用jasperreport制作报表时出现错误java.lang.IllegalAccessError

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用jasperreport制作报表时出现错误java.lang.IllegalAccessError5

各位大侠：你们好
               由于最近在开发一个系统，由于里面报表很多，打算使用ireport开开发报表。最近一直在研究。现在被一个错误给拦截了，弄了一天多没搞定，希望在这里能得到指导。
               错误如下：
              嚴重的: Servlet.service() for servlet testJasper threw exception
java.lang.IllegalAccessError: tried to access method jxl.write.biff.WritableFontRecord.setStruckout(Z)V from class net.sf.jasperreports.engine.export.JExcelApiExporter
at net.sf.jasperreports.engine.export.JExcelApiExporter.getLoadedFont(JExcelApiExporter.java:1210)
at net.sf.jasperreports.engine.export.JExcelApiExporter.addBlankCell(JExcelApiExporter.java:314)
at net.sf.jasperreports.engine.export.JRXlsAbstractExporter.exportPage(JRXlsAbstractExporter.java:574)
at net.sf.jasperreports.engine.export.JRXlsAbstractExporter.exportReportToStream(JRXlsAbstractExporter.java:434)
at net.sf.jasperreports.engine.export.JRXlsAbstractExporter.exportReport(JRXlsAbstractExporter.java:197)
at japconnect.BaseExcelExport.export(BaseExcelExport.java:142)
at test.testJasper.doGet(testJasper.java:72)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:286)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:845)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
at java.lang.Thread.run(Thread.java:619)
我运行的环境是jdk1.6，tomcat6.0。我通过网上介绍说是由于版本的原因，我就到网上下了最新的jxl包，结果还是一样。希望在这里能得到指教。多谢！

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