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Unable to find entity with id ...

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lafr

Post subject: Unable to find entity with id ...

Posted: Mon Sep 24, 2007 3:24 pm

Newbie

Joined: Mon Sep 24, 2007 2:55 pm
Posts: 13

I'm using Hibernate version 3.2.4.SP1_CP01-brew within JBoss-4.2.2.GA (build from source).
The datamodel is given for many things by a legacy application.
Numeric foreign key fields are not empty (NULL) but filled with a 0 (zero) which cannot be changed.
Accessing this data gives exceptions like the following:

Code:

Caused by: javax.persistence.EntityNotFoundException: Unable to find biz.mbisoftware.fn.ejb.entity.MbiAdres with id [0]
        at org.hibernate.ejb.Ejb3Configuration$Ejb3EntityNotFoundDelegate.handleEntityNotFound(Ejb3Configuration.java:107)
        at org.hibernate.proxy.AbstractLazyInitializer.checkTargetState(AbstractLazyInitializer.java:79)
        at org.hibernate.proxy.AbstractLazyInitializer.initialize(AbstractLazyInitializer.java:68)
        at org.hibernate.proxy.AbstractLazyInitializer.getImplementation(AbstractLazyInitializer.java:111)
        at org.hibernate.proxy.pojo.javassist.JavassistLazyInitializer.invoke(JavassistLazyInitializer.java:166)
        at biz.mbisoftware.fn.ejb.entity.MbiAdres_$$_javassist_1997.getAdressNr(MbiAdres_$$_javassist_1997.java)

The relation field in MbiAdres (uni-directional):

Code:

   /** Relation with MbiAdres. */
   @ManyToOne(fetch=FetchType.LAZY)
   @JoinColumns({
      @JoinColumn(name="d_adress_nr",referencedColumnName="adress_nr")
   })
   private MbiAdres mbiAdresDAdressNr;

Is there a way to configure hibernate to ignore the EntityNotFound and simply set the field to null?
Or better, a way to advise Hibernate to treat a zero within a FK field like NULL as this is not a legal FK/PK value?

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hibernate

Post subject: Re: Unable to find entity with id ...

Posted: Fri Jan 03, 2014 5:15 am

Newbie

Joined: Thu May 20, 2004 4:51 am
Posts: 4

Code:

@NotFound(action=NotFoundAction.IGNORE)

When this annotation is added to a LAZY fetched @ManyToOne, Hibernate will issue two SQL queries: one for the main object, and one for the @ManyToOne. So you loose the LAZY behavior, see http://opensource.atlassian.com/projects/hibernate/browse/HHH-2753

But you can have @ManyToOne with LAZY loading AND without throwing EntityNotFoundException with the following code:

Code:

public MyManyToOneEntity getMyManyToOneEntityOrNull() {
  try {
    // force fetching the entity (will raise an EntityNotFoundException if not found)
    getMyManyToOneEntity().toString(); // or whatever method which force a fetch
 
    return getMyManyToOneEntity();
  } catch (EntityNotFoundException e) {
    return null;
  }
}

This way, Hibernate will issue one query for the main object, and one other query for the MyManyToOneEntity but only when the getMyManyToOneEntityOrNull() method is called

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