title: How to get parameter value in Jasper chart customizer?
body: <p>Is it possible to get parameter values (passed into fillReport method of JasperFillManager) in ChartCustomizer?</p>
  
  <p>Example:</p>
  
  <pre><code>Map&lt;String, Object&gt; params = new HashMap&lt;String, Object&gt;();
  params.put("SOME_PARAM", "some string");
  
  JasperPrint jp = JasperFillManager.fillReport(jr, params, dataSource);
  </code></pre>
  
  <p>Then in customize function paramValue always null:</p>
  
  <pre><code>public void customize(JFreeChart freeChart, JRChart jasperChart) {
    String paramValue = (String)getParameterValue("SOME_PARAM"); // always null
  }
  </code></pre>
  
  <p>Expected result: <code>paramValue</code> equals to <code>"some string"</code>;</p>
  
  <p>Actual result: <code>paramValue</code> equals to <code>null</code>.</p>