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iReport Barcode Generation Guide | Barcode Generation in iReport and Jasper Reports

Java Barcode supports embeding barcodes in iReport and Jasper Reports reporting solutions for Java developer.

Java Barcode Generator - Generate barcodes in iReport

Add barcode.jar to your report classpath.

Goto menu "Tools" > "Options" > "classpath" tab.
Add an image item to the report
Close the form to ask you select an image file.
Set image properties

Set "Expression Class" to "net.sf.jasperreports.engine.JRRenderable";

Set "Image Expression" to "new com.keepdynamic.barcode.generator.jasperreports.BarcodeRenderer(com.keepdynamic.barcode.generator.jasperreports.BarcodeFactory.createLinear(8, "123456789"))";
You can insert a Code 128 barcode into your report
If barcode value is getting from database, define your data field, and replace the barcode value "123456789" with $F{DataFieldName}.

iReport Barcode complete list of supported barcode symbologies: