StaxUtils.copy fails on pure DOM comment node
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                 Key: CXF-3034
                 URL: https://issues.apache.org/jira/browse/CXF-3034
             Project: CXF
          Issue Type: Bug
          Components: Core
            Reporter: Andreas Veithen
            Priority: Minor


When StaxUtils.copy is used with an XMLStreamReader created from a DOM tree 
containing a comment node, it will fail with a NullPointerException:

java.lang.NullPointerException
    at 
com.ctc.wstx.sw.BufferingXmlWriter.verifyCommentContent(BufferingXmlWriter.java:1467)
    at 
com.ctc.wstx.sw.BufferingXmlWriter.writeComment(BufferingXmlWriter.java:591)
    at com.ctc.wstx.sw.BaseStreamWriter.writeComment(BaseStreamWriter.java:513)
    at org.apache.cxf.staxutils.StaxUtils.copy(StaxUtils.java:477)
    at org.apache.cxf.staxutils.StaxUtils.copy(StaxUtils.java:452)

Note that this only occurs with a pure DOM implementation, not with SAAJ. The 
reason is that in SAAJ, a comment node also implements org.w3c.dom.Text.

A test case can be found in attachment. The issue occurs with current trunk 
(r1004461).

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