Re: JDO Collections

[Gus Heck]

Mahler Thomas wrote:

Hi Gus,

The current JDO implementation does not inherit the ODMG stuff.
You should use simple java.util.Collection attributes for your collections.
You'll have to define collection-descriptors with
auto-retrieve="true", auto-update="false" and auto-delete="false".
cheers,
Thomas
 

Tried this but I am having issues....

I have an person object that holds a collection of ContactInfo. People 
may be contacted at more than one place... etc. The contact info objects 
are perfectly happy not knowing who they contact (they have no reference 
to Person). This is an 1:n mapping, but the n contacts have no 
dependancy on the 1 person. The xdoclet module seems to require that the 
ContactInfo's all know about the Person's. This seems like a silly 
requirement.

    From the ojbdoclet documentation:

foreignkey

Contains one or more foreign key field or columns (separated by commas).

If the collection implements an 1:n association, then this attribute 
specifies the fields in the element type that implement the association 
on the element side. Note that these fields are required to have the 
ojb.field

From my class

   /**
    * @ojb.field
    * @ojb.collection auto-retrieve="true"
    *                 auto-update="false"
    *                 auto-delete="false"
    */
   Collection ContactsCollection;
   The error:

   Generating repository_user.xml.
   (XDocletMain.start                   53  ) Running XDoclet failed.
   (XDocletMain.start                   54  ) <<No foreign keys
   specified for collection ContactsCollection in type
   org.cs101.fdb.impl.jdo.PersonBase.>>
   build.xml [323] XDoclet failed.
           at xdoclet.DocletTask.start(DocletTask.java:461)
           at xjavadoc.ant.XJavadocTask.execute(XJavadocTask.java:95)
           at
   org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:166)
           at org.apache.tools.ant.Task.perform(Task.java:319)
           at org.apache.tools.ant.Target.execute(Target.java:309)
   (the trace is about 30 miles long... I'll post it if it helps).
How do I get around this? or am I forced to put in useless, backreference?

-Gus

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