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https://jira.codehaus.org/browse/JIBX-418?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=276625#comment-276625
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Klaus Claszen commented on JIBX-418:
------------------------------------
The behavior to set lists of optional collections to null seems to be a bug
since version 1.2.3.
I opened a bug (JIBX-449) on this and would be glad to hear some official
statement.
> Add an option to keep optional object value at its default instead of null
> --------------------------------------------------------------------------
>
> Key: JIBX-418
> URL: https://jira.codehaus.org/browse/JIBX-418
> Project: JiBX
> Issue Type: Wish
> Components: BindGen, core
> Reporter: Markus Sunela
>
> Currently it is possible to specify that an element or an attribute is
> optional. If it's optional and no value is specified in XML then for basic
> types the value is left as is (unless a default value is given in binding)
> but for Object types value is set to null. It would be really useful, if it
> was possible to have an setting that enables leave the Object value untouched
> if it's optional and no value is given in XML. Classical example would be:
> class Foo {
> String name = "foo";
> List values = new List();
> }
> <mapping class="Foo">
> <value name="name" field="name";
> <collection name="values" field="values" usage="optional"/>
> </mapping>
> Now when XML is read, values field is set to null if no values element was
> given in XML. Then user has to handle somehow the situation of list being
> null in the code, which clutters the code. This kind of situations can happen
> easily, for example when extending already existing schemas and wanting to
> preserve compatibility with older versions.
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