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https://issues.apache.org/jira/browse/ISIS-1226?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Dan Haywood resolved ISIS-1226.
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Resolution: Fixed
> Drop-down breadcrumbs broken.
> -----------------------------
>
> Key: ISIS-1226
> URL: https://issues.apache.org/jira/browse/ISIS-1226
> Project: Isis
> Issue Type: Bug
> Components: Core
> Affects Versions: 1.9.0
> Reporter: Dan Haywood
> Assignee: Dan Haywood
> Priority: Minor
> Fix For: 1.10.0
>
>
> The BreadcrumbModel is held by the session (specifically, the
> AuthenticatedWebSessionForIsis, subclass of a Wicket session class).
> This holds a list of EntityModels.
> The EntityModels are LoadableDetachable, which caches the underlying
> ObjectAdapter in a transient field.
> It seems that the model isn't being serialized/deserialized, and there is no
> explicit detach, thus on the next request the EntityModel still holds the
> ObjectAdapter (for the previous PersistenceSession) and which in turn holds
> the pojo. From JDO/Datanucleus' perspective, this pojo is not persistent.
> As per ISIS-1194 simplificaitons, we now delegate to the pojo to determine
> whether it is persistent or not; and so JDO/DN reports that this pojo is NOT
> persistent.
> In turn this gives us a "" empty string for the oid str, and things then
> break.
> ~~~
> The fix is to explicitly detach all the EntityModels of the BreadcrumbModel.
> This can be done by hooking into the AuthenticatedWebSessionForIsis#detach()
> hook.
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