jasper reports - Error filling print... java.lang.String cannot be cast to java.lang.Number -


i trying sample report. connected database successfully.

i wrote simple query

select country, population dataset 
desc dataset;   | country    | varchar(25) | yes  |     | null    |       |  | population | int(9)      | yes  |     | null    |       |

i have taken blank chart , in used xy line chart. x-axis have given country , y-axis population. when click preview button, getting below error.

error filling print... java.lang.string cannot be cast to java.lang.number  java.lang.classcastexception: java.lang.string cannot be cast to java.lang.number at net.sf.jasperreports.charts.fill.jrfillxyseries.evaluate(jrfillxyseries.java:159)      at net.sf.jasperreports.charts.fill.jrfillxydataset.customevaluate(jrfillxydataset.java:121)     at net.sf.jasperreports.engine.fill.jrfillelementdataset.evaluate(jrfillelementdataset.java:155)      at net.sf.jasperreports.engine.fill.jrcalculator.calculatevariables(jrcalculator.java:160)      at net.sf.jasperreports.engine.fill.jrverticalfiller.filldetail(jrverticalfiller.java:765)      at net.sf.jasperreports.engine.fill.jrverticalfiller.fillreportstart(jrverticalfiller.java:288)      at net.sf.jasperreports.engine.fill.jrverticalfiller.fillreport(jrverticalfiller.java:151)      at net.sf.jasperreports.engine.fill.jrbasefiller.fill(jrbasefiller.java:909)      at net.sf.jasperreports.engine.fill.jrbasefiller.fill(jrbasefiller.java:822)      at net.sf.jasperreports.engine.fill.jrfiller.fill(jrfiller.java:61)      at net.sf.jasperreports.engine.jasperfillmanager.fill(jasperfillmanager.java:446)      at net.sf.jasperreports.engine.jasperfillmanager.fill(jasperfillmanager.java:276)      at net.sf.jasperreports.engine.jasperfillmanager.fillreport(jasperfillmanager.java:745)      at com.jaspersoft.ireport.designer.compiler.ireportcompiler.run(ireportcompiler.java:891)      at org.openide.util.requestprocessor$task.run(requestprocessor.java:572)      at org.openide.util.requestprocessor$processor.run(requestprocessor.java:997)  print not filled. try use emptydatasource...

please me.

i think need standard line chart not xy line chart.

xy line charts need categories (in case country) , (x,y) point.


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