我是使用Maven和JBOSS处理JPA的初学者,通过Restful使我的应用程序出现以下问题,我在进行DEPLOY
Caused by: javax.persistence.PersistenceException: [PersistenceUnit: com.company.test_resources_war_1.0-SNAPSHOTPU] Unable to build EntityManagerFactory
Caused by: org.hibernate.MappingException: Repeated column in mapping for entity: database.Photo column: fid_module (should be mapped with insert = \ "false \" update = \ "false \") "}}
不是那一步,请检查所有posles解决方案,但是没有找到任何东西,有人可以帮助我吗?
提前致谢
在下面,我显示了我已经完成的映射以及postgres中的SQL代码。
我有三个表( Activity ,事件和照片),其中三个表(照片)引用了另外两个表( Activity 和事件列(即imgt_rstrong列)。 )
SQL代码(工程师数据库-> Postgresql):
CREATE TABLE activity (
id_activity integer not null,
name character varying(150),
description text,
CONSTRAINT id_activity_pk PRIMARY KEY (id_activity)
)
CREATE TABLE event (
id_event integer not null,
name character varying(150),
description text,
date timestamp without time zone,
CONSTRAINT id_event_pk PRIMARY KEY (id_event)
)
CREATE TABLE photo(
id_photo integer not null,
path character varying(150),
fid_module integer not null,
CONSTRAINT id_photo_pk PRIMARY KEY (id_photo),
CONSTRAINT fk_photo_activity FOREIGN KEY (fid_module)
REFERENCE activity (id_activity) MATCH SIMPLE
ON UPDATE NO ACTION ON DELETE NO ACTION,
CONSTRAINT fk_photo_event FOREIGN KEY (fid_module)
REFERENCE event (id_event) MATCH SIMPLE
ON UPDATE NO ACTION ON DELETE NO ACTION
)
现在,我在Netbenas的帮助下完成了映射,并提供了以下代码(我为三个表进行了映射,但在向我展示问题时是在 Photo.java 类中)。
@Entity
@Table(name = "photo")
@XmlRootElement
@NamedQueries({
@NamedQuery(name = "photo.findAll", query = "SELECT p FROM Photo p"),
@NamedQuery(name = "photo.findByFidPhoto", query = "SELECT p FROM Photo p WHERE p.fidphoto = :fidphoto"),
@NamedQuery(name = "photo.findByIdPhoto", query = "SELECT p FROM Photo p WHERE p.idphoto = :idphoto")})
public class Photo implements Serializable {
private static final long serialVersionUID = 1L;
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Basic(optional = false)
@Column(name = "id_photo")
private Integer idPhoto;
@Column(name = "path")
private Recurso fidPath;
@JoinColumn(name = "fid_module", referencedColumnName = "id_activity")
@ManyToOne(optional = false, fetch = FetchType.LAZY)
private SliderWebHome fidModule;
@JoinColumn(name = "fid_module", referencedColumnName = "id_event")
@ManyToOne(optional = false, fetch = FetchType.LAZY)
private Publicacion fidModule1;
public ModuloRecurso() {
}
.......
}
我正在使用JPA进行持久化(但是请执行mvn clean install和 mvn jboss-as:部署几个使我进入 hibernate 依赖关系)有人可以告诉我我的错误是什么,或者可以解决此问题。谢谢。
最佳答案
如另一个答案所述,您的Java代码为两个字段指定了相同的联接列名称,这是行不通的。
如果此Java代码是由netbeans映射工具生成的,如您的注释所示
错误的Java映射可能是由于SQL中约束的错误组合引起的。
您在photo
表的定义中具有:
CONSTRAINT fk_photo_activity FOREIGN KEY (fid_module)
REFERENCE activity (id_activity) MATCH SIMPLE
ON UPDATE NO ACTION ON DELETE NO ACTION,
CONSTRAINT fk_photo_event FOREIGN KEY (fid_module)
REFERENCE event (id_event) MATCH SIMPLE
ON UPDATE NO ACTION ON DELETE NO ACTION
试图使
fid_module
列成为引用activity
的外键以及引用event
的外键,这是行不通的。如果需要从
photo
到这两个表的外键,则需要使用两个不同的列。