BIRT How to use script dataSorce and POJO dataSet

Migrateduser

<p>I'm trying birt to generate report from script dataSorce and POJO dataSet</p>
<p>I followed this tutorial :  <a data-ipb='nomediaparse' href='http://www.vogella.com/tutorials/EclipseBIRT/article.html'>http://www.vogella.com/tutorials/EclipseBIRT/article.html</a></p&gt;
<p>And i have done all steps but when i click on Data Set --> Edit --> Preview Results， I got nothing .</p>
<p>Please offer some help and see what's going wrong.</p>