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ireport and java web start


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hi, i have a classroom to execute an archive .jasper with the Java Web Start



ResultSet results = Conectar.execSQL( " select * from .... " ) ;
JRResultSetDataSource dataSource = new JRResultSetDataSource( results );
HashMap parameters = new HashMap();
JasperPrint rel = JasperFillManager.fillReport( this.getClass().getResourceAsStream("boleto_bbr.jasper"«») , parameters, dataSource);
JasperViewer viewer = new JasperViewer(rel, false);


when I execute my application in web, does not function, when I execute place, it functions.


the error in web :

"error loading expression class"


what I can make ?

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