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From "Stefan Guggisberg (JIRA)" <j...@apache.org>
Subject [jira] Commented: (JCR-542) Allow the removal of an item even if its schema has changed
Date Fri, 11 Aug 2006 08:26:14 GMT
    [ http://issues.apache.org/jira/browse/JCR-542?page=comments#action_12427468 ] 
Stefan Guggisberg commented on JCR-542:

your problem is inconistent repsoitory content. i assume you did the schema changes manually,
i.e. by editing the internal custom_nodetypes.xml file. i have repeatedly pointed out that
this is not recommended because it may lead to inconsistent/corrupt repository content (just
like you've experienced). the proper way to do schema changes is by calling NodeTypeRegistry.reregisterNodeType().
 support for trivial schema changes (those that do not affect the consistency of existing
content) is already implemented.  Jira issue JCR-322 addresses non-trivial schema changes.

> Allow the removal of an item even if its schema has changed
> -----------------------------------------------------------
>                 Key: JCR-542
>                 URL: http://issues.apache.org/jira/browse/JCR-542
>             Project: Jackrabbit
>          Issue Type: Improvement
>          Components: core
>    Affects Versions: 1.0.1
>            Reporter: Florent Guillaume
>            Priority: Minor
> During schema migrations, it is often the case that an item definition changes. For instance,
a property may move from type Long to type String.
> However when jackrabbit is restarted, it's impossible to remove any node having "old"
> javax.jcr.nodetype.ConstraintViolationException: no matching property definition found
for {}myprop
>         at org.apache.jackrabbit.core.nodetype.EffectiveNodeType.getApplicablePropertyDef(EffectiveNodeType.java:797)
>         at org.apache.jackrabbit.core.NodeImpl.getApplicablePropertyDefinition(NodeImpl.java:913)
>         at org.apache.jackrabbit.core.ItemManager.getDefinition(ItemManager.java:161)
>         at org.apache.jackrabbit.core.ItemManager.createPropertyInstance(ItemManager.java:522)
>         at org.apache.jackrabbit.core.ItemManager.createItemInstance(ItemManager.java:477)
>         at org.apache.jackrabbit.core.ItemManager.getItem(ItemManager.java:320)
>         at org.apache.jackrabbit.core.NodeImpl.onRemove(NodeImpl.java:674)
>         at org.apache.jackrabbit.core.NodeImpl.removeChildNode(NodeImpl.java:623)
>         at org.apache.jackrabbit.core.ItemImpl.internalRemove(ItemImpl.java:848)
>         at org.apache.jackrabbit.core.ItemImpl.remove(ItemImpl.java:1034)
> I don't understand enough of the internals to know if it's easy, but could something
be made more lenient to allow such removals?

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