Empty CDATA section is not retrievable (child is null)
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Key: XERCESJ-1033
URL: http://nagoya.apache.org/jira/browse/XERCESJ-1033
Project: Xerces2-J
Type: Bug
Components: DOM
Versions: 2.6.2
Environment: JDK 1.4.2
Reporter: Detlev Beutner
If a CDATA section is empty, ie <![CDATA[]]>, it is not possible to retrieve
this node (eg by getFirstChild()). Instead, null is returned.
>From org.w3c.dom.Node javadoc, getFirstChild() only returns null if there is
>*no* child. And if there is a CDATA section child, getNodeValue returns
>"content of the CDATA Section", so in this case by
>getFirstChild().getNodeValue() an empty string must be returned. In fact, by
>this call, a NullPointerException gets thrown.
XML-test-document:
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<test><![CDATA[]]></test>
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Java-test-program:
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import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
public class XercesTester {
public static void main(String[] args) {
try{
DocumentBuilderFactory factory =
DocumentBuilderFactory.newInstance();
DocumentBuilder parser = factory.newDocumentBuilder();
Document doc = parser.parse("c:/test.xml");
Element testNode = doc.getDocumentElement();
System.out.println("Test Root Node: " + testNode.getNodeName());
System.out.println("Node Value of Root Node: " +
testNode.getNodeValue());
Node cDataNode = testNode.getFirstChild();
if (cDataNode == null) {
System.out.println("CDATA Node is null - everything stopped,
xml implementation failed!");
} else {
System.out.println("CDATA Node: " + cDataNode.getNodeName());
System.out.println("Node Value of CDATA Node: ---" +
cDataNode.getNodeValue() + "---");
}
} catch (Exception e) {
e.printStackTrace();
}
}
}
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