XML Parse error

[sheed]

Hi,

I have a following code and need some help. When I try to run it it gives me the following error:

java.lang.IndexOutOfBoundsException: Index: 0, Size: 0
	at java.util.ArrayList.RangeCheck(ArrayList.java:507)
	at java.util.ArrayList.get(ArrayList.java:324)
	at LoadWithDOM.printElements(LoadWithDOM.java:37)
	at LoadWithDOM.main(LoadWithDOM.java:25)

Here is the code I am trying to run:

import java.io.FileNotFoundException;
import java.io.IOException;

import oracle.xml.parser.v2.DOMParser;

import java.io.*;
import java.util.*;

import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.DocumentHelper;
import org.dom4j.io.DOMReader;
import org.dom4j.Element;

public class LoadWithDOM
{
	public static void main(String[] args)
  {
	  try
	  {
			LoadWithDOM lWithDOM = new LoadWithDOM();      
      DOMParser parser = new DOMParser();
      parser.parse(new FileInputStream("C://Samples//Parse//test.xml"));
      org.w3c.dom.Element element = parser.getDocument().getDocumentElement();      
			lWithDOM.printElements(element);
	  }
    catch(Exception e)
	  {
      e.printStackTrace();
	  }
	}
	
	public void printElements(org.w3c.dom.Element request) throws DocumentException
	{			
      DOMReader reader = new DOMReader();
      Document doc = reader.read(request.getOwnerDocument());      
      Element n = ((Element)((Element)doc.getRootElement().elements().get(0)).elements().get(0));
     
      Iterator elementIterator = n.elementIterator("innersecond");   
      while(elementIterator.hasNext())
      {
        Element element = (Element)elementIterator.next();
        System.out.println("Element name " + element.getName());  
      }      
		}
}

I can't really figure it out so need some help in debugging it and why am I getting the error as it throughs an error on
Element n = ((Element)((Element)doc.getRootElement().elements().get(0)).elements().get(0));

Here is the sample xml file I am using:

<?xml version="1.0" encoding="UTF-8"?>
<outer>
	<firstrow>firstrow</firstrow>
	<secondrow>secondrow</secondrow>
	<thirdrow>thirdrow</thirdrow>
	<fourthrow>fourthrow</fourthrow>
	<lastr>lastr</lastr>
	<innerfirst>
		<birthdayMonth>January</birthdayMonth>
		<birthdayDay>21</birthdayDay>
		<birthdayYear>1983</birthdayYear>
		<secondlevel>
			<first>first</first>
			<second>second</second>
			<thirdlevel>
				<fourth>fourth</fourth>
			</thirdlevel>
			<thirdlevels>
				<fourths>fourths</fourths>
			</thirdlevels>
		</secondlevel>
		<test>test</test>
		<secondlevelss>
			<firsts>first</firsts>
			<seconds>second</seconds>
			<thirdlevels>
				<fourths>fourth</fourths>
			</thirdlevels>
			<thirdlevelss>
				<fourthss>fourths</fourthss>
				<fifth>
					<fifthf>fifthf</fifthf>
					<sixth>
						<sixthf>sixth</sixthf>
					</sixth>
				</fifth>
			</thirdlevelss>
		</secondlevelss>
	</innerfirst>
	<innersecond>
		<value1>value1</value1>
		<value2>value2</value2>
		<value3>val3</value3>
	</innersecond>
</outer>

Now if I remove the following from the test file I don't get any error but the while never gets executed either:

<firstrow>firstrow</firstrow>
	<secondrow>secondrow</secondrow>
	<thirdrow>thirdrow</thirdrow>
	<fourthrow>fourthrow</fourthrow>
	<lastr>lastr</lastr>

Can someone help > Thanks

 

[sedj]

I think it is because this line :

Element n = ((Element)((Element)doc.getRootElement().elements().get(0)).elements().get(0));

is asking for :

Get the document root.
Get the first child from that (<firstrow>).
Get the first child from that tag ... but that tag has no children.

You want something a bit more like :

NodeList list = (((Element)doc.getRootElement().elements();
if (list.getLength() > 0) {
   // and so on
} else {
   // and so on
}

--------------------------------------------------
Free Java/J2EE Database Connection Pooling Software

http://www.primrose.org.uk