[hibernate-issues] [Hibernate-JIRA] Created: (HHH-2586) Hibernate Serializable classes do not declare serialVersionUID

[Manuel Dominguez Sarmiento (JIRA)]

Hibernate Serializable classes do not declare serialVersionUID
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                 Key: HHH-2586
                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-2586
             Project: Hibernate3
          Issue Type: Bug
          Components: core
    Affects Versions: 3.2.3, 3.2.2, 3.2.1, 3.2.0.ga, 3.2.0.cr5, 3.2.0.cr4, 3.2.0.cr3, 3.2.0.cr2, 3.2.0 cr1, 3.1.3, 3.2.0.alpha2, 3.2.0.alpha1, 3.1.2, 3.1.1, 3.1, 3.1 rc3, 3.1 rc2, 3.1 rc 1, 3.1 beta 2, 3.1 beta 1, 3.0.5, 3.0.4, 3.0.3, 3.0.2, 3.0.1, 3.0 final, 3.0 rc 1, 3.0 beta 4, 3.0 beta 3, 3.0 beta 2, 3.0 beta 1, 3.0 alpha
         Environment: Not specific to any database, platform or Hibernate version.
            Reporter: Manuel Dominguez Sarmiento


None of the Serializable classes in Hibernate declare serialVersionUID (see http://www.hibernate.org/hib_docs/v3/api/serialized-form.html#org.hibernate.collection.AbstractPersistentCollection).

This is recommended practice for ALL classes that implement the Serializable interface (see Joshua Bloch's Effective Java - Item #54). Adding these fields is trivial and takes little effort, but is a great enhancement if you are serializing Hibernate classes.

For instance, we upgraded from Hibernate 3.2.2 to 3.2.3 in our production servers. We serialize process state (which sometimes includes references to Hibernate-managed entities) every 30 seconds or so and on shutdown, so in the event of failures or re-deployment, the processes can continue where they left off. We had a huge surprise when deserialization failed completely because AbstractPersistentCollection had slightly changed between the 3.2.2 and 3.2.3 releases, and this caused the automatically-generated default serialVersionUID to change, even though the changes in the serialized form are compatible as far as we can tell.

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