Highlight an Greek

[jim]

Hello

i am having the following code to highlight a text
public String highlight(String text, String query ) throws IOException {
TermQuery query = new TermQuery(new Term("f", query));
    QueryScorer scorer = new QueryScorer(query);
    SimpleHTMLFormatter formatter =
        new SimpleHTMLFormatter("<span class=\"highlight\">",
            "</span>");
    Highlighter highlighter = new Highlighter(formatter, scorer);
    Fragmenter fragmenter = new SimpleFragmenter(50);
    highlighter.setTextFragmenter(fragmenter);

    TokenStream tokenStream = new GreekAnalyzer()
        .tokenStream("f", new StringReader(text));

    String result = highlighter.getBestFragments(tokenStream, text, 5, "...");

  return result;
}

if i use a text with english characters works fine if i try a text  
with Greek Character i am getting en empty string as result.
Why?

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