的Hibernate对象

现有数据库的4映射合成包含下表的Hibernate对象

CREATE TABLE `memberships` (
    `group_id` int(11) NOT NULL default '0', 
    `user_id` int(11) NOT NULL default '0', 
    `status` int(11) default NULL, 
    PRIMARY KEY (`group_id`,`user_id`) 
)

映射到基本ID /名组和用户表

如何映射上休眠？

public class Memberships { 
    private User user; 
    private Group group; 
    private Integer status; 

    ... getters/setters 

}

我想确实有类似上述

我一直在试图与@IdClass和@Embeddable，但没有成功

有什么想法？

的Java 8，休眠4次

更新：工人阶级的映射

@Entity 
@Table(name = "memberships") 
@Getter 
@Setter 
@EqualsAndHashCode 
@ToString 
@Accessors(chain = true) 
@IdClass(Memberships.MembershipsPK.class) 
public class Memberships implements Serializable { 

    @Id 
    @ManyToOne 
    @JoinColumn(name = "user_id") 
    private User user; 

    @Id 
    @ManyToOne 
    @JoinColumn(name = "group_id") 
    private Group group; 

    @Column(name = "status") 
    private Integer status; 

    @Getter 
    @Setter 
    @EqualsAndHashCode 
    @ToString 
    public static class MembershipsPK implements Serializable { 

     @Id 
     @Column(name = "user_id") 
     private long user; 

     @Id 
     @Column(name = "group_id") 
     private long group; 


    } 

}

我使用的龙目岛项目的getter &二传手

JPA库：

public interface MembershipsRepository extends JpaRepository<Memberships, Memberships.MembershipsPK>, RevisionRepository<Memberships, Memberships.MembershipsPK, Integer> { 
} 

User user = userBo.findOne(1l); 
     Group group = new Group().setApplication(application).setName("teste"); 
     groupService.save(group); 

     Memberships memberships = new Memberships().setGroup(group).setUser(user).setStatus(1); 

     membershipsService.save(memberships);

EXCEPTION：

Exception in thread "main" org.springframework.orm.jpa.JpaSystemException: could not set a field value by reflection setter of com.lotjm.domain.Memberships$MembershipsPK.user; nested exception is org.hibernate.PropertyAccessException: could not set a field value by reflection setter of com.lotjm.domain.Memberships$MembershipsPK.user 
    at org.springframework.orm.jpa.vendor.HibernateJpaDialect.convertHibernateAccessException(HibernateJpaDialect.java:314) 
    at org.springframework.orm.jpa.vendor.HibernateJpaDialect.translateExceptionIfPossible(HibernateJpaDialect.java:225) 
    at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.translateExceptionIfPossible(AbstractEntityManagerFactoryBean.java:436) 
    at org.springframework.dao.support.ChainedPersistenceExceptionTranslator.translateExceptionIfPossible(ChainedPersistenceExceptionTranslator.java:59) 
    at org.springframework.dao.support.DataAccessUtils.translateIfNecessary(DataAccessUtils.java:213) 
    at org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:147) 
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) 
    at org.springframework.data.jpa.repository.support.CrudMethodMetadataPostProcessor$CrudMethodMetadataPopulatingMethodInterceptor.invoke(CrudMethodMetadataPostProcessor.java:133) 
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) 
    at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:92) 
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) 
    at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:208) 
    at com.sun.proxy.$Proxy78.save(Unknown Source) 
    at com.lotjm.service.impl.GenericRepositoryServiceImpl.save(GenericRepositoryServiceImpl.java:32) 
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) 
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) 
    at java.lang.reflect.Method.invoke(Method.java:497) 
    at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:302) 
    at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:190) 
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157) 
    at org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:99) 
    at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:281) 
    at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:96) 
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) 
    at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:208) 
    at com.sun.proxy.$Proxy79.save(Unknown Source) 
    at com.lotjm.util.HibernateReadingTesting.main(HibernateReadingTesting.java:51) 
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) 
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) 
    at java.lang.reflect.Method.invoke(Method.java:497) 
    at com.intellij.rt.execution.application.AppMain.main(AppMain.java:144) 
Caused by: org.hibernate.PropertyAccessException: could not set a field value by reflection setter of com.lotjm.domain.Memberships$MembershipsPK.user 
    at org.hibernate.property.DirectPropertyAccessor$DirectSetter.set(DirectPropertyAccessor.java:134) 
    at org.hibernate.tuple.component.AbstractComponentTuplizer.setPropertyValues(AbstractComponentTuplizer.java:93) 
    at org.hibernate.tuple.component.PojoComponentTuplizer.setPropertyValues(PojoComponentTuplizer.java:116) 
    at org.hibernate.type.ComponentType.setPropertyValues(ComponentType.java:439) 
    at org.hibernate.tuple.entity.AbstractEntityTuplizer$NormalMappedIdentifierValueMarshaller.getIdentifier(AbstractEntityTuplizer.java:437) 
    at org.hibernate.tuple.entity.AbstractEntityTuplizer.getIdentifier(AbstractEntityTuplizer.java:342) 
    at org.hibernate.persister.entity.AbstractEntityPersister.getIdentifier(AbstractEntityPersister.java:4746) 
    at org.hibernate.event.internal.DefaultMergeEventListener.onMerge(DefaultMergeEventListener.java:164) 
    at org.hibernate.event.internal.DefaultMergeEventListener.onMerge(DefaultMergeEventListener.java:85) 
    at org.hibernate.internal.SessionImpl.fireMerge(SessionImpl.java:876) 
    at org.hibernate.internal.SessionImpl.merge(SessionImpl.java:858) 
    at org.hibernate.internal.SessionImpl.merge(SessionImpl.java:863) 
    at org.hibernate.jpa.spi.AbstractEntityManagerImpl.merge(AbstractEntityManagerImpl.java:1196) 
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) 
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) 
    at java.lang.reflect.Method.invoke(Method.java:497) 
    at org.springframework.orm.jpa.SharedEntityManagerCreator$SharedEntityManagerInvocationHandler.invoke(SharedEntityManagerCreator.java:294) 
    at com.sun.proxy.$Proxy62.merge(Unknown Source) 
    at org.springframework.data.jpa.repository.support.SimpleJpaRepository.save(SimpleJpaRepository.java:508) 
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) 
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) 
    at java.lang.reflect.Method.invoke(Method.java:497) 
    at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.executeMethodOn(RepositoryFactorySupport.java:503) 
    at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.doInvoke(RepositoryFactorySupport.java:488) 
    at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.invoke(RepositoryFactorySupport.java:460) 
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) 
    at org.springframework.data.projection.DefaultMethodInvokingMethodInterceptor.invoke(DefaultMethodInvokingMethodInterceptor.java:61) 
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) 
    at org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:99) 
    at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:281) 
    at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:96) 
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) 
    at org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:136) 
    ... 27 more 
Caused by: java.lang.IllegalArgumentException: Can not set long field com.lotjm.domain.Memberships$MembershipsPK.user to com.lotjm.domain.User 
    at sun.reflect.UnsafeFieldAccessorImpl.throwSetIllegalArgumentException(UnsafeFieldAccessorImpl.java:167) 
    at sun.reflect.UnsafeFieldAccessorImpl.throwSetIllegalArgumentException(UnsafeFieldAccessorImpl.java:171) 
    at sun.reflect.UnsafeLongFieldAccessorImpl.set(UnsafeLongFieldAccessorImpl.java:102) 
    at java.lang.reflect.Field.set(Field.java:764) 
    at org.hibernate.property.DirectPropertyAccessor$DirectSetter.set(DirectPropertyAccessor.java:122) 
    ... 61 more

替代解决方案：

@Entity 
@Table(name = "memberships") 
@Getter 
@Setter 
@EqualsAndHashCode 
@ToString 
@Accessors(chain = true) 
public class Memberships implements Serializable { 

    @EmbeddedId 
    @JoinColumns({ 
    @JoinColumn(name = "user_id", referencedColumnName = "user_id"), 
    @JoinColumn(name = "group_id", referencedColumnName = "group_id") 
    }) 
    private MembershipsPK id = new MembershipsPK(); 

    public Memberships setGroup(Group group) { 
     id.setGroup(group); 
     return this; 
    } 

    public Memberships setUser(User user) { 
     id.setUser(user); 
     return this; 
    } 


    @Column(name = "status") 
    private Integer status; 

    @Embeddable 
    @Getter 
    @Setter 
    @EqualsAndHashCode 
    public static class MembershipsPK implements Serializable { 
     @ManyToOne(targetEntity = User.class) 
     @JoinColumn(name = "user_id") 
     private User user; 

     @ManyToOne(targetEntity = Group.class) 
     @JoinColumn(name = "group_id") 
     private Group group; 
    } 

}

来源

2016-05-31 Eduardo Rodrigues

@Entity 
@Table(name = "memberships") 
public class Memberships implements Serializable { 

    @Id 
    @ManyToOne 
    @JoinColumn(name = "user_id") 
    private User user; 

    @Id 
    @ManyToOne 
    @JoinColumn(name = "group_id") 
    private Group group; 

    @Column(name = "status") 
    private Integer status; 

}

这种映射生成此SQL的数据库H2（我用Long为IDS）

create table memberships (
     status integer, 
     user_id bigint not null, 
     group_id bigint not null, 
     primary key (user_id, group_id) 
)

更新

要解决此问题：

org.hibernate.PropertyAccessException: could not set a field value by reflection setter of com.lotjm.domain.Memberships$MembershipsPK.user

刚刚从MembershipsPK领域去除@Id和@Column注解。

@Getter 
@Setter 
@EqualsAndHashCode 
@ToString 
public static class MembershipsPK implements Serializable { 

    private long user; 

    private long group; 

}

来源

2016-05-31 09:37:56

如何创建没有1个主键的JpaRepository？ –

@EduardoRodrigues对不起，我没有得到你所问的。 –

我的意思是我怎么创建（如果可能的话）一个'MembershipRepository'类，它实现了'public interface JpaRepository '，因为没有一个ID可以用作主键 –

的Hibernate对象

回答

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