Grails JFreeChart无法解析类：org.jfree.chart.ChartFactory

我正在运行一个程序，使用JFreeChart库和Groovy/Grails后端绘制折线图。这是我的密码：

    package com.xyz.jfreechartdemo

    import org.jfree.chart.ChartFactory
    import org.jfree.chart.JFreeChart
    import org.jfree.chart.plot.PlotOrientation
    import org.jfree.data.category.DefaultCategoryDataset

    class JFreeChartSample {
      def getChart(){
      def dataset = createDataset()
      def chart = createChart(dataset)
      return chart
    }

    def createDataset() {
       DefaultCategoryDataset dataset = new DefaultCategoryDataset()
      dataset.addValue(2000,"X",1)
      dataset.addValue(3300,"X",2)
      dataset.addValue(2000,"X",3)
      dataset.addValue(3300,"X",4)
      return dataset
    }

   def createChart(dataset){
    JFreeChart chart = ChartFactory.createLineChart("Widget not rendered","X","Count",dataset,PlotOrientation.VERTICAL,false,true,false)
    return chart
  }
}

我正在研究IntelliJ Idea 13.1.3。汇编成功。但我在运行程序时看到的是：

Compilation error: startup failed:
C:\Users\User\IdeaProjects\JFreeChartDemo\grails app\domain\com\xyz\jfreechartdemo\JFreeChartSample.groovy: 3: unable to resolve class org.jfree.chart.ChartFactory
 @ line 3, column 1.
   import org.jfree.chart.ChartFactory
   ^

C:\Users\User\IdeaProjects\JFreeChartDemo\grails-app\domain\com\xyz\jfreechartdemo\JFreeChartSample.groovy: 6: unable to resolve class org.jfree.data.category.DefaultCategoryDataset
 @ line 6, column 1.
   import org.jfree.data.category.DefaultCategoryDataset
    ^

C:\Users\User\IdeaProjects\JFreeChartDemo\grails-app\domain\com\xyz\jfreechartdemo\JFreeChartSample.groovy: 5: unable to resolve class org.jfree.chart.plot.PlotOrientation
 @ line 5, column 1.
   import org.jfree.chart.plot.PlotOrientation
  ^

C:\Users\User\IdeaProjects\JFreeChartDemo\grails-app\domain\com\xyz\jfreechartdemo\JFreeChartSample.groovy: 4: unable to resolve class org.jfree.chart.JFreeChart
 @ line 4, column 1.
   import org.jfree.chart.JFreeChart
   ^

4 errors

---

我已经将JCommon和所有JFreeChart库复制到lib文件夹中。我仍然看到这个错误。请帮忙。我对Groovy和Grails非常陌生。

添加代码的步骤：

添加jar依赖项，该依赖项将在BuildConfig.groovy中下载（您需要通过在线搜索jar版本，找到如何使用maven repository下载它）

运行“grails clean”

运行“grails刷新依赖项”