How to use method setXSLT

Hi All!
how I can use method setXSLT from OracleXMLQuery class
when I try:
java.lang.NoClassDefFoundError: oracle/xdb/XMLType
oracle.xml.sql.query.OracleXMLQuery.setXSLT(OracleXMLQuery.java:747)
code:
xmlQuery = new OracleXMLQuery(this.mainDbConn.getConn(),sql);
xmlQuery.setXSLT("/[path]/[name].xsl","");

Specify stylesheet as a URI.
xmlQuery.setXSLT("file://c:/util.xslt");this don't work :(

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