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>if (!chhh.getFirstChild().getNodeValue().equals(null))
Here you are testing whether the string value of the first child node of chh
is equal to null. No string in Java ever equals(null) - String.equals(object)
only ever returns true if the object is an instanceof String, and null is not an
instanceof anything.
If chhh has no children, such as the <description/> element in
your example, there is no first child, and getFirstChild() will return null
[1]. Attempting to call getNodeValue() on that null reference will cause a
NullPointerException to be thrown, which you are observing.
If you are using Java 1.4, use (chhh.getFirstChild() != null) or
(chhh.getChildCount() > 0) before walking down the tree accessing the text
(and remember that if your source document has not been normalised or contains
comments or processing instructions the text content of the element may be
spread across many nodes, and the node value of the first node may not be text
content).
If you are using Java5 then calling getTextContent() [2] on chhh hides
these complications.
Pete
1: http://java.sun.com/j2se/1.4.2/docs/api/org/w3c/dom/Node.html#getFirstChild()
2: http://java.sun.com/j2se/1.5.0/docs/api/org/w3c/dom/Node.html#getTextContent()
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