SAX DefaultHandler: calls characters() twice for each (atom) element?

I use sax to parse an xml file. i subclassed org.xml.sax.helpers.DefaultHandler and overwrote the corresponding methods like characters(). the problem is, that this method is called twice for each element value if this element has no subelements. example:
<collection>
<one>1</one>
<two>2</two>
<three>3</three>
</collection>
with this xml, characters is called once for <collection> but twice for each <one>, <two>, <three> element. why? is this a bug or is this customizable?

Look at what data is being passed to the method. The SAX specification allows the parser to pass the text node to characters() in pieces, it doesn't require it to pass the entire text in one call. And parsers do take advantage of that, in various ways. You'll have to assemble the data in the characters() method, but you can't assume you have all the data until endElement() is called.
I wouldn't expect your example to be a problem, but I suppose it's just an example and not the actual data you were processing.
Or possibly you are getting calls for the whitespace? In your example, your collection element has seven children: a text node containing a newline character, a one element, another newline text node, a two element, another newline text node, and so on.

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SAX DefaultHandler: calls characters() twice for each (atom) element?

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