RFR [14/java.xml] 8016914: CoreDocumentImpl.setXmlVersion NPE

[Lance Andersen]

Hi Joe,

The change looks fine as does the test.

Best
Lance
> On Sep 27, 2019, at 12:29 PM, Joe Wang <huizhe.wang at oracle.com> wrote:
> 
> Please review a fix to the NPE issue. This is part of the work on the XML declaration related issues.
> 
> JBS: https://bugs.openjdk.java.net/browse/JDK-8016914
> webrev: http://cr.openjdk.java.net/~joehw/jdk14/8016914/webrev/
> 
> Thanks,
> Joe

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