java - 重复的 XML 条目 | Hibernate orm.xml

Question

这里有一个错误:

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，没有重复项

调试后，我明白，该文件 orm.xml 被读取了两次! 这是确认这个想法的屏幕截图

那么我如何告诉 Hibernate 不要读取该文件两次？

Answer 1

这是一个老问题，但可能是当前的问题，对我来说也是如此......

我遇到了完全相同的问题，并且刚刚发现如果我删除 persistence.xml 中的引用到orm.xml文件，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它也有效。

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

Hibernate 似乎默认会查找这样的文件 ( orm.xml )，并且不会阻止在 persistence.xml 的情况下加载两次。已经提到了。

因此，只需重命名并重新映射它，或者更简单，删除 persistence.xml 中的引用.