Java Eclipse和jasper報告：如何定位log4j.properties？

我總是得到一個錯誤這個Java Eclipse和jasper報告：如何定位log4j.properties？

log4j:WARN No appenders could be found for logger (net.sf.jasperreports.engine.xml.JRXmlDigesterFactory). log4j:WARN Please initialize the log4j system properly.

我不知道哪裏是log4j.properties是。它是可下載的嗎？因爲我目前有zip包名爲 jasperreports-4.7.0，那裏有那麼多的圖書館，但哪一個呢？請幫幫我。我沒有運氣在谷歌找到它。我有方法，顯示我的數據庫

pubic void btnIreport(){

try{ 
    JasperDesign jd = JRXmlLoader.load("C:\\Users\\Nickz08\\Desktop\\test.jrpxml"); 
    String sql = "select * from tblStudentAccount order by name"; 
    JRDesignQuery newQuery = new JRDesignQuery(); 
    newQuery.setText(sql); 
    jd.setQuery(newQuery); 
    JasperReport jr = JasperCompileManager.compileReport(jd); 
    JasperPrint jp = JasperFillManager.fillReport(jr, null,conn); 
    JasperViewer.viewReport(jp); 

}catch(Exception e){ 
    e.printStackTrace(); 

}}

來源

2013-12-23 user3053928