java.lang.OutOfMemoryError: Java heap space in JasperReports

Question

In my swing application when I am going to print, following exception is given.but not always, like trice a time. it occurs when the following code is executed in jasper reporting. How can I solve this issue?

    Exception occurred during event dispatching:
    java.lang.OutOfMemoryError: Java heap space

        JRBeanCollectionDataSource datasource = new JRBeanCollectionDataSource(purchasingList);
        JasperPrint jasperPrint = JasperFillManager.fillReport(in, params, datasource);

        if (view) {// using a JDialog a preview of the print is showed.
             new Shows().showJasper(jasperPrint, "Invoice No:" + invoiceNo);
        }

        final JRPrintServiceExporter exporter = new JRPrintServiceExporter();
        exporter.setParameter(JRExporterParameter.JASPER_PRINT, jasperPrint);
//      exporter.setParameter(JRPrintServiceExporterParameter.DISPLAY_PAGE_DIALOG, Boolean.FALSE);
        exporter.setParameter(JRPrintServiceExporterParameter.DISPLAY_PRINT_DIALOG, Boolean.TRUE);
        exporter.exportReport();

possible duplicate of java.lang.OutOfMemoryError: Java heap space in jasper report — Matthew Farwell
– Matthew Farwell, Commented Nov 10, 2011 at 9:37

LoSciamano · Accepted Answer · 2011-11-10 09:39:11Z

1

You can use the -Xmx option of the JVM. Launch your application with more heap memory.
e.g.

      java -Xmx512M YourClass

answered Nov 10, 2011 at 9:39

LoSciamano

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2 Comments

Débora Over a year ago

Thanks. Would you let me know how to use -Xmx if my application is opened double clicking the .jar ? (not run in cmd)

LoSciamano Over a year ago

You can take a look at this question. stackoverflow.com/questions/1018217/…

Stephen C · Accepted Answer · 2011-11-10 09:39:51Z

1

The simple solution is to use the -Xmx JVM option to increase the heap size. However, there is a limit to how often / how much you can do that.

If you are already using an unacceptably large amount of memory, you will need to look at the way that you are generating the report. In particular, you may need to split it the report into smaller ones.

answered Nov 10, 2011 at 9:39

Stephen C

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1 Comment

Débora Over a year ago

Thank you very much for your info. I m still, would you let me know how to split the report? Also I want to run my jar when it double clicked. then where and how to use Xmx ?

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