[jira] [Resolved] (ISIS-1226) Drop-down breadcrumbs broken.

["Dan Haywood (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ISIS-1226?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Dan Haywood resolved ISIS-1226.
-------------------------------
    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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