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2014-6-11 15:19:33 org.apache.catalina.core.StandardWrapperValve invoke

严重: Servlet.service() for servlet servlet threw exception

java.lang.StackOverflowError

at Pojo.News.getNum(News.java:51)

at Pojo.News.getNum(News.java:51)

at Pojo.News.getNum(News.java:51)

这个是什么错误啊，求大神们指教，一调用 //NewsDao.addNews(n);就报错

servlet中dopost代码：s=request.getParameter("ok");

if("ok".equals(s)){

System.out.println("ok");

//new String(request.getParameter("Writer").getBytes("ISO-8859-1"), "utf-8")

String title=new String(request.getParameter("title").getBytes("ISO-8859-1"), "utf-8");

//System.out.println(title);

String plate=new String(request.getParameter("select").getBytes("ISO-8859-1"), "utf-8")

String text=new String(request.getParameter("text").getBytes("ISO-8859-1"), "utf-8")

SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd");

String date=df.format(new Date()).toString()

String num="20111681";//(String)request.getAttribute("num")

String source="20111681";//(String)request.getAttribute("num")

String id=NewsDao.setId();

News n=new News( id, plate, title, date, source, text, num)

//NewsDao.addNews(n);

response.sendRedirect("NewsListInControl.jsp");

}

addNews()代码：

public static int addNews(News news)

{

SQLHelper help=new SQLHelper();

String plate=news.getPlate();

String title=news.getTitle();

String date=news.getDate();

String source=news.getSource();

String text=news.getText();

String id=news.getId();

String num=news.getNum();

String sql="insert into news values('"+num+"','"+title+"','"+date+"','"+source+"','"+text+"','"+id+"','"+num+"');"

int n=help.executeUpdate(sql)

return n;

}

getnum代码：public String getNum(){

return this.getNum();

}