Java and Jasper

Question

Hey Guys, I have integrated Jasper Reports on my netbeans platform and i am able to generate reports using the following code.

      Map<String, Object> params = new HashMap<String, Object>();
        Connection conn = DriverManager.getConnection("databaseUrl", "userid","password");
        JasperReport jasperReport = JasperCompileManager.compileReport(reportSource);
        JasperPrint jasperPrint = JasperFillManager.fillReport(jasperReport, params, conn);
        JasperExportManager.exportReportToHtmlFile(jasperPrint, reportDest);
        JasperViewer.viewReport(jasperPrint);

This stuff works perfect.

But not i am trying to integrate Jasper with GWT.I have my server as glass fish server.

I am getting the Connection object using the followind code.

public static Connection getConnection() {

    try {
        String JNDI = "JNDI name";
        InitialContext initCtx = new InitialContext();
        javax.sql.DataSource ds = (javax.sql.DataSource) initCtx.lookup(JNDI);
        Connection conn = (Connection) ds.getConnection();
        return conn;
    } catch (Exception ex) {
        ex.printStackTrace();
    }
    return null;
}

and then

Map params = new HashMap(); JasperReport jasperReport = JasperCompileManager.compileReport(reportSource); JasperPrint jasperPrint = JasperFillManager.fillReport(jasperReport, params, getConnection()); JasperExportManager.exportReportToHtmlFile(jasperPrint, reportDest); JasperViewer.viewReport(jasperPrint);

but i always get Error.I am implementing this on Server.I am having RPC calls to get this method to work when a button is clicked.

Can you please help me how to work on this.(That is to integrate Jasper reports with GWT).

I would highly appreciate any explanation with some code as i am just a beginner.

Thanks

Answer 1

Without the aid of error messages, I would say that you have Google App Engine enabled in your eclipse project preferences. GAE does NOT allow you to write to the file system, or make calls to a database.

Try disabling GAE, and things should work fine.