To ensure the designer runs correctly on modern systems, follow these requirements:
Jaspersoft iReport Designer 4.0.1 is a legacy visual report design tool used to create templates for the JasperReports Library. While it was officially replaced by Jaspersoft Studio in 2015, many developers still require version 4.0.1 to maintain older "pixel-perfect" reports. Download Options for iReport Designer 4.0.1 jaspersoft ireport designer 4.0.1 download
Improved CSV datasource support and new namespace-aware query executors. To ensure the designer runs correctly on modern
Released in 2011, version 4.0.1 introduced several critical stability fixes and expanded data source support: Released in 2011, version 4
iReport 4.0.1 requires JDK 1.5 or 1.6 . It is notoriously incompatible with Java 8 or higher.
If the application fails to launch, edit the ireport.conf file located in the /etc folder of your installation and manually set the jdkhome path to your JDK 1.6 directory.