You can use the Class of "JRLoader".
example:
File reportFile = new File(servletContext.getRealPath("/reports/testreport2.jasper"));
JasperReport subreport = (JasperReport)JRLoader.loadObject(reportFile.getPath());
example:
File reportFile = new File(servletContext.getRealPath("/reports/testreport2.jasper"));
JasperReport subreport = (JasperReport)JRLoader.loadObject(reportFile.getPath());
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