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From "Pinaki Poddar (JIRA)" <j...@apache.org>
Subject [jira] Resolved: (OPENJPA-286) Can't merge detached One-To-Many child instance. The entities were implement by an internal Hash container.
Date Wed, 16 Jul 2008 04:51:31 GMT

     [ https://issues.apache.org/jira/browse/OPENJPA-286?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Pinaki Poddar resolved OPENJPA-286.
-----------------------------------

    Resolution: Fixed

This style of modeling persistent states as a name-value pair does not notify OpenJPA which
field has been dirtied and hence the observed behavior.
Inform OpenJPA when a field has been dirtied and things should work.
The added lines in TestMargeHashEntity (around Line 79) are marked with + and additional comments
 
		em = emf.createEntityManager();
		em.getTransaction().begin();
+		parent = em.merge(parent);                                                  // merge the
detached entity to the current context
+		OpenJPAPersistence.cast(em).dirty(parent, "children"); // mark it dirty because OpenJPA
did not understand that the name-value pair has been updated
                                                                                         
                          // now proceed as usual by merging it again so that it can detect
the new child added in detached state 
		parent = em.merge(parent);
		em.getTransaction().commit();
		em.close();


> Can't merge detached One-To-Many child instance. The entities were implement by an internal
Hash container.
> -----------------------------------------------------------------------------------------------------------
>
>                 Key: OPENJPA-286
>                 URL: https://issues.apache.org/jira/browse/OPENJPA-286
>             Project: OpenJPA
>          Issue Type: Bug
>          Components: jdbc
>    Affects Versions: 0.9.7, 1.0.0, 1.1.0
>         Environment: java version "1.5.0_10"
> Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_10-b03)
> Java HotSpot(TM) Client VM (build 1.5.0_10-b03, mixed mode, sharing)
>            Reporter: Gene Wu
>            Assignee: Pinaki Poddar
>         Attachments: hashpojo.zip
>
>
> Maybe you know, one of the entity implementation is composite of a hash set, which stores
key-value pairs.
> It's a common design of Entity Bean in EJB2.x ages. Does any one use it in OpenJPA? I
am using it right now, and encounter an issue in entity cascade manipulate. Here is the issue
description.
> Base.java : the super class of entities.
>         protected final Object getAttributeValue(String attributeName) {
>                 return _values.get(attributeName);
>         }
>         protected final void setAttributeValue(String attributeName, Object value) {
>                 _values.put(attributeName, value);
>         }
>         // To hold the {attributeName, value} pair of the value object.
>         private HashMap<String, Object> _values = new HashMap<String, Object>();
> C.java extends Base.java : Entity C has a set of Entity D.
>         public void setDs(Set<D> ds) {
>                 setCollection("Ds", ds);
>         }
>         @OneToMany(mappedBy = "c", fetch = FetchType.LAZY, cascade = CascadeType.ALL)
>         public Set<D> getDs() {
>                 return (Set<D>)getAttributeValue("Ds");
>         }
> D.java extends Base.java as well.
> The relationship between C and D is one-to-many. I use following code to reproduce the
issue.
>                 C c = em.find(C.class, 1);
>                 logger.debug(c.getDs().size());
>                 D d = new D();
>                 d.setC(c);
>                 c.getDs().add(d);
>                 em.merge(c);
> After commit the transaction, you will find the new D instance was not inserted into
the database(there is no insert sql log as well). After you add, em.persist(c). That new instance
will be added!
> Meanwhile, I wrote a couple of classes, which do not use a HashSet. I got the expected
result after merge is done. 

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