Re: [eclipselink-users] Toplink bidirectional OneToMany

[James Sutherland <jamesssss@xxxxxxxxx>]

What is your code for the two classes in error?  You most like have a
OneToMany back instead of ManyToOne.  Check that your code is correct and
compiled/deployed correctly.

The code in TopLink Essentials is fine, isOneToOneMapping() in the model is
true for ManyToOne as well as OneToOne.



Stevo Slavic wrote:
> 
> Hello eclipselink users,
> 
> First of all, is it ok to ask toplink questions on this mailing list?
> 
> Assuming it is, here is my case.
> In a project using (legacy) technologies like jpa 1.0, glassfish 2.1.1
> (with provided toplink 2.1-b31g-fcs) I'm getting infamous
> TOPLINK-7244,
> 
> "An incompatible mapping has been encountered between [class X] and
> [class Y]. This usually occurs when the cardinality of a mapping does
> not correspond with the cardinality of its backpointer."
> 
> In this (see
> http://download.oracle.com/docs/cd/B10464_05/web.904/b10313/mapping.htm#1108697
> ) toplink guide paragraph there is following statement:
> 
> "Use one-to-many mappings for relationships between entity beans or
> between an entity bean and a collection of privately owned regular
> Java objects. When you create one-to-many mappings, also create a
> one-to-one mapping from the target objects back to the source."
> 
> In
> oracle.toplink.essentials.internal.ejb.cmp3.metadata.accessors.OneToManyAccessor.process()
> method when mappedBy is specified so that many part is owner of the
> relationship, toplink enforces that owning many side instead of having
> @ManyToOne has @OneToOne annotation
> 
> {code}
>             // Create a 1-M mapping and process common collection mapping
>             // metadata.
>             OneToManyMapping mapping = new OneToManyMapping();
>             process(mapping);
> 
>             // Non-owning side, process the foreign keys from the owner.
> 			OneToOneMapping ownerMapping = null;
>             if (getOwningMapping().isOneToOneMapping()){
>             	ownerMapping = (OneToOneMapping) getOwningMapping();
>             } else {
> 				// If improper mapping encountered, throw an exception.
>             	getValidator().throwInvalidMappingEncountered(getJavaClass(),
> getReferenceClass());
>             }
> {code}
> 
> What's wrong with toplink, even @OneToMany jpa 1.0 javadoc lists
> following as first example:
> 
> 
>     Example 1: One-to-Many association using generics
> 
>     In Customer class:
> 
>     @OneToMany(cascade=ALL, mappedBy="customer")
>     public Set getOrders() { return orders; }
> 
>     In Order class:
> 
>     @ManyToOne
>     @JoinColumn(name="CUST_ID", nullable=false)
>     public Customer getCustomer() { return customer; }
> 
> 
> 
> What am I missing here?
> 
> Regards,
> Stevo.
> 
> 


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