NameValuePair array 1

[aswolff]

Hello, I am trying to streamline my code to make use of a loop to populate a NameValuePair array. My code compiles..but I get a run-time error:
Exception in thread "main" java.lang.NullPointerException
at lawsonUtil.NVPFromXML(lawsonUtil.java:34)
at WebApplicant.main(WebApplicant.java:72)

code before which compiles and runs fine.....

	public static NameValuePair[] NVPFromXML(Document indoc)
	{
		indoc.getDocumentElement().normalize();
		NodeList nl = indoc.getElementsByTagName("*");
		for (int i=1; i<nl.getLength(); i++)  
		{
			Element elem = (Element) nl.item(i);
			System.out.println(elem.getNodeName() + "==>" + elem.getFirstChild().getNodeValue());
		}

		NameValuePair nvpPdl = new NameValuePair("_PDL","TEST");
    		NameValuePair nvpTkn = new NameValuePair("_TKN","PA31.1");
		NameValuePair nvpRtn = new NameValuePair("_RTN","DATA");
		NameValuePair nvpf1  = new NameValuePair("_f1","A");
		NameValuePair nvpf10  = new NameValuePair("_f10","3000");

		NameValuePair[] nvpout = {nvpPdl, nvpTkn, nvpRtn, nvpf1, nvpf10}; 
		return nvpout;
	}

code after which compiles but does not run....

	public static NameValuePair[] NVPFromXML(Document indoc)
	{
		indoc.getDocumentElement().normalize();
		NameValuePair[] nvpOut = null;

		NodeList nl = indoc.getElementsByTagName("*");
		for (int i=1; i<nl.getLength(); i++)  
		{
			Element elem = (Element) nl.item(i);
			System.out.println(elem.getNodeName() + "==>" + elem.getFirstChild().getNodeValue());
			nvpOut[i-1] = new NameValuePair(elem.getNodeName(), elem.getFirstChild().getNodeValue());  <===This is the line that fails
		}

	return nvpOut;
	}

I am sure it has to do with how I am populating my array..maybe I need to use the "fill" method to populate my array?

Thanks!

 

[aswolff]

One last thing...I did try the below code to see if it would make a difference but I am still getting a Null Pointer Exception..

        for (int i=1; i<nl.getLength(); i++)
        {
            Element elem = (Element) nl.item(i);
            System.out.println(elem.getNodeName() + "==>" + elem.getFirstChild().getNodeValue());
            NameValuePair tmp = new NameValuePair(elem.getNodeName(), elem.getFirstChild().getNodeValue());
            Arrays.fill(nvpOut, i-1, i, tmp);

 

[stefanwagner]

Listing 2:
NameValuePair[] nvpOut = null;

Here you define an array of type NameValuePair, but without any size.

nvpOut[i-1] is not accessible because nvpOut is null (you told so!).
Try this:

NameValuePair[] nvpOut =NameValuePair[nl.getLength()];

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[Diancecht]

I don't know what a NameValuePair is but ... what about a Hashtable?

Cheers,
Dian

 

[aswolff]

Yes. I realized my mistake right after I posted the listing.

Thanks for your response..you are right on target!