Help on a NullPointerException error

Question

I have been trying to modify the following code in JSP from here:

ArrayList arrayList=new ArrayList(); 
String  = "tagToFind";
Node n = node.getParentNode();
String printOut = "";
while (n != null && !n.getNodeName().equals(tagToFind)) {   
    n = n.getParentNode();
}
if (n.getNodeValue() != null){
    arrayList.add(n.getNodeValue());
}

on the "if (n.getNodeValue() != null){" line I get a "NullPointerException" error. I don't understand why I'm getting that error as I'm trying to test for Nulls and skip them.

Can anyone help me over come this issue?

djna · Accepted Answer · 2010-10-21 09:31:56Z

1

on exit from your while loop n may be null. Hence n.getNodeValue() may give your NPE.

answered Oct 21, 2010 at 9:31

djna

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Comments

Sachin Shanbhag · Accepted Answer · 2010-10-21 09:32:24Z

0

Your while loop will exit when n == null too. Hence there are possibilities that your 'n' is null in this case. Check for n != null in your last IF condition.

answered Oct 21, 2010 at 9:32

Sachin Shanbhag

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kukudas · Accepted Answer · 2010-10-21 09:31:49Z

0

Probably because n.getNodeName() is null or n is null after the loop.

answered Oct 21, 2010 at 9:31

kukudas

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Comments

kasten · Accepted Answer · 2010-10-21 09:32:52Z

0

Can node.getParentNode() return null? If it can your n might be null.

answered Oct 21, 2010 at 9:32

kasten

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