Question

使用EclipseLink JPA-RS的静态嵌套类时遇到问题。我有一个简单的JPA实体类

@Entity
@XmlAccessorType(XmlAccessType.FIELD)
public class Inventory {

    @Id
    private Integer id;

    @ElementCollection
    private List<Item> items;

    @Embeddable
    @XmlAccessorType(XmlAccessType.FIELD)
    public static class Item {

    }

}

这是持久性单元中唯一的类。当我尝试通过GET请求检索实体时，我在日志中看到以下异常：

Dec 6, 2014 4:50:38 AM org.eclipse.persistence.jpa.rs.util.JPARSLogger exception
FINER: An Exception was thrown while creating a JPA persistence context for persistence unit: [inventory]: [Exception [EclipseLink-50007] (Eclipse Persistence Services - 2.4.2.v20130514-5956486): org.eclipse.persistence.exceptions.JAXBException
Exception Description: Name collision.  Two classes have the XML type with uri  and name item.]
Local Exception Stack: 
Exception [EclipseLink-50007] (Eclipse Persistence Services - 2.4.2.v20130514-5956486): org.eclipse.persistence.exceptions.JAXBException
Exception Description: Name collision.  Two classes have the XML type with uri  and name item.
    at org.eclipse.persistence.exceptions.JAXBException.nameCollision(JAXBException.java:213)
    at org.eclipse.persistence.jaxb.compiler.AnnotationsProcessor.processTypeQName(AnnotationsProcessor.java:1727)
    at org.eclipse.persistence.jaxb.compiler.AnnotationsProcessor.buildTypeInfo(AnnotationsProcessor.java:754)
    at org.eclipse.persistence.jaxb.compiler.AnnotationsProcessor.postBuildTypeInfo(AnnotationsProcessor.java:680)
    at org.eclipse.persistence.jaxb.compiler.AnnotationsProcessor.buildNewTypeInfo(AnnotationsProcessor.java:4614)
    at org.eclipse.persistence.jaxb.compiler.AnnotationsProcessor.processPropertyTypes(AnnotationsProcessor.java:1058)
    at org.eclipse.persistence.jaxb.compiler.AnnotationsProcessor.processPropertyTypes(AnnotationsProcessor.java:1005)
    at org.eclipse.persistence.jaxb.compiler.XMLProcessor.processXML(XMLProcessor.java:424)
    at org.eclipse.persistence.jaxb.compiler.Generator.<init>(Generator.java:103)
    at org.eclipse.persistence.jaxb.dynamic.DynamicJAXBContext$MetadataContextInput.createContextState(DynamicJAXBContext.java:235)
    at org.eclipse.persistence.jaxb.JAXBContext.<init>(JAXBContext.java:169)
    at org.eclipse.persistence.jaxb.dynamic.DynamicJAXBContext.<init>(DynamicJAXBContext.java:70)
    at org.eclipse.persistence.jaxb.dynamic.DynamicJAXBContextFactory.createContextFromOXM(DynamicJAXBContextFactory.java:347)
    at org.eclipse.persistence.jpa.rs.PersistenceContext.createDynamicJAXBContext(PersistenceContext.java:256)
    at org.eclipse.persistence.jpa.rs.PersistenceContext.<init>(PersistenceContext.java:169)
    at org.eclipse.persistence.jpa.rs.PersistenceFactoryBase.bootstrapPersistenceContext(PersistenceFactoryBase.java:56)
    at org.eclipse.persistence.jpa.rs.PersistenceFactoryBase.get(PersistenceFactoryBase.java:133)
    at org.eclipse.persistence.jpa.rs.resources.common.AbstractResource.getPersistenceContext(AbstractResource.java:206)
    at org.eclipse.persistence.jpa.rs.resources.common.AbstractEntityResource.find(AbstractEntityResource.java:92)
    at org.eclipse.persistence.jpa.rs.resources.unversioned.EntityResource.find(EntityResource.java:52)

似乎EclipseLink JAXB实现（MOXy）无法处理该类。我的理解是，在JPA中，只有实体类才需要是顶级类。属性允许使用静态嵌套类。

奇怪的是，这个类适用于普通的EclipseLink。这是否意味着JPA-RS有自己的处理JPA类的方法？是否可以将其与示例类进行协调？

我正在使用EclipseLink 2.4.2（以及Jersey 1.18.2作为JAX-RS实现，如果这很重要）

EclipseLink JPA-RS中的静态嵌套类

0 个答案: