[ http://issues.apache.org/jira/browse/COCOON-1867?page=all ]
Antonio Gallardo reassigned COCOON-1867:
----------------------------------------
Assignee: Antonio Gallardo (was: Simone Gianni)
> BeanConvertor uses a WeakHashMap in the wrong way.
> --------------------------------------------------
>
> Key: COCOON-1867
> URL: http://issues.apache.org/jira/browse/COCOON-1867
> Project: Cocoon
> Issue Type: Bug
> Components: Blocks: Forms
> Affects Versions: 2.1.9, 2.1.10-dev (current SVN)
> Reporter: Simone Gianni
> Assigned To: Antonio Gallardo
> Priority: Critical
> Attachments: BeanConvertor-1867.diff
>
>
> In the BeanConvertor, when a bean is converted to a string, the bean is
> stored in a WeakHashMap this way :
> m_objects.put(idValue, value);
> Actually idValue is a string representing the bean (toString or evalued on
> id_path) while the value is the bean.
> WeakHashMap DOES NOT remove a mapping when the bean is garbage collected, but
> actually removes it when the KEY is garbage collected. This means that since
> the string is serialized to XML in the form instance and then dropped, the
> mapping could be removed even while the user is filling the form, with the
> conseguence that the convertor stops working, see a null value, reports a
> validation error, even if the user correctly filled the form.
> This is even worse when you are using a selection list of beans, because in
> that case the bean has no chanches to enter the m_objects map anymore, since
> the selection list has been generated and stored st the beginning of the form
> (maybe thru flow, or on-create) and is not asking the convertor to convert
> the beans anymore.
> A better solution (and IMMO what the author intended to do) is to remove the
> mapping (so that the map does not hold references for everything) when the
> BEAN gets garbage collected. In this case I'm experimenting with apache
> commons ReferenceMap, which actually can remove mappings when the value
> (bean) is garbage collected.
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