hello i m getting following error while creating a simple line chart : Exception in component tLineChart_1 org.jfree.data.general.SeriesException: X-value already exists. at org.jfree.data.xy.XYSeries.add(XYSeries.java:363) at org.jfree.data.xy.XYSeries.add(XYSeries.java:324) at org.jfree.data.xy.XYSeries.add(XYSeries.java:305) at local_project.line_0_1.line.tMysqlInput_1Process(line.java:1038) at local_project.line_0_1.line.runJobInTOS(line.java:1395) at local_project.line_0_1.line.main(line.java:1252)