GWT Spring Jasper Reports - spring

Question

I have an application built in GWT and Spring. I am trying to generate Jasper Reports on the server side. However when I execute the functionality, it hangs/stops at jasperDesign = JRXmlLoader.load(file_name); and does not respond or throw an exception. This means that my RPC call that triggers the report generation function does not return a response either (so the application hangs). However when I run the function in a normal java application it generates a report without any problem. What could be the issue? I am using JasperReports version 5.6.0. My java function:
public StandardServerResponse printReport(List<Object> items) {
StandardServerResponse response = new StandardServerResponse();
String file_name = null;
Map<String, Object> parameters;
JasperDesign jasperDesign;
JasperReport jasperReport;
JasperPrint jasperPrint;
try {
for (Object obj: items) {
parameters = new HashMap<String, Object>();
parameters.put("id_in", obj.getId());
file_name = "G:\\myreport.jrxml";
jasperDesign = JRXmlLoader.load(file_name); //application stops here
jasperReport = JasperCompileManager.compileReport(jasperDesign);
jasperPrint = JasperFillManager.fillReport(jasperReport, parameters, dataSource.getConnection());
JasperExportManager.exportReportToPdfFile(jasperPrint, "G:\\report.pdf");
}
response.setSuccess(true);
} catch (Exception ex) {
ex.printStackTrace();
response.setSuccess(false);
}
return response;
}

Answer 1

I finally solved my problem after many long days of debugging :-).
I had these two jars in my WEB-INF/lib folder.
jasperreports-functions-5.6.0-SNAPSHOT.jar
jasperreports-fonts-5.6.0.jar
I removed them and the app worked. I still don't understand why they would cause a problem though.
I also changed my code to work with a .jasper extension and directly called JasperRunManager.runReportToPdfFile(file_name, "S:\\output_report.pdf", parameters, connection);
Thanks a lot Darshan Lila for trying, I really appreciate. Hope this helps someone.