请教各位高手jfreechart异常该如何解决

我用jfreechart 做了个K线图，可是放在weblogic下运行时，图片能正常显示，可是后台报如下错误！请问有哪位知道这是怎么回事啊？sun.dc.pr.PRException: endPath: bad path
at sun.dc.pr.Rasterizer.endPath(Rasterizer.java:535)
at sun.java2d.pipe.DuctusRenderer.createShapeRasterizer(DuctusRenderer.java:291)
at sun.java2d.pipe.DuctusShapeRenderer.renderPath(DuctusShapeRenderer.java:54)
at sun.java2d.pipe.DuctusShapeRenderer.fill(DuctusShapeRenderer.java:47)
at sun.java2d.pipe.ValidatePipe.fill(ValidatePipe.java:110)
at sun.java2d.SunGraphics2D.fill(SunGraphics2D.java:1611)
at org.jfree.chart.renderer.xy.CandlestickRenderer.drawItem(CandlestickRenderer.java:793)
at org.jfree.chart.plot.XYPlot.render(XYPlot.java:3717)
at org.jfree.chart.plot.XYPlot.draw(XYPlot.java:3255)
at org.jfree.chart.plot.CombinedDomainXYPlot.draw(CombinedDomainXYPlot.java:466)
at org.jfree.chart.JFreeChart.draw(JFreeChart.java:1230)
at org.jfree.chart.JFreeChart.createBufferedImage(JFreeChart.java:1404)
at org.jfree.chart.JFreeChart.createBufferedImage(JFreeChart.java:1384)
at org.jfree.chart.ChartUtilities.writeChartAsPNG(ChartUtilities.java:183)
at org.jfree.chart.ChartUtilities.saveChartAsPNG(ChartUtilities.java:320)
at org.jfree.chart.servlet.ServletUtilities.saveChartAsPNG(ServletUtilities.java:187)
at jsp_servlet._wip.__spckline._jspService(__spckline.java:479)
at weblogic.servlet.jsp.JspBase.service(JspBase.java:27)
at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:262)
at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:198)
at weblogic.servlet.internal.WebAppServletContext.invokeServlet(WebAppServletContext.java:2637)
at weblogic.servlet.internal.ServletRequestImpl.execute(ServletRequestImpl.java:2359)
at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:139)
at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:120)