encoding ISO-8859-15 error

Hi,
I'm reciving an XML file with encoding="ISO-8859-15", when I transform the
file I received javax.xml.transform.TransformerException. java.io
UnsupportedEncodingException ISO8859_15
If I use ISO-8859-1 it's work fine but I can't. I'm working with java.1.3
1_09 and just 
download xalan-j_2_5_1
Thanks for any help!
Jac

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