntityManagerFactory(JPAHelper.java:14)
    at com.david.JPAHelper.<clinit>(JPAHelper.java:8)
    at com.david.Categoria.buscarTodos(Categoria.java:93)
    at com.david.FormularioInsertarLibroAccion.ejecutar(FormularioInsertarLibroAccion.java:25)
    at com.david.ControladorLibros.doGet(ControladorLibros.java:38)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:947)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1009)
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
    at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:310)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
    at java.lang.Thread.run(Unknown Source)
Caused by: org.hibernate.DuplicateMappingException: Duplicate class/entity mapping com.david.Libro
    at org.hibernate.cfg.Configuration$MappingsImpl.addClass(Configuration.java:2638)
    at org.hibernate.cfg.AnnotationBinder.bindClass(AnnotationBinder.java:706)
    at org.hibernate.cfg.Configuration$MetadataSourceQueue.processAnnotatedClassesQueue(Configuration.java:3512)
    at org.hibernate.cfg.Configuration$MetadataSourceQueue.processMetadata(Configuration.java:3466)
    at org.hibernate.cfg.Configuration.secondPassCompile(Configuration.java:1355)
    at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1756)
    at org.hibernate.ejb.EntityManagerFactoryImpl.<init>(EntityManagerFactoryImpl.java:96)
    at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:914)
    ... 27 more

Part of Libro and Categoria classes code is:

@Entity
@Table(name = "Categorias")
public class Categoria implements Serializable
{
    private static final long serialVersionUID = 1L;

    @Id
    @JoinColumn(name = "categoria") 
    private String id;
    private String descripcion;

....

and

@Entity
@Table(name="Libros")
public class Libro implements Serializable
{
    private static final long serialVersionUID = 1L;
    
    @Id
    private String isbn;
    private String titulo;
    @ManyToOne
    @JoinColumn (name="categoria")
    private Categoria categoria;

....

My file of Hibernate Configuration is:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
    <session-factory>
        <property name="connection.driver_class">com.mysql.jdbc.Driver</property>
        <property name="connection.url">jdbc:mysql://localhost/arquitecturajava</property>
        <property name="connection.username">root</property>
        <property name="connection.password">root</property>
        <property name="connection.pool_size">5</property>
        <property name="dialect">org.hibernate.dialect.MySQL5Dialect</property>
        <property name="show_sql">true</property>
        
        <mapping class="com.david.Categoria"></mapping>
        <mapping class="com.david.Libro"></mapping>
        
    </session-factory>
</hibernate-configuration>

Any ideas!! Thank´s!!

When rethrowing an exception, it is more useful if you include the original exception as a nested exception, so the original stacktrace can be examined: `new RuntimeException("my message", ex)` — SJuan76, Jun 04 '13 at 16:00
Before throwing a new RuntimeException, print the stacktrace with `ex.printStackTrace();`, or using the (better) strategy commented by @SJuan76. — eternay, Jun 04 '13 at 16:00
You should not catch anything at all. If creation of the `EntityManagerFactory` fails, you cannot recover anyway. — Balázs Németh, Jun 04 '13 at 16:05
I have modified, the show of error with PrintOfTrace. But is the same i don´t know how solve this error. — Davidin073, Jun 04 '13 at 16:11
Your error is: `DuplicateMappingException: Duplicate class/entity mapping com.david.Libro`, as shown by the line `Caused by` in your stacktrace. — eternay, Jun 04 '13 at 16:14
Maybe `Libro` and `Categoria` maps to the same table? Show the classes please. — Balázs Németh, Jun 04 '13 at 16:21
You have to post your `com.david.Libro` entity code so that we can examine the problem. — eternay, Jun 04 '13 at 16:21
"Raised whenever a duplicate for a certain type occurs. Duplicate class, table, property name etc." — Balázs Németh, Jun 04 '13 at 16:23
Classes Libro and Categoria are linked with Hibernate Annotations. The tables of my BD are Libros and Categorias. — Davidin073, Jun 04 '13 at 16:28
Paste your `hibernate.cfg.xml` as well. I think you have mapped your classes both in your `hibernate.cfg.xml` and `persistence.xml`. — Balázs Németh, Jun 04 '13 at 16:35
Balázs Mária Németh, you´re right!!! I´ve deleted this lines in persistence.xml: com.david.Libro com.david.Categoria — Davidin073, Jun 04 '13 at 16:41
OK, see my answer as well and accept if that was the solution please. — Balázs Németh, Jun 04 '13 at 16:42

score 14 · Accepted Answer · answered Jun 04 '13 at 16:37

14

You don't need both hibernate.cfg.xml and persistence.xml in this case. Have you tried removing hibernate.cfg.xml and mapping everything in persistence.xml only?

But as the other answer also pointed out, this is not okay like this:

@Id
@JoinColumn(name = "categoria") 
private String id;

Didn't you want to use @Column instead?

answered Jun 04 '13 at 16:37

Balázs Németh

6,222
9
45
60

If you dont add @Column, Hibernate catch all of yours properties as columns. If i delete hibernate.cfg.xml i cant access to my BD. " /hibernate.cfg.xml not found" – Davidin073 Jun 04 '13 at 16:46
For other hand if i dont delete hibernate.cfg.xml and comment classes links in persistence.xml the error is "Transaction not active" – Davidin073 Jun 04 '13 at 16:49
Have a look at this post as well: http://stackoverflow.com/questions/3807503/what-is-the-purpose-of-two-config-files-for-hibernate You don't need both. You should go with your persistence.xml. But maybe it's not correctly configured! But the issue was because of what I told you I guess :) – Balázs Németh Jun 04 '13 at 16:50
Ok, part of Hibernate is true. Its necesary delete hibernate.cfg.xml. But my error: " javax.persistence.PersistenceException: [PersistenceUnit: JPA] Unable to build EntityManagerFactory" and "Duplicate class/entity mapping com.david.Libro" not solve... – Davidin073 Jun 04 '13 at 17:14
Finally found!! Supress hibernate.cfg.xml and hbm files but not delete @JoinColumn annotations. Thank´s!! – Davidin073 Jun 04 '13 at 18:24

score 1 · Answer 2 · answered Jun 04 '13 at 16:28

1

Suppress the @JoinColumn(name="categoria") on the ID field of the Categoria class and I think it will work.

answered Jun 04 '13 at 16:28

eternay

3,754
2
29
27

Is the same, with o without this line in Categoria or Libro, the error is the same. – Davidin073 Jun 04 '13 at 16:33
After delete hibernate.cfg.xml and delete @JoinColumn annotation od Categoria, the error is " org.hibernate.DuplicateMappingException: Duplicate class/entity mapping com.david.Libro"...i don´t know why.. – Davidin073 Jun 04 '13 at 17:27

score 0 · Answer 3 · edited Sep 11 '20 at 08:54

0

It worked for me after adding the following dependency in pom,

<dependency>
 <groupId>org.hibernate</groupId>
 <artifactId>hibernate-validator</artifactId>
 <version>4.3.0.Final</version>
</dependency>

edited Sep 11 '20 at 08:54

mrBen

276
1
5
15

answered Jan 23 '15 at 17:13

Vinit Bhardwaj · Answer 4 · 2017-02-04T06:09:11.857

Use above annotation if someone is facing :--org.hibernate.jpa.HibernatePersistenceProvider persistence provider when it attempted to create the container entity manager factory for the paymentenginePU persistence unit. The following error occurred: [PersistenceUnit: paymentenginePU] Unable to build Hibernate SessionFactory ** This is a solution if you are using Audit table.@Audit

Use:- @Audited(targetAuditMode = RelationTargetAuditMode.NOT_AUDITED) on superclass.

JPA With Hibernate Error: [PersistenceUnit: JPA] Unable to build EntityManagerFactory

4 Answers4