Question

这是一个错误：

Exception in thread "main" javax.persistence.PersistenceException: Unable to build entity manager factory
    at org.hibernate.jpa.HibernatePersistenceProvider.createEntityManagerFactory(HibernatePersistenceProvider.java:66)
    at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:55)
    at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:39)
    at ru.leon0399.podius.home.Core.run(Core.java:39)
    at ru.leon0399.podius.home.Core.main(Core.java:34)
Caused by: java.lang.IllegalStateException: Duplicate XML entry for ru.leon0399.podius.common.entity.AbstractEntity
    at org.hibernate.cfg.annotations.reflection.XMLContext.addClass(XMLContext.java:140)
    at org.hibernate.cfg.annotations.reflection.XMLContext.addDocument(XMLContext.java:108)
    at org.hibernate.boot.model.source.internal.annotations.AnnotationMetadataSourceProcessorImpl.<init>(AnnotationMetadataSourceProcessorImpl.java:93)
    at org.hibernate.boot.model.process.spi.MetadataBuildingProcess$1.<init>(MetadataBuildingProcess.java:147)
    at org.hibernate.boot.model.process.spi.MetadataBuildingProcess.complete(MetadataBuildingProcess.java:141)
    at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.metadata(EntityManagerFactoryBuilderImpl.java:857)
    at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.build(EntityManagerFactoryBuilderImpl.java:884)
    at org.hibernate.jpa.HibernatePersistenceProvider.createEntityManagerFactory(HibernatePersistenceProvider.java:58)
    ... 4 more

这是我的orm.xml：

<?xml version="1.0" encoding="UTF-8"?>
<entity-mappings
    xmlns="http://java.sun.com/xml/ns/persistence/orm"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/persistence/orm_2_0.xsd"
    version="2.0">
<mapped-superclass class="ru.leon0399.podius.common.entity.AbstractEntity">
    <attributes>
        <id name="uuid">
            <column name="uuid" column-definition="BINARY(16)"/>
        </id>
        <basic name="createdAt">
            <column name="created_at" updatable="false"/>
            <temporal>TIMESTAMP</temporal>
        </basic>
        <basic name="updatedAt">
            <column name="updated_at"/>
            <temporal>TIMESTAMP</temporal>
        </basic>
    </attributes>
</mapped-superclass>

这是我的AbstractEntity类

public abstract class AbstractEntity implements Creatable, Updatable, Entity {
    private static final long serialVersionUID = 2544875895016856663L;

    private static final Logger LOGGER = LoggerFactory.getLogger(AbstractEntity.class);

    private UUID uuid = UUID.randomUUID();

    private Date updatedAt;

    private Date createdAt;

    // Getters and setters
}

如您所见，没有重复

调试后，据我所知，该文件orm.xml读了两次！这是一个确认这个想法的屏幕截图

那我怎么能告诉Hibernate不要两次读这个文件呢？

Answer 1

这是一个老问题，但对我来说可能是当前的问题......

我遇到了完全相同的问题，并且刚刚想出如果我将persistence.xml中的引用移到orm.xml文件中，它就会停止发生。

<mapping-file>./META-INF/orm.xml</mapping-file>

或者，如果我将其重命名为mapping.xml而不是orm.xml，并将其重新映射到persistence.xml它也可以。

<mapping-file>./META-INF/mapping.xml</mapping-file>

Hibernate默认情况下会查找这样的文件（orm.xml），并且在persistence.xml已提及它的情况下不会阻止加载两次。

因此，只需将其重命名并重新映射，或者更容易删除persistence.xml中的引用。

重复的XML条目| Hibernate orm.xml

1 个答案: