[hibernate-issues] [Hibernate-JIRA] Commented: (ANN-141) Add annotation support for UserCollectionType

[tao wen (JIRA)]

    [ http://opensource.atlassian.com/projects/hibernate/browse/ANN-141?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=31902#action_31902 ] 

tao wen commented on ANN-141:
-----------------------------

I think I have found a solution without changing the hibernate code. Currently, to let the AnnotationConfiguration be able to handle UserCollectionType, there are to two issues. First, Ejb3ReflectionManager think the member is not a collection, so you will first get a "Illegal attempt to map a non collection as a @OneToMany, @ManyToMany or @CollectionOfElements" exception. This could be work around by change the reflection manager in AnnotationManager. Second issue is the typeName(which is the class name of your UserCollectionType class) property of Set mapping is null (of coz it is null, because there is no place to set it), so hibernate will use default SetType to handle it, which will cause runtime "setter unknown" exception. This could be workaround by post-process the configuration produced by AnnotationConfiguration.configure(), set the typeName for all the set mapping you think need to use your UserCollectionType.
Finally, it is a hack, not a solution.

> Add annotation support for UserCollectionType
> ---------------------------------------------
>
>                 Key: ANN-141
>                 URL: http://opensource.atlassian.com/projects/hibernate/browse/ANN-141
>             Project: Hibernate Annotations
>          Issue Type: Patch
>          Components: binder
>    Affects Versions: 3.1beta6
>         Environment: All versions, database agnostic
>            Reporter: Douglas Sjoquist
>            Priority: Minor
>         Attachments: UserCollectionTypeAnnotation.zip
>
>   Original Estimate: 30 minutes
>  Remaining Estimate: 30 minutes
>
> Add an annotation to specify the UserCollectionType for a OneToMany or ManyToMany.
> The annotation is named CollectionTypeInfo, perhaps better named UserCollectionType, but I didn't know the standards for naming classes.
> The change to AnnotationBinder is minor and is delineated by '//dwsjoquist//'  comment lines.
> Usage:
>     @OneToMany(fetch = FetchType.LAZY, cascade = CascadeType.ALL)
>     @JoinColumn(name = "id")
>     @CollectionTypeInfo(name = "examples.MyUserCollectionType")
>     public List<ExampleAttribute> getExampleAttributes() {

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