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http://issues.apache.org/jira/browse/MYFACES-736?page=comments#action_12357512 
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Sylvain Vieujot commented on MYFACES-736:
-----------------------------------------

I didn't find how to fix this yet, but here is a workaround.
As NumberFormat.parse returns either a Long or a Double, the workaroud way is :

- For Integer values, use only Long or long accessor types.

- For non Integer, use only Number (as an integer value, like 3, will return a 
Long, and a non integer, as 3.14 will return a Double). So, using a Double or 
double will fail for integer values. So, Number is the only safe way.

> Number converter not working with Number
> ----------------------------------------
>
>          Key: MYFACES-736
>          URL: http://issues.apache.org/jira/browse/MYFACES-736
>      Project: MyFaces
>         Type: Bug
>   Components: Implementation
>     Versions: Nightly
>     Reporter: Sylvain Vieujot

>
> If the backing bean setter takes a Number argument (Integer, Float, ...), the 
> converter fails :
> Conversion Error "XXX: Error during model data update.
> If the setter uses a primitive type, then it works fine.
> This worked with the trunk version from September 30.
> There must have been a change that broke it since.

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