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

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

Dan Haywood created ISIS-1226:
---------------------------------

             Summary: 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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