NPE in org.apache.xml.serializer.ToHTMLSAXHandler
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Key: XALANJ-2023
URL: http://nagoya.apache.org/jira/browse/XALANJ-2023
Project: XalanJ2
Type: Bug
Components: Serialization
Versions: 2.6
Reporter: Ken Weiner
Attachments: ToHTMLSAXHandler-patch.txt
On line 360 of org.apache.xml.serializer.ToHTMLSAXHandler, the code does not
check to see if a lexical handler has been set before trying to call a method
on it. The result is the following stack strace when comments are present in
the XML:
Caused by: java.lang.NullPointerException
at
org.apache.xml.serializer.ToHTMLSAXHandler.comment(ToHTMLSAXHandler.java:360)
at org.apache.xpath.objects.XString.dispatchAsComment(XString.java:287)
at
org.apache.xml.dtm.ref.DTMTreeWalker.startNode(DTMTreeWalker.java:233)
at
org.apache.xalan.transformer.TreeWalker2Result.startNode(TreeWalker2Result.java:144)
at org.apache.xml.dtm.ref.DTMTreeWalker.traverse(DTMTreeWalker.java:114)
at
org.apache.xalan.transformer.TreeWalker2Result.traverse(TreeWalker2Result.java:72)
at org.apache.xalan.templates.ElemCopyOf.execute(ElemCopyOf.java:185)
at
org.apache.xalan.templates.ElemApplyTemplates.transformSelectedNodes(ElemApplyTemplates.java:395)
at
org.apache.xalan.templates.ElemApplyTemplates.execute(ElemApplyTemplates.java:177)
at
org.apache.xalan.transformer.TransformerImpl.executeChildTemplates(TransformerImpl.java:2336)
... 21 more
The fix is to add the guard against a null lexical handler:
if (m_lexHandler != null)
m_lexHandler.comment(arg0, arg1, arg2);
This guard has been added in the similar comment() method of the
ToXMLSAXHandler class in the same package.
Possible workaround: Create a dummy LexicalHandler implementation and set that
on the XMLReader before attempting the transformation.
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