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   My persistence xml file is   lt persistence      xmlns  quot http   java sun com xml ns persistence quot      xmlns xsi  quot http   www w3 org 2001 XMLSchema-instance quot      xsi schemaLocation  quot http   java sun com xml ns persistence http   java sun com xml ns persistence persistence 2 0 xsd quot      version  quot 2 0 quot  gt       lt persistence-unit name  quot JPA quot  gt           lt provider gt org hibernate ejb HibernatePersistence lt  provider gt           lt class gt com david Libro lt  class gt           lt class gt com david Categoria lt  class gt           lt properties gt               lt property name  quot hibernate show sql quot  value  quot true quot    gt               lt property name  quot javax persistence transactionType quot  value  quot RESOURCE LOCAL quot    gt               lt property name  quot javax persistence jdbc driver quot  value  quot com mysql jdbc Driver quot    gt               lt property name  quot javax persistence jdbc url quot  value  quot jdbc mysql   localhost arquitecturaJava quot    gt               lt property name  quot javax persistence jdbc user quot  value  quot root quot    gt               lt property name  quot javax persistence jdbc password quot  value  quot root quot    gt               lt property name  quot hibernate dialect quot  value  quot org hibernate dialect MySQL5Dialect quot    gt           lt  properties gt       lt  persistence-unit gt   lt  persistence gt   And i create EntityManagerFactory in  private static EntityManagerFactory buildEntityManagerFactory                  try                        return Persistence createEntityManagerFactory  quot JPA quot                       catch  Throwable ex                                 ex printStackTrace                  throw new RuntimeException  quot Error al crear la factoria de JPA - gt  quot   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  lt clinit gt  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  lt init gt  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    quot Categorias quot   public class Categoria implements Serializable       private static final long serialVersionUID   1L        Id      JoinColumn name    quot categoria quot        private String id      private String descripcion         and  Entity  Table name  quot Libros quot   public class Libro implements Serializable       private static final long serialVersionUID   1L            Id     private String isbn      private String titulo       ManyToOne      JoinColumn  name  quot categoria quot       private Categoria categoria         My file of Hibernate Configuration is   lt  xml version  quot 1 0 quot  encoding  quot UTF-8 quot   gt   lt  DOCTYPE hibernate-configuration PUBLIC  quot -  Hibernate Hibernate Configuration DTD 3 0  EN quot   quot http   hibernate sourceforge net hibernate-configuration-3 0 dtd quot  gt   lt hibernate-configuration gt       lt session-factory gt           lt property name  quot connection driver class quot  gt com mysql jdbc Driver lt  property gt           lt property name  quot connection url quot  gt jdbc mysql   localhost arquitecturajava lt  property gt           lt property name  quot connection username quot  gt root lt  property gt           lt property name  quot connection password quot  gt root lt  property gt           lt property name  quot connection pool size quot  gt 5 lt  property gt           lt property name  quot dialect quot  gt org hibernate dialect MySQL5Dialect lt  property gt           lt property name  quot show sql quot  gt true lt  property gt                    lt mapping class  quot com david Categoria quot  gt  lt  mapping gt           lt mapping class  quot com david Libro quot  gt  lt  mapping gt                lt  session-factory gt   lt  hibernate-configuration gt   Any ideas   Thank  s

User · Accepted Answer

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

User · Answer

It worked for me after adding the following dependency in pom   lt dependency gt    lt groupId gt org hibernate lt  groupId gt    lt artifactId gt hibernate-validator lt  artifactId gt    lt version gt 4 3 0 Final lt  version gt   lt  dependency gt

User · Answer

Suppress the  JoinColumn name  categoria   on the ID field of the Categoria class and I think it will work

User · Answer

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

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

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