From http://www.mkyong.com/java/how-to-read-utf-8-xml-file-in-java-sax-parser/ :

Reader reader = new InputStreamReader(inputStream,"UTF-8");
InputSource is = new InputSource(reader);
is.setEncoding("UTF-8");

For Jasper Reports this means going into JRXmlLoader.loadXML(InputStream is) and making an InputSource with code like the above example. Or, even better, allow the caller of the JasperReport API to specify an encoding. UTF-8 is a good default because that's what iReport generates.

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        for (int i=0; i < subReportName.size(); i++) {
            jrxml.append("t""+subReportName.get(i)+"_JasperReport" class="net.sf.jasperreports.engine.JasperReport"/>n");
        }

I reference these parameters in element subReportExpression

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"tttt"net.sf.jasperreports.engine.JasperReport">+subReportName.get(i)+"_JasperReport}]]>n" +

And it works. Unfortunately, I have a blank page