Java CookSwing - handling special characters like ä,ö,ü

i need to use CookSwing. I generate the XMLs out of information of a content management system.

If I use any character like ä,ö,ü or ß in these xmls, cookswing doesn't do anything. No exceptions,开发者_开发问答 no rendering of the xml.

How can I handle these characters without replacing them?

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Maybe put the proper encoding

<?xml version="1.0" encoding="ISO-8859-1"?>