使用 JPA（休眠）从 MongoDB 加载对象

Question

我创建了一个 @Entity 并使用 Java Peristence API (JPA) 通过 Hibernate 将其存储在 MongoDB 中，以便能够切换到另一个 JPA 实现（如 DataNucleus、EclipseLink 等），但现在我无法再加载它了。我得到：

java.lang.NoSuchMethodError: org.hibernate.engine.internal.TwoPhaseLoad.addUninitializedEntity(Lorg/hibernate/engine/spi/EntityKey;Ljava/lang/Object;Lorg/hibernate/persister/entity/EntityPersister;Lorg/hibernate/LockMode;ZLorg/hibernate/engine/spi/SessionImplementor;)V
    at org.hibernate.ogm.loader.impl.OgmLoader.loadFromResultSet(OgmLoader.java:1143)
    at org.hibernate.ogm.loader.impl.OgmLoader.instanceNotYetLoaded(OgmLoader.java:1065)
    at org.hibernate.ogm.loader.impl.OgmLoader.getRow(OgmLoader.java:959)
    at org.hibernate.ogm.loader.impl.OgmLoader.getRowFromResultSet(OgmLoader.java:498)
    at org.hibernate.ogm.loader.impl.OgmLoader.doQuery(OgmLoader.java:373)
    at org.hibernate.ogm.loader.impl.OgmLoader.doQueryAndInitializeNonLazyCollections(OgmLoader.java:283)
    at org.hibernate.ogm.loader.impl.OgmLoader.loadEntity(OgmLoader.java:201)
    at org.hibernate.ogm.loader.impl.OgmLoader.load(OgmLoader.java:157)
    at org.hibernate.ogm.loader.impl.OgmLoader.load(OgmLoader.java:149)
    at org.hibernate.ogm.loader.entity.impl.DynamicBatchingEntityLoaderBuilder$DynamicBatchingEntityLoader.load(DynamicBatchingEntityLoaderBuilder.java:116)
    at org.hibernate.persister.entity.AbstractEntityPersister.load(AbstractEntityPersister.java:4002)
    at org.hibernate.event.internal.DefaultLoadEventListener.loadFromDatasource(DefaultLoadEventListener.java:508)
    at org.hibernate.event.internal.DefaultLoadEventListener.doLoad(DefaultLoadEventListener.java:478)
    at org.hibernate.event.internal.DefaultLoadEventListener.load(DefaultLoadEventListener.java:219)
    at org.hibernate.event.internal.DefaultLoadEventListener.proxyOrLoad(DefaultLoadEventListener.java:278)
    at org.hibernate.event.internal.DefaultLoadEventListener.doOnLoad(DefaultLoadEventListener.java:121)
    at org.hibernate.event.internal.DefaultLoadEventListener.onLoad(DefaultLoadEventListener.java:89)
    at org.hibernate.internal.SessionImpl.fireLoad(SessionImpl.java:1142)
    at org.hibernate.internal.SessionImpl.access00(SessionImpl.java:167)
    at org.hibernate.internal.SessionImpl$IdentifierLoadAccessImpl.doLoad(SessionImpl.java:2762)
    at org.hibernate.internal.SessionImpl$IdentifierLoadAccessImpl.load(SessionImpl.java:2741)
    at org.hibernate.internal.SessionImpl.get(SessionImpl.java:978)
    at org.hibernate.engine.spi.SessionDelegatorBaseImpl.get(SessionDelegatorBaseImpl.java:629)
    at org.hibernate.jpa.spi.AbstractEntityManagerImpl.find(AbstractEntityManagerImpl.java:1075)
    at org.hibernate.jpa.spi.AbstractEntityManagerImpl.find(AbstractEntityManagerImpl.java:1033)
    at org.hibernate.ogm.jpa.impl.OgmEntityManager.find(OgmEntityManager.java:97)

所有类都与此类似或使用它的子集：

// package and imports (lombok and jpa)

@Entity
@Inheritance(strategy = InheritanceType.TABLE_PER_CLASS)
public class Bla {

    @Id
    @GeneratedValue(strategy = GenerationType.TABLE)
    @Getter
    @Setter
    private long id;

    @Getter
    @Setter
    private <T extends Object> attribute;

    @OneToMany
    @Getter
    @Setter
    private List<<T extends Object>> list;

    @ElementCollection
    @JoinTable(name="TASKS", joinColumns=@JoinColumn(name="user"))
    @Getter
    @Setter
    private Map<<T extends Object>, Boolean> doneTask;

}

我正在使用 entityManager.find(Class<T> type, Object o) 加载对象。我可能做错了什么吗？

Answer 1

要使用 MongoDB，您需要

runtime "org.mongodb:mongo-java-driver:$versions.mongodb"

和您的 ogm/persitence 框架，在我的例子中是 Hibernate，与您的 framework/db 连接：

compile "org.hibernate.ogm:hibernate-ogm-core:$hibernate_version"
compile "org.hibernate:hibernate-entitymanager:$hibernate_version"
runtime "org.hibernate.ogm:hibernate-ogm-mongodb:$hibernate_version"

和您的坚持 api（jpa、jdo 或专有的），在我的例子中是 JPA hibernate/jpa 实现：

compile "org.hibernate.javax.persistence:hibernate-jpa-2.1-api:1.0.0.Final"
compile "$versions.persistence_api"

使用 JPA（休眠）从 MongoDB 加载对象

Load Object from MongoDB with JPA (hibernate)

java

hibernate

jpa

object-persistence

mongodb