Mapping a List property: unknown target entity property

Jux · **Joined:** Wed May 09, 2007 10:36 am **Posts:** 4

Hibernate version: 3.2.2.ga

Full stack trace of any exception that occurs:

Code:

Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'hibernateSessionFactory' defined in class path resource [DAOConfig.xml]: Invocation of init method failed; nested exception is org.hibernate.AnnotationException: mappedBy reference an unknown target entity property: *.data.classifier.BaseMessageCategory.owner in *.data.BaseMessage.categories
   at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory
.initializeBean(AbstractAutowireCapableBeanFactory.java:1088)
   at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory
.createBean(AbstractAutowireCapableBeanFactory.java:429)
   at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:250)
   at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry
.getSingleton(DefaultSingletonBeanRegistry.java:141)
   at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:247)
   at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:161)
   at org.springframework.beans.factory.support.DefaultListableBeanFactory
.preInstantiateSingletons(DefaultListableBeanFactory.java:270)
   at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:346)
   at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:92)
   at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:77)
   at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
   at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:67)
   at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
   at java.lang.reflect.Constructor.newInstance(Constructor.java:521)
   at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:84)
   ... 164 more
Caused by: org.hibernate.AnnotationException: mappedBy reference an unknown target entity property: *.data.classifier.BaseMessageCategory.owner in *.data.BaseMessage.categories
   at org.hibernate.cfg.annotations.CollectionBinder.bindStarToManySecondPass(CollectionBinder.java:543)
   at org.hibernate.cfg.annotations.CollectionBinder$1.secondPass(CollectionBinder.java:508)
   at org.hibernate.cfg.CollectionSecondPass.doSecondPass(CollectionSecondPass.java:43)
   at org.hibernate.cfg.Configuration.secondPassCompile(Configuration.java:1130)
   at org.hibernate.cfg.AnnotationConfiguration.secondPassCompile(AnnotationConfiguration.java:296)
   at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1286)
   at org.springframework.orm.hibernate3.LocalSessionFactoryBean.newSessionFactory(LocalSessionFactoryBean.java:804)
   at org.springframework.orm.hibernate3.LocalSessionFactoryBean.buildSessionFactory(LocalSessionFactoryBean.java:744)
   at org.springframework.orm.hibernate3.AbstractSessionFactoryBean.afterPropertiesSet(AbstractSessionFactoryBean.java:131)
   at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory
.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1118)
   at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory
.initializeBean(AbstractAutowireCapableBeanFactory.java:1085)
   ... 178 more

Name and version of the database you are using: Oracle 10g

Hello
-------

I have problem with mapping a List property in my entity bean.

I get exception:

Code:

org.hibernate.AnnotationException: mappedBy reference an unknown target entity property: mypackage1.BaseMessageCategory.owner in mypackage2.BaseMessage.categories
   at org.hibernate.cfg.annotations.CollectionBinder.bindStarToManySecondPass(CollectionBinder.java:543)
   at org.hibernate.cfg.annotations.CollectionBinder$1.secondPass(CollectionBinder.java:508)
   at org.hibernate.cfg.CollectionSecondPass.doSecondPass(CollectionSecondPass.java:43)
   at org.hibernate.cfg.Configuration.secondPassCompile(Configuration.java:1130)
   ...

Here is the code of java classes:

Code:

///////// One-To-Many side ////////////////
/* BaseMessage Class */
@Entity
@Table(name = "BASEMESSAGE")
@Inheritance(strategy = InheritanceType.JOINED)
@PrimaryKeyJoinColumn(name = "BASEMESSAGE_ID", referencedColumnName = "BASEOBJECT_ID")
public class BaseMessage extends BaseObject {
   
   /** List of content category classificators - the list I want to map!*/
   @OneToMany(cascade = CascadeType.ALL, mappedBy = SirClassifier.OWNER_ATTR,
         targetEntity = BaseMessageCategory.class)
   private List<BaseMessageCategory> categories;
   
   //... setters getters and other not important stuff ...
}

/* BaseObject class */
@Entity
@Table(name = "BASEOBJECT")
@Inheritance(strategy = InheritanceType.JOINED)
@PrimaryKeyJoinColumn(name = "BASEOBJECT_ID", referencedColumnName = "ID")
public abstract class BaseObject extends ClassifierOwner {
   // ... not important stuff ...
}

/* ClassifierOwner class */
@Entity
@Table(name = "CLASSIFIEROWNER")
@Inheritance(strategy = InheritanceType.JOINED)
@SequenceGenerator(name = "ID_SEQ", sequenceName = "ID_SEQ")
public abstract class ClassifierOwner implements Serializable {
   private static final long serialVersionUID = 1L;   
   
   @Id
   @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "ID_SEQ")
   private Long id;
   
   // ... setters getters and other not important stuff ... 
}

///////// Many-To-One side ////////////////
/* BaseMessageCategory class */
@Entity
@DiscriminatorValue(BaseMessageCategory.DISCR)
@Where(clause = SirClassifier.DISCR_FIELD + "='" + BaseMessageCategory.DISCR + "'")
public class BaseMessageCategory extends SirClassifier {

   public static final String DISCR = "BaseMessageCategory";

   public BaseMessageCategory() {
      super();
   }

   public BaseMessageCategory(String code) {
      super(code, ClassifierName.ContentCategory);
   }
}

/* SirClassifier class */
@Entity
@Table(name = "CLASSIFIER")
@Inheritance(strategy=InheritanceType.SINGLE_TABLE)
@DiscriminatorColumn(name=SirClassifier.DISCR_FIELD, discriminatorType=DiscriminatorType.STRING, length=40)
@SequenceGenerator(name="ID_SEQ", sequenceName="ID_SEQ")
public abstract class SirClassifier implements Serializable {

   private static final long serialVersionUID = 1L;
   public static final String OWNER_ATTR = "owner";
   public static final String DISCR_FIELD = "DISCR";

   @Id
   @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "ID_SEQ")
   private Long id;
   
   @ManyToOne(targetEntity = ClassifierOwner.class)
   @JoinColumn(name = "OWNERID")
   private ClassifierOwner owner;

   @Column
   @Enumerated(EnumType.STRING)
   private ClassifierName className;

   @Column
   private String code;
   
   // ...
}

So basicly there are two types of inheritence here:
1. The one-to-many side, BaseMessage uses InheritanceType.JOINED, meaning every class has its own database table.
2. The many-to-one side, BaseMessageCategory and other classes who extend the SirClassifier base class are useing InheritanceType.SINGLE_TABLE, so that all the child entitys (classifiers) are stored in one database table.

I also give short description about the database tables:

Code:

CLASSIFIEROWNER(ID)
BASEOBJECT(BASEOBJECT_ID)
BASEMESSAGE(BASEMESSAGE_ID)
CLASSIFIER(ID, DISCR, OWNERID, CODE, CLASSNAME)

I would be very thankfull if somebody could look through my BaseMessage class and BaseMessageCategory class, the part where I have annotated the many-to-one relationship. In my opinion I have done everything by the book, but the cryptic hibernate exception really does not help me.

Jux.

cbredesen · **Posted:** Thu May 10, 2007 5:01 pm

I think what's happened is you've not mapped your base classes as @MappedSuperclass. JPA will ignore those properties if you don't specify those classes as such:

http://java.sun.com/javaee/5/docs/api/j ... class.html

I will admit I did not test this but you do have subclasses and I don't see this annotation anywhere :)

-Chris

benoit.heinrich · **Joined:** Mon Nov 26, 2007 12:49 pm **Posts:** 7

Chris,

I've more or less the same problem: using inheritance and OneToMany associations mapped on an inherited property.

I tried to put the @MappedSuperclass annotation to the base class but then when I tried to run the test suite of my Ejbs I got the following error:

Code:

java.lang.AssertionError
        at org.hibernate.cfg.AnnotationBinder.getElementsToProcess(AnnotationBinder.java:795)
        at org.hibernate.cfg.AnnotationBinder.bindClass(AnnotationBinder.java:645)
        at org.hibernate.cfg.AnnotationConfiguration.processArtifactsOfType(AnnotationConfiguration.java:498)
        at org.hibernate.cfg.AnnotationConfiguration.secondPassCompile(AnnotationConfiguration.java:277)
        at org.hibernate.cfg.Configuration.buildMappings(Configuration.java:1115)
        at org.hibernate.ejb.Ejb3Configuration.buildMappings(Ejb3Configuration.java:1269)
        at org.hibernate.ejb.EventListenerConfigurator.configure(EventListenerConfigurator.java:150)
        at org.hibernate.ejb.Ejb3Configuration.configure(Ejb3Configuration.java:888)
        at org.hibernate.ejb.Ejb3Configuration.configure(Ejb3Configuration.java:416)
        at org.hibernate.ejb.HibernatePersistence.createContainerEntityManagerFactory(HibernatePersistence.java:126)
...

So I tried to remove the @Entity of the base class but then It does not load my @NamedQueries anymore.

So how to deal with generic named queries + inheritance + OneToMany associations?

Code:

@Entity  // ? does not work with MappedSuperclass
@NamedQueries( {
    @NamedQuery(name = "getBadStatus", query = "from Base b where b.status < 1 ORDER BY status")
 })
@Inheritance(strategy = InheritanceType.TABLE_PER_CLASS)
@MappedSuperclass
public abstract class Base implements java.io.Serializable {
   private long id;
   private Base parent;
   private short status;
  
   @Id
   @Column(name = "`ID`", unique = true, nullable = false, insertable = true, updatable = true)
   @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "base_id_seq_generator")
   @SequenceGenerator(name = "base_id_seq_generator", sequenceName = "base_id_seq", allocationSize = 1)
   public long getId() {
      return this.id;
   }

   public void setId(long id) {
      this.id = id;
   }
  
   @ManyToOne(cascade = {}, fetch = FetchType.LAZY)
   @JoinColumn(name = "`ParentID`", unique = false, nullable = true, insertable = true, updatable = true)
   public Base getParent() {
      return this.parent;
   }

   public void setParent(Base parent) {
      this.parent = parent;
   }

   public short getStatus() {
      return this.status;
   }

   /**
    * @param sendStatus
    */
   public void setSendStatus(short status) {
      this.status = status;
   }
}

/Benoit