Andreas Veithen created XERCESJ-1582:
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Summary: Node#lookupNamespaceURI throws NullPointerException on
document without document element
Key: XERCESJ-1582
URL: https://issues.apache.org/jira/browse/XERCESJ-1582
Project: Xerces2-J
Issue Type: Bug
Components: DOM (Level 3 Core)
Affects Versions: 2.9.1
Reporter: Andreas Veithen
Priority: Minor
According to appendix B.4 of the DOM Level 3 Core specification, calling
Node#lookupNamespaceURI on a Document node actually performs the lookup on the
document element. This is implemented by Xerces, but the code doesn't take into
account that the Document may be empty (or not have a document element). On
such Document instances, the lookupNamespaceURI throws a NullPointerException.
The issue can be demonstrated using the following code:
Document document =
DocumentBuilderFactory.newInstance().newDocumentBuilder().newDocument();
System.out.println(document.lookupNamespaceURI("p"));
It is caused by the following piece of code in NodeImpl:
case Node.DOCUMENT_NODE : {
return((NodeImpl)((Document)this).getDocumentElement()).lookupNamespaceURI(specifiedPrefix);
}
The issue has been observed with Xerces 2.9.1, but the code in the trunk is
unchanged.
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