[jira] [Commented] (CXF-2916) unmarshalling the JSON of a subclass fails when a field value is null

["Sergey Beryozkin (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CXF-2916?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13016819#comment-13016819 ] 

Sergey Beryozkin commented on CXF-2916:
---------------------------------------

Andrew, your patch has been applied to Jettison 1.3-SNAPSHOT trunk, thanks.

Just FYI, JAXB, as opposed to Aegis, reports an empty string instead of null.

I suspect this is because Jettison now reports START and END element events but does not report CHARACTERS if 'currentValue' is null so JAXB assumes it is the case of something like <id></id>, thus, when we have 'String id', it sets the value of it to "".

I reckon that Jettison may need to enhanced a bit more to deal with properly, that is, if currentValue is null, then, rather than reporting START_ELEMENT, it has to completely skip the current node, but only if it is a simple element, possibly calling processElement() instead of setting an event to START_ELEMENT.

However, I'm not too worried if that not get fixed right now, empty value is definitely better than "null" and as you can see Aegis defaults to "" in case of null.

Please also check JSONProvider.testReadListOfDerivedTypesWithNullField  




> unmarshalling the JSON of a subclass fails when a field value is null
> ---------------------------------------------------------------------
>
>                 Key: CXF-2916
>                 URL: https://issues.apache.org/jira/browse/CXF-2916
>             Project: CXF
>          Issue Type: Bug
>          Components: JAX-RS
>    Affects Versions: 2.2.9
>         Environment: Windows XP,  JDK 1.6.0_14
>            Reporter: Chaitanya Choleti
>         Attachments: CXF-2916-jettison.patch, CXF-2916.patch
>
>   Original Estimate: 24h
>  Remaining Estimate: 24h
>
> Unmarshalling the JSON :
> {"@xsi.type" : "subClassTest", "id" : "10000000", "name" : null }
> should give an instance of SubClassTest.class and the value of the field name(which is a String) should be null, but with the current implementation the value of the field name is String "null" .
> This happens only in the case of unmarshalling JSON to a subclass.

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