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https://issues.apache.org/jira/browse/XMLRPC-130?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12472533
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Jochen Wiedmann commented on XMLRPC-130:
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That's the point I am trying to make: DecimalFormat can only be used for fixed 
length decimals, not for arbitrary floating point numbers.And, as pointed out 
above, conversion to BigDecimal doesn't seem to be a practical solution.


> Small doubles are serialized in a non-compliant way
> ---------------------------------------------------
>
>                 Key: XMLRPC-130
>                 URL: https://issues.apache.org/jira/browse/XMLRPC-130
>             Project: XML-RPC
>          Issue Type: Bug
>          Components: Releases
>    Affects Versions: 1.2, 2.0, 3.0rc1
>            Reporter: Aren Sandersen
>            Priority: Minor
>             Fix For: 1.2, 2.0, 3.0rc1
>
>
> The double value of  (for example) ".000004" is serialized by XML-RPC as 
> "4.0E-6".  Unfortunately, this does not comply with the XML-RPC spec 
> (http://www.xmlrpc.com/spec) which says:
> "At this time, only decimal point notation is allowed, a plus or a minus, 
> followed by any number of numeric characters, followed by a period and any 
> number of numeric characters."
> So, Java's conversion to the exponential format is not allowed.

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