DO NOT REPLY [Bug 28762] New: - NullPointerException in TreeWalker

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http://issues.apache.org/bugzilla/show_bug.cgi?id=28762

NullPointerException in TreeWalker

           Summary: NullPointerException in TreeWalker
           Product: XalanJ2
           Version: 2.5
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: Normal
          Priority: Other
         Component: org.apache.xml.utils
        AssignedTo: xalan-dev@xml.apache.org
        ReportedBy: jdiezgome@ebankinter.com


This is the code That produces de error.
package org.yokin.test;

import java.io.FileReader;
import java.io.StringWriter;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.transform.OutputKeys;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;

import org.w3c.dom.Document;
import org.w3c.dom.Node;
import org.xml.sax.InputSource;

public class TestTransformerFactory {

	public static void main(String[] args) {
		
		TestTransformerFactory obj = new TestTransformerFactory();
	
		
		Node nodo = null;
		Node texto = null;
		Node rootNode = null;
		Document doc  = getDocumentBuilder().newDocument();
		
		rootNode = doc.createElement("ROOT");
		doc.appendChild(rootNode);
		
		nodo = doc.createElement("HOLA");
		texto = doc.createTextNode("saludos");
		nodo.appendChild(texto);	
		
		rootNode.appendChild(nodo);
		
			
		nodo = doc.createElement("HOLA2");
		texto = doc.createTextNode(null);
		nodo.appendChild(texto);	
		
		rootNode.appendChild(nodo);
		

		
		obj.toString(doc);
	}
	
	
	private void toString(Document doc){
		
		try{
			StringWriter stringOut = new StringWriter();
			TransformerFactory trasnFactory = TransformerFactory.newInstance();
			
			Transformer transformer = trasnFactory.newTransformer();
			
			transformer.setOutputProperty(OutputKeys.ENCODING, "ISO-8859-1");
			
			DOMSource source = new DOMSource(doc);
			
			StreamResult streamResult = new StreamResult(stringOut);
			
			transformer.transform(source, streamResult);
			
			System.out.println(stringOut.getBuffer().toString());
		
		}catch(Exception e){
			e.printStackTrace();
			System.out.println(e);
		}
		
	}
	
	
	public static Document getXMLFile(String xmlFile) {
	Document objDoc = null;

	try {
		
		FileReader fileRead = new FileReader(xmlFile);
		InputSource inputsource = new InputSource(fileRead);

		
		objDoc = getDocumentBuilder().parse(inputsource);
	} catch (Throwable theException) {
		theException.printStackTrace();
		System.out.println("File Exception : " + theException.getMessage());
	}

		return objDoc;
	}
	
	public static DocumentBuilder getDocumentBuilder(){
		try{
			
			
			
			DocumentBuilderFactory docbF = DocumentBuilderFactory.newInstance();
			DocumentBuilder docb = docbF.newDocumentBuilder();
			
			
			
			return docb;
		}catch(javax.xml.parsers.ParserConfigurationException e){
			System.out.println("ERROR Configuracion Parser : " + e);
			return null;
		}					
	}
}

When I add a Text node and the String I am adding has null value, I get the
Exception that you can see above. I know I should never add a null String value,
but thar happends sometimes...

I think it should be better if instead of return an null pointer exception, you
control this posibility and change the null value by an empty string.


I get the next exception :

java.lang.NullPointerException
	at org.apache.xml.utils.TreeWalker.dispatachChars(TreeWalker.java:259)
	at org.apache.xml.utils.TreeWalker.startNode(TreeWalker.java:403)
	at org.apache.xml.utils.TreeWalker.traverse(TreeWalker.java:167)
	at
org.apache.xalan.transformer.TransformerIdentityImpl.transform(TransformerIdentityImpl.java:325)
	at org.yokin.test.TestTransformerFactory.toString(TestTransformerFactory.java:76)
	at org.yokin.test.TestTransformerFactory.main(TestTransformerFactory.java:58)

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