I'm using Webshere 5.1 on OS400 V5R2 and I've encountered the same error message : net.sf.jasperreports.engine.JRRuntimeException: java.lang.VerifyError: org/jfree/chart/renderer/AbstractRenderer 0000 0000.
I've changed JFreeChart jar file from 1.0.9 to 1.0.8a and...it works !
