Hi, When Iam trying to Launch JasperViewer from web browser , the applet successfully loading into browser and showing JasperViewer but not fetching report data. The applet showing below error. Exception in thread "AWT-EventQueue-2" java.lang.NoClassDefFoundError: Could not initialize class net.sf.jasperreports.components.ComponentsExtensionsRegistryFactory. I've placed below four jar files under WEB-INF/lib and applet folder( for codebase) jasperreports-4.5.1.jar, jasperreports-applet-4.5.1.jar, commons-collections-2.1.1.jar, commons-logging-1.1.1.jar Thanks & Regards, Eshwar.