Re: [Simple-support] Avoiding NullPointerException

[Niall G. <gal...@ya...>]

Hi,

If you could send me a test case that would be great. Empty elements are null in Simple. There is an empty= attribute on @Attribute and @Text which let you specify a substitute to null. For example

@Attribute(empty="[NULL]")
private String name;

This will mean an attribute of 

<element name="[NULL]">

Will deserialize the attribute name null. Also text like

@Text(empty="This is null")
private String value;

<text>This is null</text>

Will deserialize to null. However there is no such setting for a value in a map. I would greatly appreciate it if you could supply a test case to help me improve the overall stability of the project. Looks like an edge case around representing primitives as java.lang.Object again.

Thanks,
Niall



--- On Mon, 2/23/09, Alan Deikman <Ala...@zn...> wrote:

> From: Alan Deikman <Ala...@zn...>
> Subject: [Simple-support] Avoiding NullPointerException
> To: sim...@li...
> Date: Monday, February 23, 2009, 1:20 PM
> Niall,
> 
> Thanks for the recent update to 2.0.3.   It wasn't
> holding me up but it is great to get past that problem.
> 
> On to something else:  I think this has been discussed
> before, but I couldn't find it in the archives.  It has
> to do with serializing the empty String value: "".
>  When reading it back in, you get a NullPointerException if
> the element is not marked required=false.
> 
> So how do we deal with that in a collection?   My test case
> produces the following document:
> 
> <simpleBug1 id="0">
>    <test1 id="1">
>       <data id="2">
>          <entry>
>             <string
> id="3">key1</string>
>             <object class="java.lang.String"
> id="4">value</object>
>          </entry>
>          <entry>
>             <string
> id="5">key2</string>
>             <object class="java.lang.String"
> id="6"></object>
>          </entry>
>       </data>
>    </test1>
> </simpleBug1>
> 
> Reading it back in gets:
> 
> 	Exception: java.lang.NullPointerException
> 	java.lang.NullPointerException
>         	at
> org.simpleframework.xml.core.Traverser.read(Traverser.java:79)
>         	at
> org.simpleframework.xml.core.CompositeValue.read(CompositeValue.java:102)
>         	at
> org.simpleframework.xml.core.CompositeMap.populate(CompositeMap.java:177)
> 
> etc.  If you want me to send you the test case let me know,
> but again I don't know if this is a problem with simple
> or something I sould be doing but ain't.  Thanks again.
> 
> -- 
> Alan Deikman
> 
> 
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