retrieving element values from xml in java

I have multiple tags <a>value</a>. in different nodes. like
<root>
<x>
 <a>value</a>
</x>
<y>
 <a>value</a>
</x>
<x>
<xcv>
 <a>value</a>
</xcv>
</y>
<z>
 <a>value</a>
</z>
</root>

i want to retrieve all 'a' values.  

appreciate any help
narcist527Asked:
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gurpsbassiCommented:
There are multiple ways to do it.

XPath is the key here.

Are you using any XML library or are you constrained to using javax.xml API?
0
narcist527Author Commented:
@gurpsbassi

we can not use xpath here since it is not specific. it can be any where. I am using DOM parser to retrieve .
0
gurpsbassiCommented:
I disagree.

Ok, It can be anywhere in the DOM. That doesn't matter to XPATH.

the expression //a will find you all 'a' nodes in the DOM.
0

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narcist527Author Commented:
below one is my code and it is returning 0 elements . any help where I am making mistake? I am using the xml file .

XPath xPath = XPathFactory.newInstance().newXPath();
        InputSource docu = new InputSource(new InputStreamReader(new FileInputStream(new File(file))));
        String xpression = "//a";
 NodeList nodes = (NodeList) xPath.compile(xpression).evaluate(docu,XPathConstants.NODESET);
0
CEHJCommented:
http://technojeeves.com/index.php/aliasjava1/26-xpath-tester

The expression given to you works fine with that (after correcting your xml)
0
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