[hibernate-issues] [Hibernate-JIRA] Commented: (HBX-964) add serialVersionUID to entity classes

[jahlborn (JIRA)]

    [ http://opensource.atlassian.com/projects/hibernate/browse/HBX-964?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=31506#action_31506 ] 

jahlborn commented on HBX-964:
------------------------------

@max: the very same argument could be made for the "magic" value computed by the jvm.  it is just a hash of a bunch of different stuff, and there is no guarantee that incompatible changes to the class will not result in the same serialVersionUID.

that said, why not just add an optional property to the hbm file so users can specify them directly (like <meta attribute="serialversionUID">), this is probably the correct solution as it allows users to decide when incompatible changes have been made.  that would put us in the very same spot we are already in when writing our own java files.  when we change the hbm file incompatibly, we should change the serialVersionUID.

> add serialVersionUID to entity classes
> --------------------------------------
>
>                 Key: HBX-964
>                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HBX-964
>             Project: Hibernate Tools
>          Issue Type: Improvement
>          Components: hbm2java
>    Affects Versions: 3.2beta10
>            Reporter: Dan Allen
>            Priority: Minor
>         Attachments: HBX-964-v1.txt
>
>   Original Estimate: 5 minutes
>  Remaining Estimate: 5 minutes
>
> The serialVersionUID is recommended for classes that implement java.io.Serializable.  The hbm2java task should either set the serialVersionUID to 1L or automatically generate a value. I prefer setting it to 1L because it is easy and it will work, but if you feel motivated, you can look at what Eclipse does to generate this value from the class signature.
> I have included a patch that just sets it to 1L.

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